From Cave Paintings to the Internet A Chronological and Thematic Database on the History of Information and Media Data Storage / Memory Timeline

The Royal Library of Alexandria is founded under the reign of Ptolemy I Soter or Ptolemy II.

At its peak the Alexandrian library may have preserved 400,000 to 700,000 papyrus rolls—the largest collection of recorded information in the ancient world. Though the number of papyrus rolls (scrolls) at Alexandria was undoubtedly very large,  especially relative to other libraries of its time, to keep the extent of this library in proportion one should remember that a typical papyrus roll probably contained a text about the length of one book of Homer.

Traditionally the Alexandrian Library is thought to have been based upon the library of Aristotle. By tradition it is also believed, without concrete evidence, that the much of the collection of rolls was acquired by order of Ptolemy III, who supposedly required all visitors to Alexandria to surrender rolls in their possession. These writings were then copied by official scribes, the originals were put into the Library, and the copies were delivered to the previous owners.

The Alexandrian Library was associated with a school and a museum. Scholars at Alexandria were responsible for the editing and standardization for many earlier Greek texts. One of the best-known of these editors was Aristophanes of Byzantium, a director of the library, whose work on the text of the Iliad may be preserved in the Venetus A manuscript, but who was also known for editing authors such as Pindar and Hesiod. (The Venetus A manuscript is noticed in this database.)

Though it is known that portions of the Alexandrian Library survived for several centuries, the various accounts of the library's eventual destruction are contradictory. The Wikipedia article on the Library of Alexandria outlines four possible scenarios for its destruction:

1. Julius Caesar's fire in The Alexandrian War, in 48 BCE
2. The attack of Aurelian in the Third century CE
3. The decree of Theophilus in 391 CE
4. The Muslim conquest in 642 CE or thereafter.

The article concludes that "although the actual circumstances and timing of the physical destruction of the Library remain uncertain, it is however clear that by the eighth century A.D., the Library was no longer a significant institution and had ceased to function in any important capacity."

♦ Another factor in the eventual destruction of the contents of the Alexandrian Library might have been the decay of the papyrus rolls as a result of the climate. Most of the papyrus rolls and fragments that survived after the Alexandrian Library did so in the dry sands of the Egyptian desert. Papyrus rolls do not keep well either in dampness or in salty sea air, to which they were likely exposed in the library located in the port of Alexandria. Thus, independently of the selected library destruction scenario, because of decay of the storage medium, or as a result of fires or other natural catastrophes, or neglect, it is probable that significant portions of the information in the Alexandrian library were lost before the library was physically destroyed.

Between about 150 and 450 CE the form of the manuscript book shifted from the roll to the codex. However, the transition was very gradual as most readers preferred the traditional roll format which had been in existence for over 2000 years. The transition may not have been "complete" until the fifth century.

"Ultimately, as its etymology indicates, the codex book evolved from wooden tablets, often with wax-filled compartments, used in ancient Rome for more or less ephemeral jottings and figurings. A group of such tablets, tied or hinged together, was known as a caudex / codex, a word originally indicating a tree trunk or block of wood (and, in Terence, a blockhead). At some stage before the Christian era folded parchments (membranae) came to be used for the same ephemeral purposes, and then were eventually adopted for permanent storage of written matter, even literary texts; and by the third century A.D. the term 'codex' had become assimilated also to these non-wooden objects" (Needham, Twelve Centuries of Bookbindings 400-1600 [1979] 4).

The gradual transition from the roll to the codex has often been credited to early Christians, who apparently did not feel bound by tradition, for they did not continue to use the papyrus roll like the classical Greeks and Romans, nor the parchment roll like the Jews. To write the books of the Bible the Christians used the codex to a greater and greater extent, first on papyrus and then on parchment. Some of the best examples of early Christian papyrus codices in single quire Coptic bindings are the Nag Hammadi Library discovered in 1945.

Though the papyrus roll continued to be used until at least the fifth century for pagan literature,

"this was strikingly not the case with Christian literature, and particularly the Christian Bible. Even its earliest surviving fragments, dating from the second century, whether written on parchment or papyrus, are ordinarily in codex form. It is not until the fourth century, at roughly the time the Empire became officially Christian, that the age of the codex was inaugurated for non-Christian literature. The question of why the codex book was apparently aboriginal to Christianity is an important and difficult one. The most profound student of the question, Mr. C. H. Roberts, has made the attractive suggestion that we see here a reflection of the Roman origin of Christian writing. Assuming that Mark's was the earliest of the gospels, and that, as tradition has it, it was written in Rome, Roberts has postulated that the codex format was brrowed from the notebooks and account books current in St. Mark's milieu, that of 'Jewish and gentile traders, small business men, freedmen or slaves,' and that the format then became general among the Christians, whose copies of the new writings were made outside the world of professional scribes and their standard roll-form. The implication is that the authority of the Word helped crystallize its form, leading to the retention of the codex format even, for instance in Egypt, where the commonest writing material, papyrus, was (being much less pliable than leather) not inherently suited to the new form" (Needham, op cit., 4).

