munazza javed chapter08

NameName

Munazza Javed

Roll no

F12-1022 Program

BSCS

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8888CH

AP

TE

R

SECONDARY STORAGE

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Secondary StorageNon-VolatilePermanent

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SEQUENTIAL ACCESS DEVICE DIRECT ACCESS DEVICE

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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.

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Storage Organizations Storage Capacity Data Transfer Rate Tape Drive Tape Controller

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Track / Channel numbers char of corresponding

codes

0 1 2 3 4 5 6 7 8 9 A B C D E F G H I 7 | | | | | | | | | | per bits 6 | | | | || | | | 5 | | | | || | | | zone 4 | | | | | 3 |||| |||| | 2 | | | | | | | |

Numeric 1 | | | | | | | | |

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Track /channel char for corresponding 0 1 2 3 4 5 6 7 8 9 A B C 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

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