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GRAP 3175 Computer Applications for Drafting Unit II Computer Hardware

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GRAP 3175 Computer Applications for Drafting Unit II Computer Hardware. Secondary Storage. Secondary Storage. Nonvolatile storage that is external to the main memory Used for: Storage of large amounts of data Permanent or long-term storage Backups Hardware is input/output (I/O) device.

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GRAP 3175 Computer Applications for Drafting Unit II Computer Hardware

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  1. GRAP 3175Computer Applications for DraftingUnit IIComputer Hardware

  2. Secondary Storage

  3. Secondary Storage • Nonvolatile storage that is external to the main memory • Used for: • Storage of large amounts of data • Permanent or long-term storage • Backups • Hardware is input/output (I/O) device

  4. Three Secondary Storage Media • Magnetic tape • Magnetic disks • Optical technology

  5. Three Main Characteristics • How much storage do you need? • Totals bytes • Density • How fast do you need it? • Data access time -- milliseconds • Data transfer rate -- megabytes per minute • How much will it cost? • Fixed cost • Cost per megabyte

  6. Local On-line Near-on-line Backup Archival Distribution Hard Disk Server-based magnetic & optical drives Optical jukeboxes & tape changers Tape drives & changers Tape drives & optical disk Floppy disks, recordable CR-ROMS, & magnetic tape Type of Storage Device

  7. Evaluation Criteria • Throughput (speed) -- transfer rate • Access time (delay) • Capacity • Drive cost • Media cost • Archival life

  8. On-line Near-on-line Backup Archival Distribution High throughput, fast access time & high capacity Very high capacity, low media cost, & long archival life High capacity & low drive cost Low media cost & long archival life High capacity & low media cost Type of Storage Criteria

  9. Magnetic Tape • 1/4”, 1/2”, 4mm, 8mm, or VHS • Tape drive (I/O) • Sequential Storage • Inexpensive -- backup storage

  10. Reel-to-reel Tape • 21MB - 170MB • Old technology -- slower access

  11. Cassette Tape • QIC -- Quarter inch cartridge (1/4”) • 2.5GB to 4GB • DAT -- Digital audio tape (4mm) • 20GB • DDS-3 -- Digital data storage (4mm) • 12GB/24GB

  12. Cartridge Tape • DTF -- Digital tape format (1/2”) • 42GB • DLT -- Digital linear tape (1/2”) • 35GB/70GB • AIT -- Advanced Intelligent (8mm) • 25GB • VHS -- Video tape • SD1 -- 19mm • 100GB

  13. Magnetic Disk • Direct access • Ability to hold more data in a smaller space • Faster data access speeds

  14. Floppy Disk • 8’, 5 1/4”, & 3 1/2” • I/O device -- floppy disk drive

  15. 5 1/4 DSDD 5 1/4 DSHD 3 1/2 DSDD 3 1/2 DSHD DSED Floptical SuperDisk 360k 1.2MB 720k 1.44MB 4MB 21MB 120MB Floppy Disk CapacitiesDOS

  16. 3 1/2 DSDD 3 1/2 DSHD Floptical SuperDisk 800k 1.4MB 21MB 120MB Floppy Disk CapacitiesMAC

  17. Hard Disk • I/O device -- hard disk drive • Read/write head

  18. Fixed Disk • 1 - 5.25 • Interfaces • IDE (EIDE) - Integrated Drive Electronics • Only daisy chain 2 drives • up to 27 GB • ULTRA IDE, EIDE • SCSI - Small Computer Systems Interface • Daisy up to 6 devices • up to 73 GB • SCSI-2, SCSI Ultra2/Wide

  19. IOMEGA ZIP JAZ JAZ 2 Parallel or SCSI SPARQ QUEST 100MB 250MB 1GB 2GB 4.7GB Removable Cartridge

  20. Optical Technology • Overview • Large storage capacity • removable • not magnetic • Optical Disk • Size • Uses • data, video, audio

  21. CD-ROM • CD-ROM -- Compact Disk, Read-only Memory • 650MB • CD-R • CD-RW • 40x

  22. DVD • DVD -- Digital Videodisk • up to 10GB • DVD-RAM • up to 5.25GB

  23. WORM • WORM -- Write Once, Read Many • 200GB

  24. Erasable Drive • Magneto-Optical • 3.5 MO -- 1.3GB • 5.25 MO -- 5.2GB

  25. Others • Optical Card • Optical Tape

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