Whether the Christians were responsible for the transition from the roll to the codex or they adopted it, the fourth century saw both the triumph of Christianity in the Roman Empire and a revolution in book production which made it possible to make books large enough to hold the whole Bible in one volume, and also to hold all of Virgil's poems in one volume. Christians preferred the codex format for the Scriptures used in liturgy since a codex is easier to handle than a roll, and one can write on both sides of the leaves of a codex, allowing more information to be recorded in less space. This was also a form of information storage preferable for people on the move. The codex also allowed the development of bindings which were protective as well as decorative. Bindings would have increased the longevity of codices versus scrolls, and over time this would have been recognized as a significant advantage.

During the transitional period, for first drafts, brief writings, and notes the Romans used various forms of bound parchment leaves. For diplomas and other brief documents they wrote on bronze, lead, and wood. They used erasable wax tablets for notes, and in certain cases sealed wax tablets for legal documents. For formal presentations they preferred the papyrus roll. Scribes preferred to write on the side of papyrus with the fibers running horizontally. When they wrote on the outside of the roll the writing on the outside was easily worn off. One of the limitations of papyrus rolls was that an individual roll could hold a text only about the length of one book of Homer.

The Bellicorum instrumentorum liber, cum figuris et fictitys litoris conscriptus,written and drawn by the Italian engineer, self-styled magus, and physician to the Venetian army in Brescia, Giovanni Fontana may be the earliest extant illustrated Italian manuscript on technology and war machines.

Fontana accompanied each of his roughly 140 illustrations of siege engines, fountains and pumps, lifting and transporting machines, defensive towers, dredges, combination locks, battering rams, a "rocket-powered" craft, the first ever depiction of the magic lantern, scaling ladders, alchemical furnaces, clockwork, robotic automata, and measuring instruments with a caption that was partially encoded with a substitute cypher system.

♦ You can view a digital facsimile of Fontana's manuscript at the Bayerische Staatsbibliothek website at this link: http://daten.digitale-sammlungen.de/~db/0001/bsb00013084/images/index.html?id=00013084&fip=67.164.64.97&no=4&seite=21, accessed 01-16-2010).

Another manuscript by Fontana, preserved in the Bibliothèque nationale de France (Nouvelles Acquisitions Latin 635), entitled Secretum de thesauro experimentorum ymaginationis hominum, concerned mnemonic devices and memory: 

"The entire manuscript, excepting the table of contents, title and concluding formula is in cipher; this consists  almost entirely of straight lines and circles. Abbreviation marks are  placed under the script. . . .

"where one sees several projects of combiantorial machines, concentric disks, cylinders, rolls that allow the permutation of isolated elements of writing (letters or words): and engineer's realization of the Lullian dream. However the connection between the theater in the first book and the devices of the second is not one of mere juxtaposition: the Secretum is actually a treatise of mnemotechnics, or, as Battisti put it, "the blueprint for a compact database of the mind (http://www.voynich.net/Arch/2002/09/msg00136.html, accessed 01-16-2010).

In his treatise De laude scriptorum (In Praise of Scribes) probably written in reaction to the information revolution caused by printing, Benedictine abbot Johannes Trithemius (Tritheim) advocated preserving the medieval tradition of manuscript copying even though he was well aware of the advantages of printing for information distribution, since thirty printed editions of his own writings appeared during the 15th century. Tritheim also questioned the durability of media used in long term information storage when he compared the known long-term durability of information written on traditional parchment , examples of which had already lasted over 700 years, with that written or printed on the newer and less proven medium of paper. He also pointed out that

"the entire written heritage could never be completely published in print or collected in a single library. Therefore, the preservation of less well-known works was to be the task of monks who could choose the texts to be copied without economic considerations and, working manually, reproduced them in higher quality than that of printed productions which often neglected the orthography and other decorative elements (ceteros librorum ornatus) — a not unjustified criticism of the hasty methods of mass production" (Wagner, Als die Lettern laufen lernten. Medienwandel im 15. Jahrhundert [2009] no. 32).

Perhaps not surprisingly, Tritheim's retrograde treatise which took issue with the new technology was not a best-seller. It underwent only one printed edition during the 15th century. ISTC no. it00442000.

