Munazza javed chapter08

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  • Secondary storage devices are used to save, to back up, and to transport files Over the past several years, data storage capacity has expanded from saving numbers and text to include digital images and video Competent end uses need to know the capabilities, the limitations, and the uses of floppy disks, hard disks, opticak disks, and other types of secondary storage
  • Permanently save information for: future use; to share info with others; to modify at later date Secondary storage is nonvolatile – stores programs and data as opposed to temporary storage (RAM)
  • Munazza javed chapter08

    1. 1. Name Munazza Javed Roll no F12-1022Program BSCS
    2. 2. 8 CHAPTER SECONDARY STORAGE© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
    3. 3. Secondary StorageNon-VolatilePermanent 8-3 © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
    4. 4.  SEQUENTIAL ACCESS DEVICE DIRECT ACCESS DEVICE 8-4 © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
    5. 5.  Most Popular Sequential Device It Consists Of A Plastic Ribbon Usually (1/2 inch or ¼ inch) Wide Coated With A Recording Material That Can Be Magnetized. The Tape Ribbon Is Stored In Reels, Small Cartridge, Or Cassette. 8-5 © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
    6. 6.  Storage Organizations Storage Capacity Data Transfer Rate Tape Drive Tape Controller 8-6 © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
    7. 7.  Track / Channel numbers char of corresponding codes 0123456789 ABCDEFGHI 7 || | || | | | | | per bits 6 | | | | || | | | 5 | | | | || | | | zone 4 | || || 3 |||| |||| | 2 | | | | | || | Numeric 1 | | | | | | | | | 8-7 © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
    8. 8.  Track /channel char for corresponding 0123456789 A BC 9 || 8 digits 8 || || || 2 digits 7 |||||||||||| | || | Added Zone 6 |||||||||||| | || | Added Zone 5 |||||||||||| Zone 4 | | || | Parity 3 | ||||||||||| Zone 2 | | | | | | | Unit’s Digits 1 |||| 4 digits 8-8 © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
    9. 9. THANK YOU 8-9 © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.

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