Post on 19-May-2015
description
NameName
Munazza Javed
Roll no
F12-1022 Program
BSCS
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
8888CH
AP
TE
R
SECONDARY STORAGE
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Secondary StorageNon-VolatilePermanent
8-3
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
SEQUENTIAL ACCESS DEVICE DIRECT ACCESS DEVICE
8-4
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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.
8-5
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Storage Organizations Storage Capacity Data Transfer Rate Tape Drive Tape Controller
8-6
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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 | | | | | | | | |
8-7
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
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
8-8
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
8-9
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