♦ You can view a digital facsimile of this work at the Bayerische Staatsbibliothek website at this link: http://daten.digitale-sammlungen.de/~db/0003/bsb00037424/images/index.html?id=00037424&fip=67.164.64.97&no=3&seite=3, accessed 01-02-2010.

A painting by Pieter Breughel the Younger, of which one copy dated 1621 entitled the Village Lawyer is in the Museum voor Schone Kunster, Ghent, Belgium, and another copy dated 1620-40, and entitled Paying the Tax is in the Armand Hammer collection at the University of Southern California Fisher Museum of Art, perhaps caricatures the way paper accounting or legal records were maintained at the time. Records are shown in piles of bundles on tables, in bundles on shelves, in what appears to be sacks of bundles hanging on walls, in sheets of paper bundled together that may be tacked up on walls, and in piles on the floor. In short the methods of organizing and storing information appear sloppy, inefficient, and possibly chaotic.

Joseph-Marie Jacquard receives a patent for the automatic loom, which he invented in 1801.

The Jacquard loom uses punched cards to store patterns, and reduces strenuous manual labor.

In 1806 Jacquard's loom was declared public property, and Jacquard received a pension. However, he was forced to flee from Lyon because of the anger of the weavers, who feared they would lose their jobs to the new technology. Jacquard persevered, and by the time of his death there were thirty thousand Jacquard looms installed in Lyon alone.

Although the Jacquard loom does no computation, and is not a digital device, it is considered an important conceptual step in the history of computing, as the Jacquard method of storing information in punched cards, and following a series of instructions using a train of punched cards, was used by Charles Babbage in his plans for data and program input, and data output and storage for his Analytical Engine.

German physician and physiologist Carl Friedrich Wilhem Ludwig publishes "Beiträge zur Kenntniss des Einflusses der Respirationsbewegungen auf den Blutlauf im Aortensysteme" in Archiv für Anatomie, Physiologie und wissenschaftliche Medizin (1847) 242-302.

This was the Ludwig's first description of his kymograph, the first instrument to record scientific information in graphic form in real time, which Ludwig created by modifying Poiseuille’s hemodynamometer so that it could record its results graphically. This device, further modified by Marey and Chaveau, became a standard tool for the graphic recording of experimental results; it is illustrated in Ludwig's plated numbered 10 in the journal volume. 

Ludwig's paper was accompanied by 5 plates showing the apparatus and its method of graphic recording on a metal drum covered with smoked paper which was scratched with a moving stylus, leaving smoke-free lines. These paper sheets were then removed from the drum and fixed with varnish to preserve the record.

J. Norman (ed). Morton's Medical Bibliography 5th ed (1991) no. 770.

The use of flong for stereotype printing plates provides an advantage for the publication of mathematical tables since stereotype plates represent “an immutable form of information capture that offered immunity from the inherent vulnerability of moveable type to derangement during printing or storage” (Doron Swade, “The ‘Unerring Certainty of Mechanical Agency’: Machines and Table Making in the Nineteenth Century,” Campbell-Kelly [ed.] The History of Mathematical Tables [2003] 148).

Pres Eckert submits a report entitled Disclosure of Magnetic Calculating Machine, which briefly describes means for storing data on magnetic disks and also the storing of programs on disks. It does not enunciate the principles of the stored-program computer.

Pres Eckert lectures at University of Pennsylvania's Moore School on “A preview of a digital computing machine.” He proposes replacing  the three different kinds of memory used in the ENIAC (flip-flops in accumulators, function tables [read-only memory] and interconnecting cables with switches) with a single erasable high-speed memory --  the mercury delay-line memory that he invented for this purpose. The was a key step in the development of a stored-program computer.

Pres Eckert and John Mauchly's Electronic Control Company, the world's first electronic computer company, obtains a grant of $75,000 from the National Bureau of Standards for a research project involving Eckert's mercury delay line memory system and tape input/output devices. "With the prospect of receiving some money," the company rented their first offices at 1215 Walnut Street in Philadelphia and begins to hire employees.

The ENIAC is converted into an elementary stored-program computer via the use of function tables.

Hungarian physicist Dennis Gabor invents holography.

"Holography is a technique that allows the light scattered from an object to be recorded and later reconstructed so that it appears as if the object is in the same position relative to the recording medium as it was when recorded. The image changes as the position and orientation of the viewing system changes in exactly the same way as if the object was still present, thus making the recorded image (hologram) appear three dimensional. Holograms can also be made using other types of waves. The technique of holography can also be used to optically store, retrieve, and process information. While holography is commonly used to display static 3-D pictures, it is not yet possible to generate arbitrary scenes by a holographic volumetric display" (Wikipedia article on holography, accessed 04-26-2009).

