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Computer Storage

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16 diapositives · 304 Views · Sep 19, 2014

This article explores the evolution of magnetic storage technology from the 1950s through the early 2000s. It highlights key milestones, such as the introduction of the IBM 305 RAMAC in 1956, the emergence of removable disk packs, the first floppy disk in 1971, and advancements in hard drives. The timeline includes notable innovations like CD-ROM drives and Zip disks, culminating in the introduction of high-capacity disks and the need for advanced storage solutions like DAS, NAS, and SANs. Discover how magnetic storage has shaped modern computing.

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  1. 1953-early 1960’s • Drum divided into tracks • Each track has own read head – eliminating time to move heads • Controller just waits until sought data comes by • Speed of data storage/retrieval dependent on rotational speed. • Programmers wrote code onto drum in a particular fashion Computer Storage Brief History of Magnetic Storage

  2. Computer Storage Brief History of Magnetic Storage

  3. Computer Storage Brief History of Magnetic Storage IBM 305 RAMVAC – Introduced 1956

  4. 1965 – Removable disk Pack introduced Cassette tapes used for storage in early 1970’s 1971 -- First floppy disk (8”) introduced by IBM (100k) 1973 -- IBM introduces the IBM 3340 hard disk unit 1976 -- 5 ¼” first built – Single sided 180K 1978 -- 5 1/4 “ floppy did not become popular until Apple 2E in (Price for drive $495) 1980 – 3 1/2 “ floppy introduce by Sony 1987 - SEP. Microsoft ships Microsoft Bookshelf, its first CD-ROM application.  Computer Storage Brief History of Magnetic Storage

  5. Computer Storage 1990 - NOV. The Multimedia PC Marketing Council sets the minimum configuration required of a PC to run MPC-class software: 10-MHz 286 processor, 2MB RAM, 30MB hard drive, 16-color VGA, mouse, 8-bit audio card, 150KBps CD-ROM drive.  1991 - JUN. Tandy introduces its low-cost CDR-1000 CD-ROM drive for PCs. At US$400, including drive and controller card, it is about half the price of other drives. 1991 - Insite Technology begins shipping its 21 MB 3.5-inch floppy disk drive Brief History of Magnetic Storage

  6. Computer Storage 1993 - OCT. NEC Technologies unveils the first triple-speed (450KBps) CD-ROM drive. 1994 - JAN. NEC Technologies ships its quad-speed CD-ROM priced at US $1000.  1994 - DEC. Iomega Corp. introduces its Zip drive and Zip disks, floppy disk sized removable storage in sizes of 25MB or 100MB. Brief History of Magnetic Storage

  7. Computer Storage 1980 - Seagate Technologies announces the first Winchester 5.25-inch hard disk drive 1982 - Davong Systems introduces its 5MB Winchester Disk Drive for the IBM PC, for US $2000. 1983 IBM introduced the IBM PC/XT and hard disk drives also became standard on most personal computers. 1985 – Hard disks shrunk to 1.6” tall (still 5 ¼”) 1987 -- 3.5-inch form factor hard drives began to appear 1992 -- 1.8-inch form factor hard drives appeared, weighing only a few ounces and delivering capacities up to 40 MB 1997 - NOV. IBMannounced the world's highest capacity desktop PC hard disk drive with new breakthrough technology called Giant Magnetoresistive (GMR) heads. Brief History of Magnetic Storage

  8. Computer Storage 1999  - IBM introduces the 10,000 RPM Ultrastar 72ZX -- the world's highest capacity drive at 73 gigabytes (GB). 2000 - IBM announced the availability of the 1Gb Microdrive, the world's smallest, lightest and largest capacity mobile hard disk increasing storage by a factor of three.  Brief History of Magnetic Storage

  9. Computer Storage MFM(Modified Frequency Modulation) RLL (Run-Length-Limited) ESDI (Enhanced Small Device Interface or ESDI ) IDE (Intelligent Drive Electronics or Integrated Drive Electronics ) ATA (Advanced Technology Attachment ) SCSI (Small Computer System Interface) USB Firewire Fibre Channel ISCSI (Internet SCSI) INFINIBAND Interfaces

  10. Computer Storage How much hard disk storage is there in the world? Mass Storage Source: Raw data, various sources. Chart, How much information 2003

  11. Source: Many of these examples were taken from Roy Williams “Data Powers of Ten” web page at Caltech.

  12. How many are sold annually? Computer Storage Mass Storage Source: Raw data, various sources. Chart, How much information 2003

  13. For what usage? Computer Storage Mass Storage Source: Raw data, various sources. Chart, How much information 2003 Note that although the number server disks is only 10% of single-user disks, the capacity is about 347% times as much.

  14. Computer Storage It is estimated that 60% of this capacity is unused. Also note that these figures do not include tapes, CDs, DVDs, floppies, etc. Mass Storage

  15. So, where does this leave us? Computer Storage • The need for more storage. • Enter: • DAS • NAS • SANS • DAFS Mass Storage

  16. Computer Storage Coming soon: Feature attraction: The Protocols Starring: Fibre Channel FCIP iFCP And Introducing: ISCSI Mass Storage