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Computer Storage

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.

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Computer Storage

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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

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