Northrop Aviation places the contract for the BINAC (BINary Automatic Computer) with Pres Eckert and John Mauchly’s Electronic Control Company. The BINAC consisted of two identical serial computers operating in parallel with mercury delay-line memory, and magnetic tape as a secondary memory and auxiliary input device.

Pres Eckert and John Mauchly apply for a U.S. patent on the mercury acoustic delay-line electronic memory system. This was the "first device to gain widespread acceptance as a reliable computer memory system." (Hook & Norman, Origins of Cyberspace [2002] 1191). The patent 2,629,827 was granted in 1953.

Andrew D. Booth creates a magnetic drum memory, two inches long and two inches wide and capable of holding 10 bits per inch.

Booth offered his magnetic memory units for sale in 1952.

Three-dimensional magnetic-core memory replaces electrostatic memory on the Whirlwind I, leading to increased performance and reliability.

Louis N. Ridenour, Ralph R. Shaw, and Albert G. Hill publish a thin volume entitled Bibliography in an Age of Science.

This book published three lectures delivered at the University of Illinois the previous year. Though it was preceded by journal articles and technical reports, this may be the first separately published book to address the problems of applying new technologies to the searching and storage of printed information in libraries.

Shaw's article includes illustrations on pp. 60-61 of the Rapid Selector prototype which was in operation at this time. This machine, which applied the ideas of Emanuel Goldberg and the Memex idea of Vannevar Bush, stored 72,000 frames of information on a 2,000 foot reel of film. The prototype could search through the data at the rate of 78,000 "codes per minute." "Improvement of this searching speed to 120,000 codes per minute is now in sight."

Magnetic tape is used to record computer data on the Eckert-Mauchly UNIVAC I with its UNISERVO tape drive.

The UNISERVO was the first the tape drive for a commercially sold computer.

It's "recording medium was a thin metal strip of ½″ wide(12.7 mm) nickel-plated phosphor bronze. Recording density was 128 characters per inch (198 micrometre/character) on eight tracks at a linear speed of 100 in/s (2.54 m/s), yielding a data rate of 12,800 characters per second. Of the eight tracks, six were data, one was a parity track, and one was a clock, or timing track. Making allowance for the empty space between tape blocks, the actual transfer rate was around 7,200 characters per second. A small reel of mylar tape provided separation from the metal tape and the read/write head" (Wikipedia article on Univac I, accessed 04-26-2009).

Three-dimensional magnetic-core memory replaces electrostatic memory on the Whirlwind I, leading to increased performance and reliability.

"The 701 has at least 25 times the over-all speed but is less than one-quarter the size of IBM's Selective Sequence Electronic Calculator, which was dismantled to make room for its speedier successor."

"During its five-year reign as one of the world's best-known "electronic brains," the SSEC solved a wide variety of scientific and engineering problems, some involving many millions of sequential calculations. Such other projects as computing the positions of the moon for several hundred years and plotting the courses of the five outer planets -- with resulting corrections in astronomical tables which had been considered standard for many years -- won such popular acclaim for the SSEC that it stimulated the imaginations of pseudo-scientific fiction writers and served as an authentic setting for such motion pictures as "Walk East on Beacon," a spy-thriller with an FBI background.

"Though the 701 occupies the same quarters as the SSEC, which it rendered obsolete, it is not "built in" to the room as was its predecessor. Instead, it is smartly housed between serrated walls of soft-finished aluminum. A balconied conference room, overlooking the calculator and, separated from it by sloping plate glass, provides a vantage point for observing operations and discussing computations. Ample space is provided for writing the complex and abstract equations that are the stock in trade of engineers and scientists in an age of atomic energy and supersonic flight.

"The 701 uses all three of the most advanced electronic storage, or "memory" devices -- cathode ray tubes, magnetic drums and magnetic tapes. The computing unit uses small versions of the familiar electronic tubes, which are able to count at millions of pulses a second. In addition, several thousand germanium diodes are used in place of vacuum tubes, with resultant savings in space and power requirements.

"The 701 was designed for scientific and research purposes, and similar components are adaptable to the requirements of accounting and record-keeping. Research on commercial, data processing machines is under way.

"The 701 is capable of performing more than 16,000 addition or subtraction operations a second, and more than 2,000 multiplication or division operations a second. In solving a typical problem, the 701 performs an average of 14,000 mathematical operations a second."

