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	Early IBM disk storage - Definition, explanation
		The IBM 350 was part of the IBM RAMAC 305, the computer that introduced disk storage technology to the world on September 4, 1956.
		A major advance over the IBM 350 and IBM 1405 was the use of a separate arm and head for each recording surface, with all the arms moving in and out together like a big comb.
		IBM needed a way to load new microcode into the 370 and developed the floppy disk for this purpose.
	www.calsky.com /lexikon/en/txt/e/ea/early_ibm_disk_storage.php (1963 words)

	Disk storage Summary
		Disk storage refers to a broad range of devices in which information is placed on disks in digital form (more specifically, as bits that consist of the binary digits "1" and "0").
		A couple of the most common are floppy disks, which are inserted into a floppy disk drive, and called "floppies" because their disks are flexible; and removable cartridges, which have a hard outer shell encasing a rigid magnetic disk (or disks).
		Disk storage is a group of data storage mechanisms for computers; data are transferred to planar surfaces or disks for temporary or permanent storage.
	www.bookrags.com /Disk_storage (2558 words)

	Disk storage (Linux Reviews)
		Disk storage is a general category of a computer storage mechanisms, in which data is recorded on planar, round and rotating surfaces (disks, discs, or platters).
		Then the scientists at IBM in San Jose, California created a rotating drum that was coated in a magnetically polarizable film that could be used to store data by changing and sensing magnetic polarization.
		The random-access, low-density storage of disks was developed to complement the already used sequential-access high-density storage provided by magnetic tape.
	linuxreviews.org /dictionary/Disk_storage (654 words)

	The Innovator's Dilemma
		Although most of IBM's competitors in computers (for example, Control Data, Burroughs, and Univac) were integrated vertically into the manufacture of their own disk drives, the emergence in the 1970s of smaller, nonintegrated computer makers such as Nixdorf, Wang, and Prime spawned an original equipment market (OEM) for disk drives as well.
		The first curve plots the density of drives that used conventional particulate oxide disk technology and ferrite head technology; the second charts the average density of drives that used new-technology thin-film heads and disks; the third marks the improvements in density achievable with the latest head technology, magneto-resistive heads.
		And their customers--in a way that was not apparent to either the disk drive manufacturers or their computer-making customers--were pulling them along a trajectory of 22 percent capacity growth in a 14-inch platform that would ultimately prove fatal.
	www.businessweek.com /chapter/christensen.htm (5891 words)

	IBM Archives: IBM 1301 disk storage unit
		The IBM 1301 Disk Storage Unit, with its larger capacity, flexibility and speed, greatly expanded the operational capability of the IBM 7000 series of computers (7070, 7094, 7080 and 7090).
		As a result, storage capacity per square inch of surface was increased 13 times over what it had been with IBM's RAMAC technology of 1956.
		According to IBM computer historian Dr. Emerson Pugh and his co-authors, "The 1301 pioneered in two major areas: self-acting, air-bearing slider technology and a separate read-write head for each disk surface with a comblike structure to hold the heads and move them in concert from one cylinder of data to the next.
	www-03.ibm.com /ibm/history/exhibits/storage/storage_1301.html (457 words)

	Computer History Museum - Timeline of Computer History
		The IBM 1301 Disk Drive was announced on June 2nd, 1961 for use with IBM’s 7000-series of mainframe computers.
		The disks would rotate at 1,500 RPM and were accessed by a hydraulic actuator with one head per disk.
		Using disks that included the read/write head inside them, the Bernoulli Box was a special type of disk drive that allowed people to move large files between computers when few alternatives (such as a network) existed.
	www.computerhistory.org /timeline/?category=stor (464 words)

	IBM System Storage News Feed
		IBM is introducing Tivoli Storage Manager (TSM) version 5.5, which offers a host of new features and functionality that are designed to introduce key improvements in data security, performance, functionality, and ease of use.
		IBM today announced a major new release for the IBM System Storageâ¢ DS8000â¢ Turbo series, IBM's flagship enterprise disk storage system, as well as a new storage console, which acts as the equivalent of a "universal remote control".
		IBM DS3300 entry-level disk array is a robust, reliable and cost-effective new solution designed to bring integrated storage management to the small and medium business.
	www.ibm.com /storage/storage.rss (732 words)

	Record Growth For External Disk Storage Systems - Technology News by TechWeb
		Factory revenue in the external disk storage systems market grew by 12.5 percent year-over-year to $3.9 billion in the third quarter of 2005, according to results announced Friday.
		The global market for disk storage systems grew 13.3 percent year over year to $5.7 billion during the third quarter of 2005, according to IDC.
		HP and IBM accounted for 19.1 and 12.9 percent of the revenue share, respectively.
	www.techweb.com /wire/174900873 (620 words)