(quotations from IBM's original press release from the IBM Archives website).

IBM develops magnetic core storage units, a dramatic improvement over cathode ray tube memory technology.

By successfully adapting pill-making machines for production, IBM greatly improved the manufacture of these tiny, “doughnut” shaped, iron oxide cores, making the cores reliable and cost effective enough to serve as the basic technology behind every computer’s main memory until the early 1970s.

IBM introduces the 650 RAMAC (Random Access Method of Accounting and Control) disk-storage system— a memory device based on rotating disks.

This was the first hard drive. It permitted random access to any of the million characters distributed over both sides of 50 two-foot-diameter disks. It stored about 2,000 bits of data per square inch and had a purchase price of about $10,000 per megabyte. By 1997 the cost of storing a megabyte on a hard drive dropped to around ten cents.

J.C.R. Licklider publishes Libraries of the Future, a study of what libraries may be at the end of the twentieth century.

Licklider's book reviewed systems for information storage, organization, and retrieval, use of computers in libraries, and library question-answering systems. In his discussion he was probably the first to raise general questions concerning the transition of the book from exclusively printing on paper to electronic form.

Maurice Wilkes introduces memory caching.

Semiconductor memory begins to replace magnetic-core memory.

Robert H. Dennard of IBM invents Dynamic Random Access Memory (DRAM) cells— one-transistor memory cells that store each single bit of information as an electrical charge in an electronic circuit. The technology permitted major increases in memory density.

Working at Bell Labs, Willard Boyle and George E. Smith invent the charge-coupled device (CCD), a sensor for recording images.

In 2009 Boyle and Smith shared half of the Nobel Prize in Physics "for the invention of an imaging semiconductor circuit – the CCD sensor." The Nobel Prize Committee prepared a report putting the discovery of the CCD in perspective. It may be accessed at http://nobelprize.org/nobel_prizes/physics/laureates/2009/phyadv09.pdf

"The lab [Bell Labs] was working on the picture phone and on the development of semiconductor bubble memory. Merging these two initiatives, Boyle and Smith conceived of the design of what they termed 'Charge "Bubble" Devices'. The essence of the design was the ability to transfer charge along the surface of a semiconductor. As the CCD started its life as a memory device, one could only "inject" charge into the device at an input register. However, it was immediately clear that the CCD could receive charge via the photoelectric effect and electronic images could be created. By 1969, Bell researchers were able to capture images with simple linear devices; thus the CCD was born. Several companies, including Fairchild Semiconductor, RCA and Texas Instruments, picked up on the invention and began development programs. Fairchild was the first with commercial devices and by 1974 had a linear 500 element device and a 2-D 100 x 100 pixel device. Under the leadership of Kazuo Iwama, Sony also started a big development effort on CCDs involving a significant investment. Eventually, Sony managed to mass produce CCDs for their camcorders. Before this happened, Iwama died in August 1982. Subsequently, a CCD chip was placed on his tombstone to acknowledge his contribution" (Wikipedia article on Charge-coupled device, accessed 10-06-2009).

Neil Armstrong, commander of the Apollo 11 lunar landing mission, and Edwin "Buzz" Aldrin, lunar module pilot, become the first human beings to walk on the moon.

Their landing was almost canceled in the final seconds because of an overload of the Apollo Guidance Computer’s memory, but on advice from Earth, they ignored the warnings and landed safely. The Apollo Guidance Computer was the first recognizably modern embedded system used in real-time by astronaut pilots.

Intel announces the Intel 1103, the world's first commercially available Dynamic Random Access Memory (DRAM) chip (1K bit pMOS dynamic RAM ICs).

IBM announces the System/370, an upgrade for the 360, using semiconductor memory in place of magnetic cores.

IBM introduces the first flexible magnetic storage diskette, or "floppy disk."

Phillips and Sony develop the compact disc (CD).

"Philips publicly demonstrated a prototype of an optical digital audio disc at a press conference called "Philips Introduce Compact Disc" in Eindhoven, The Netherlands on March 8, 1979. Three years earlier, Sony first publicly demonstrated an optical digital audio disc in September 1976. In September 1978, they demonstrated an optical digital audio disc with a 150 minute playing time, and with specifications of 44,056 Hz sampling rate, 16-bit linear resolution, cross-interleaved error correction code, that were similar to those of the Compact Disc introduced in 1982. Technical details of Sony's digital audio disc were presented during the 62nd AES Convention, held on March 13-16, 1979 in Brussels.