	This is a 5MB Hard Disk \| Ah Boon.Net 阿文
		The IBM 350 Disk Storage Unit provides storage capacity of the disk drive was 5MB (referred to at the time as 5 million characters).
		With the cabinet covers on, the IBM 350 Disk Storage Unit measured 5’ 8” tall, 5’ wide and 2’ 5” deep, whilst it weighed in at massive 250kgs.
		I’ve had a harddisk in my hands, it was called a disk pack, that was really heavy and contained a number of platters that were at least as big as vinyl LP’s.
	ahboon.net /2007/01/05/this-is-a-5mb-hard-disk (500 words)

	Magnetic Disk Memory Commemorated with Milestone Award
		Before magnetic disk storage was developed, running programs on early computers required search through miles of magnetic tape or stacks of coded punch cards, looking for the right data.
		The story of magnetic disk storage began in 1952, when IBM Corp., based on the East Coast of the United States, in New York City, decided to set up a small research laboratory on the West Coast.
		IBM announced its new technology on 6 May 1955, and the first IBM RAMAC 305 system system with the 350 disk file hit the market more than a year later—on 4 September 1956.
	www.ieee.org /portal/site/tionline/menuitem.130a3558587d56e8fb2275875bac26c8/index.jsp?&pName=institute_level1_article&TheCat=2201&article=tionline/legacy/inst2005/may05/5w.fhistoryrama.xml& (557 words)

	Early IBM disk storage - Free net encyclopedia (Site not responding. Last check: )
		Image:BRL61-IBM 305 RAMAC.jpeg The IBM 350 was part of the IBM RAMAC 305, the computer that introduced disk storage technology to the world on September 4, 1956.
		The IBM 3330 DASD was the first disk drive to use voice coil motor technology to position the read/write heads over the tracks of data.
		IBM needed a way to load new microcode into the IBM System/370 Model 158 and developed the floppy disk for this purpose.
	www.netipedia.com /index.php/IBM_350 (2447 words)

	Hard disk - ExampleProblems.com
		The disk surface and the drive's internal environment must therefore be kept immaculately clean to prevent damage from fingerprints, hair, dust, smoke particles, etc. given the submicroscopic gap between the heads and disk.
		For many years, hard disks were large, cumbersome devices, more suited to use in the protected environment of a data center or large office than in a harsh industrial environment (due to their delicacy), or small office or home (due to their size and power consumption).
		Before the early 1980s, most hard disks had 8-inch or 14-inch platters, required an equipment rack or a large amount of floor space (especially the large removable-media drives, which were often referred to as "washing machines"), and in many cases needed special power hookups for the large motors they used.
	www.exampleproblems.com /wiki/index.php?title=Hard_disk&redirect=no (4018 words)

	The “Millipede”—More than one thousand tips for future AFM data storage
		The consequence for storage is that any new technique with better areal storage density than today's magnetic recording [1] should have long-term potential for further scaling, desirably down to the nanometer or even atomic scale.
		Conventional magnetic storage, however, operates at best on the nanosecond time scale, making it clear that AFM data rates have to be improved by at least three orders of magnitude to be competitive with current and future magnetic recording.
		A storage capacity of several terabits appears to be achievable on 2.5- and 3.5-in.
	www.research.ibm.com /journal/rd/443/vettiger.html (6501 words)

	EMC: About EMC: History: Story: Brief History
		EMC argued that the storage system didn’t need to look like an IBM disk drive system, it was only necessary that the computing processor "think" that it looked like one, i.e., receive data in the same format.
		Historically in storage systems, however, data was always written directly to the disks and was transferred to a small cache when it was read.
		Starting in the early 1970’s, IT followed a path of decentralization as computing power and its associated data storage migrated from the data center mainframe, to the departmental server and to the workstation and personal computer.
	www.emc.com /about/emc_story/brief_history.jsp (1914 words)

	Early_IBM_disk_storage - The Wordbook Encyclopedia (Site not responding. Last check: )
		The invention of magnetic disk storage, pioneered by IBM in the 1950s, was a critical component of the computer revolution.
		Disk drive performance and characteristics are measured the same today as they were in the 1950s.
		The IBM 2315 cartridge is notable as the first floppy disk; the disk within the hard plastic cartridge case was made from the same type of material as the later 8" and 5.25" diskettes.
	www.thewordbook.com /Early_IBM_disk_storage (2774 words)

	Technological impact of magnetic hard disk drives on storage systems
		Magnetic hard disk drives have undergone vast technological improvements since their introduction as storage devices over 45 years ago, and these improvements have had a marked influence on how disk drives are applied and what they can do.
		Although the fundamental architecture of disk drives has changed very little in the years since their introduction, the geometric size of drives has been reduced almost to the point of micro-miniaturization, and these smaller sizes have resulted in storage system characteristics that offer new horizons in data retention and availability.
		In the past, only eight large-form-factor disk drives could be contained within a storage system frame of reasonable size, whereas today's systems may contain as many as 256 drives (or more) in a RAID (redundant array of independent disks) or equivalent configuration.
	www.research.ibm.com /journal/sj/422/grochowski.html (2804 words)