"The first test CD was pressed in Hannover, Germany by the Polydor Pressing Operations plant in 1981. The disc contained a recording of Richard Strauss's Eine Alpensinfonie, played by the Berlin Philharmonic and conducted by Herbert von Karajan. The first public demonstration was on the BBC TV show Tomorrow's World when The Bee Gees' 1981 album Living Eyes was played. In August 1982 the real pressing was ready to begin in the new factory, not far from the place where Emil Berliner had produced his first gramophone record 93 years earlier. By now, Deutsche Grammophon, Berliner's company and the publisher of the Strauss recording, had become a part of PolyGram. The first CD to be manufactured at the new factory was The Visitors by ABBA. The first album to be released on CD was Billy Joel's 52nd Street, that reached the market alongside Sony's CD player CDP-101 on October 1, 1982 in Japan. Early the following year on March 2, 1983 CD players and discs (16 titles from CBS Records) were released in the United States and other markets. This event is often seen as the "Big Bang" of the digital audio revolution. The new audio disc was enthusiastically received, especially in the early-adopting classical music and audiophile communities and its handling quality received particular praise. As the price of players sank rapidly, the CD began to gain popularity in the larger popular and rock music markets. The first artist to sell a million copies on CD was Dire Straits, with its 1985 album Brothers in Arms. The first major artist to have his entire catalogue converted to CD was David Bowie, whose 15 studio albums were made available by RCA Records in February 1985, along with four Greatest Hits albums. In 1988, 400 million CDs were manufactured by 50 pressing plants around the world. To date, the biggest selling CD (as opposed to the biggest selling title) is Beatles "1", released in November 2000, with worldwide sales of 30 million discs" I(Wikipedia article on Compact Disc, assessed 01-17-2010).

F. W. Lancaster , a professor of information science, publishes a book printed on paper entitled Toward Paperless Information Systems.

Fujio Masuoka, working at Toshiba, invents flash memory.

"According to Toshiba, the name "flash" was suggested by Dr. Masuoka's colleague, Mr. Shoji Ariizumi, because the erasure process of the memory contents reminded him of a flash of a camera. Dr. Masuoka presented the invention at the IEEE 1984 International Electron Devices Meeting (IEDM) held in San Francisco, California" (Wikipedia article on flash memory, accessed 04-01-2009).

IBM introduces the Scanmaster 1, a mainframe computer terminal designed to scan, transmit and store images of documents electronically.

To photograph, store, and organize the art work of the painter, Andrew Wyeth, Fred Mintzer, Henry Gladney and colleagues at IBM develop a high resolution digital camera for photographing art works and a PC-based database system to store and index the images. The system was used by Wyeth's staff to photograph, store, and organize about 10,000 images. "Pictures were scanned at a spatial resolution of 2500 by 3000 pixels and a color depth of 24 bits-per-pixel, and were color calibrated." This was the first digital image database of cultural materials.

DVD specification 1.0 is finalized.

The first DVD players and discs were available in November 1996 in Japan, in March 1997 in the United States. The first movie commercially released on DVD was Twister.

Michael Lesk attempts to calculate "How Much Information is There in the World?" He includes information on how much information a human brain may be able to retain.

How much information?, a project at the University of California at Berkeley by Peter Lyman and Hal R. Varian, attempts to measure the amount of information produced in the world each year.

"Heavy information overload: the world’s total yearly production of print, film, optical, and magnetic content would require roughly 1.5 billion gigabytes of storage. This is the equivalent of 250 megabytes per person for each man, woman, and child on earth.”

“Printed documents of all kinds comprise only .003% of the total. Magnetic storage is by far the largest medium for storing information and is the most rapidly growing, with shipped hard drive capacity doubling every year. Magnetic storage is rapidly becoming the universal medium for information storage.”

“Approximately 240 terabytes (compressed) of unique data are recorded on printed media worldwide each year.” The website provides a chart breaking down the printed media into categories.

The ASCI White supercomputer at the Lawrence Livermore National Laboratory in California is operational. An IBM system, it covers a space the size of two basketball courts and weighs 106 tons. It contains six trillion bytes (TB) of memory, almost 50,000 times greater than the average personal computer, and has more than 160 TB of Serial Disk System storage capacity—enough to hold six times the information stored in the 29 million books in the Library of Congress.

At the Bibliotheca Alexandrina Umberto Eco delivered a lecture entitled Vegetal and Mineral Memory: The Future of Books.

I quote from the beginning of the lecture:

"WE HAVE THREE TYPES OF MEMORY. The first one is organic, which is the memory made of flesh and blood and the one administrated by our brain. The second is mineral, and in this sense mankind has known two kinds of mineral memory: millennia ago, this was the memory represented by clay tablets and obelisks, pretty well known in this country, on which people carved their texts.

"However, this second type is also the electronic memory of today's computers, based upon silicon. We have also known another kind of memory, the vegetal one, the one represented by the first papyruses, again well known in this country, and then on books, made of paper. Let me disregard the fact that at a certain moment the vellum of the first codices were of an organic origin, and the fact that the first paper was made with rugs and not with wood. Let me speak for the sake of simplicity of vegetal memory in order to designate books.  

"This place has been in the past and will be in the future devoted to the conservation of books; thus, it is and will be a temple of vegetal memory. Libraries, over the centuries, have been the most important way of keeping our collective wisdom. They were and still are a sort of universal brain where we can retrieve what we have forgotten and what we still do not know.

"If you will allow me to use such a metaphor, a library is the best possible imitation, by human beings, of a divine mind, where the whole universe is viewed and understood at the same time. A person able to store in his or her mind the information provided by a great library would emulate in some way the mind of God. In other words, we have invented libraries because we know that we do not have divine powers, but we try to do our best to imitate them. To build, or better to rebuild, today one of the greatest libraries of the world might sound like a challenge, or a provocation. It happens frequently that in newspaper articles or academic papers some authors, facing the new computer and internet era, speak of the possible "death of books". However, if books are to disappear, as did the obelisks or the clay tablets of ancient civilisations, this would not be a good reason to abolish libraries. On the contrary, they should survive as museums conserving the finds of the past, in the same way as we conserve the Rosetta Stone in a museum because we are no longer accustomed to carving our documents on mineral surfaces.  

"Yet, my praise for libraries will be a little more optimistic. I belong to the people who still believe that printed books have a future and that all fears à propos of their disappearance are only the last example of other fears, or of milleniaristic terrors about the end of something, the world included. . . ."

"Current thinking about long-term memory in the cortex is focused on changes in the strengths of connections between neurons. But ongoing structural plasticity in the adult brain, including synapse formation/elimination and remodelling of axons and dendrites, suggests that memory could also depend on learning-induced changes in the cortical ‘wiring diagram’. Given that the cortex is sparsely connected, wiring plasticity could provide a substantial boost in storage capacity, although at a cost of more elaborate biological machinery and slower learning."

"The human brain consists of 10 to the 11th power neurons connected by 10 to the 15 power synapses. This awesome network has a remarkable capacity to translate experiences into vast numbers of memories, some of which can last an entire lifetime. These long-term memories survive surgical anaesthesia and epileptic episodes, and thus must involve modifications of neural circuits, most likely at synapses" (Chklovskii, Mel & K. Svoboda, "Cortical Rewiring and Information Storage," Nature, Vol. 431, 782-88).

The Center for Informatics Research in Science and Scholarship (CIRSS), formerly the Library Research Center (LRC), of the Graduate School of Library and Information Science at the University of Illinois at Urbana-Champaign, begins funding the Data Curation Education Program (DCEP).

"Data curation is the active and on-going management of data through its lifecycle of interest and usefulness to scholarly and educational activities across the sciences, social sciences, and the humanities. Data curation activities enable data discovery and retrieval, maintain data quality, add value, and provide for re-use over time. This new field includes representation, archiving, authentication, management, preservation, retrieval, and use. Our program offers a focus on data collection and management, knowledge representation, digital preservation and archiving, data standards, and policy, providing the theory and skills necessary to work directly with academic and industry researchers who need data curation expertise. To this end, DCEP has established a number of educational collaborations with premier science, social science, and humanities data centers across the country to prepare a new generation of library and information science professionals to curate materials from databases and other formats. We anticipate that our graduates will be employed across a range of information-oriented institutions, including museums, data centers, libraries, institutional repositories, archives, and private industry."

The program began with a focus on "data curation curriculum and best practices for the LIS and scientific communities. IMLS provided additional funding in 2008 to extend the curriculum to include humanities data" (Data Curation Education Program website, accessed 01-28-2009).

In the New York Times Magazine Kevin Kelly publishes Scan this Book! -- an account of current developments working toward the "universal" digital library on the Internet.

"From the days of Sumerian clay tablets till now, humans have "published" at least 32 million books, 750 million articles and essays, 25 million songs, 500 million images, 500,000 movies, 3 million videos, TV shows and short films and 100 billion public Web pages. All this material is currently contained in all the libraries and archives of the world. When fully digitized, the whole lot could be compressed (at current technological rates) onto 50 petabyte hard disks. Today you need a building about the size of a small-town library to house 50 petabytes. With tomorrow's technology, it will all fit onto your iPod. When that happens, the library of all libraries will ride in your purse or wallet — if it doesn't plug directly into your brain with thin white cords. Some people alive today are surely hoping that they die before such things happen, and others, mostly the young, want to know what's taking so long. (Could we get it up and running by next week? They have a history project due.)"