	Early IBM disk storage - CompWisdom (Site not responding. Last check: )
		IBM - Refurbished computer and storage solutions for midrange and...
		IBM Computer Systems AS400, S/390, and Enterprise Storage Systems The IBM Enterprise Storage Server is a second-generation Seascape disk storage system that provides industry-leading...
		IBM Personal computing support - Tips to help you use your...
	www.compwisdom.com /topics/Early-IBM-disk-storage (247 words)

	IBM 305 RAMAC- The First Computer with a Hard Disk Drive in 1956
		IBM introduced the 305 RAMAC computer on September 13th, 1956, which was the first computer to include a disk drive named the IBM 350 Disk File.
		The magnetic disk was seen as a replacement for the magnetic drum for the same reason 78 RPM Records eventually replaced Edison cylinders- more storage with less space.
		The capacity of the entire disk file was 5 million 7-bit characters, which works out to about 4.4 MB in modern parlance.
	www.cedmagic.com /history/ibm-305-ramac.html (230 words)

	hard disk drive history
		The inner disk that holds the data usually is made of mylar and coated with a magnetic oxide, and the outer, plastic cover, bends easily.
		The inner disk of today's smaller, 3.5-inch floppies are similarly constructed, but they are housed in a rigid plastic case, which is much more durable than the flexible covering on the larger diskettes.
		The longer life of a hard drive is also a function of the disk drive's read/write head: in a hard disk drive, the heads do not contact the storage media, whereas in a floppy drive, the read/write head does contact the media, causing wear.
	www.fortunecity.com /marina/reach/435/storage.html (1575 words)

	Disk drives take eventful spin
		IBM Corp. was introducing a product that offered unprecedented random-access storage — 5 million characters (not bytes, they were 7-bit, not 8-bit characters).
		This first disk drive heralded startling leaps in mass-storage technology and the end of sequential storage on punched cards and paper or Mylar tape, though magnetic tape would continue for archival or backup storage.
		The disk drive, in fact, was a successor to the magnetic-drum drive, and both go back to the early '50s at Engineering Research Associates.
	www.disktrend.com /disk3.htm (2391 words)

	#90 IBM 350 RAMAC Disk File (1956) - Landmarks
		The IBM 350 disk drive storage development led to the breakthrough of on-line computer systems by providing the first storage device with random access to large volumes of data.
		Fifty disks stacked on a cantilevered, rotating spindle recorded in one hundred concentric tracks on each side of each disk, providing 5 million characters of data storage.
		Development of the disk drive was pioneered by IBM engineers in San Jose and led to IBM's first computer manufacturing plant in California.
	www.asme.org /Communities/History/Landmarks/IBM_350_RAMAC_Disk_File_1956.cfm (239 words)

	IBM Builds on 50 Years of Spinning Disk Storage
		The Disk Storage Unit was introduced on Sept. 4, 1956, and the 305 RAMAC Computer was introduced on Sept. 13, 1956.
		Storage Systems that Compute: Smart movement of computing power is enabled by LPAR (logical partition) technology, which allows virtual servers to be created on the storage server.
		IBM scientist Spike Naraya offered a detailed explanation of how data densities on tape continue to be improved by leaps and bounds each year.
	www.physorg.com /news77026229.html (1223 words)

	IBM info
		IBM and Cisco Wednesday announced a unified communications partnership and promised to deliver integration among their products including real-time clients and back-end servers, as well as an open-client framework for developers.
		IBM Wednesday said it was linking nearly 4,000 Google Gadgets to its WebSphere portal in a move that lets users create mash-ups between enterprise and Web-based services while maintaining it all under corporate security and management controls.
		It may be too early to talk plug-and-play but IBM believes it can help businesses of all sizes easily cluster their servers to handle intensive computing workloads.
	www.networkworld.com /news/financial/ibm.html (1345 words)

	[No title]
		Hard disk firmware is the information that is used by the computer that allows it to correctly interact with the hard disk.
		Partitioning a hard disk is the act of defining areas of the disk for an operating system to use as a volume.
		If the hard disk was fitted with a read-only head, which could start reading data for analysis while the read/write head was still writing data on the disk, analysis could be done faster.
	www.lycos.com /info/hard-disk--hard-disk-drive.html (500 words)

	What is floppy disk? - A Word Definition From the Webopedia Computer Dictionary
		Unlike most hard disks, floppy disks (often called floppies or diskettes) are portable, because you can remove them from a disk drive.
		Disk drives for floppy disks are called floppy drives.
		Floppy disks are slower to access than hard disks and have less storage capacity, but they are much less expensive.
	www.webopedia.com /TERM/f/floppy_disk.html (346 words)

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