"Hitachi Global Storage Technologies is first to the mat with an announcement of a 1-terabyte hard disk drive. Industry analysts widely expected a 1TB drive to ship sometime in 2007; Hitachi grabbed a head start on the competition by announcing its drive today, just before the largest U.S. consumer electronics show starts next week.

"According to Hitachi, the drive ships in the first quarter of 2007, and will cost $399--less than the price of two individual 500GB hard drives today. The drive, called the Deskstar 7K1000, will be shown this weekend in Las Vegas at the 2007 International CES, also known as the Consumer Electronics Show, as well as at the Storage Visions storage conference" (http://www.pcworld.com/article/128400/hitachi_introduces_1terabyte_hard_drive.html, accessed 06-04-2009).

A new technology developed at Keio University carries with it the possibility that bacterial DNA could be used as a medium for storing digital information long-term—potentially thousands of years.

"Keio University Institute for Advanced Biosciences and Keio University Shonan Fujisawa Campus announced the development of the new technology, which creates an artificial DNA that carries up to more than 100 bits of data within the genome sequence, according to the JCN Newswire. The universities said they successfully encoded "e= mc2 1905!" -- Einstein's theory of relativity and the year he enunciated it -- on the common soil bacteria,  Bacillius subtilis."

According to an article in The New York Times entitled History Digitized (and Abridged), which points out that economic and copyright considerations require the digitization of library and archival collections to be very selective, the U.S. National Archives estimates that at the current rate of digitization of its 9 billion text records, it could take 1800 years to convert the paper text records in the National Archives to digital form.

According to the article referenced below, the entire archived content of the Internet occupies three petabytes (3 x 1000 terabytes) at this time. 

It is thought that one human brain may store roughly one petabyte. Though there may be some similarity in storage capacity between the quantity of information on the Internet and information stored in the human brain, quantity is the main point of similarity, since the information is stored and processed in totally different ways by people and computers.

Sandra Aamodt and Sam Wang, "Guest Column: Computers vs. Brains," New York Times Blogs, 03-31-2009.

"Regarding storage costs -- again its unhelpful to be vague, but equally unhelpful to be too specific. The cost of a 1 TB [terabyte] hard drive from the local IT hyperstore is NOT a useful number for estimating cost of reliable storage. Unfortunately the 'price of reliability' is equally hard to determine.

"The 'rule of thumb' most quoted now is 'one million dollars per year per petabyte' for 'managed server' storage eg disc-based storage from a well-run data centre that does good redundancy and backups. That means of course one thousand dollars per terabyte (per year) and that's a good estimate, in my view, to use for funding request and planning purposes. It can be done more cheaply -- up to ten times cheaper -- but that introduces various risks and requirements that you may or may not want to get into. In the BBC where we know that archive content is, on average, used once per four years, we're happy to put datatape on shelves and go for a much lower cost per terabyte" (Richard Wright, Sr Research Engineer, Research & Development, BBC Future Media & Technology, from: owner-dcc-associates@lists.ed.ac.uk, 06-04-2009).

"To promote the preservation and fuller use of data, The American Naturalist, Evolution, the Journal of Evolutionary Biology, Molecular Ecology, Heredity, and other key journals in evolution and ecology will soon introduce a new data‐archiving policy. The policy has been enacted by the Executive Councils of the societies owning or sponsoring the journals. For example, the policy of The American Naturalist will state:  

"This journal requires, as a condition for publication, that data supporting the results in the paper should be archived in an appropriate public archive, such as GenBank, TreeBASE, Dryad, or the Knowledge Network for Biocomplexity. Data are important products of the scientific enterprise, and they should be preserved and usable for decades in the future. Authors may elect to have the data publicly available at time of publication, or, if the technology of the archive allows, may opt to embargo access to the data for a period up to a year after publication. Exceptions may be granted at the discretion of the editor, especially for sensitive information such as human subject data or the location of endangered species.  

"This policy will be introduced approximately a year from now, after a period when authors are encouraged to voluntarily place their data in a public archive. Data that have an established standard repository, such as DNA sequences, should continue to be archived in the appropriate repository, such as GenBank. For more idiosyncratic data, the data can be placed in a more flexible digital data library such as the National Science Foundation–sponsored Dryad archive at http://datadryad.org"  (http://www.journals.uchicago.edu/doi/full/10.1086/650340, accessed 01-22-2010).