munazza javed chapter08

9
Name Name Munazza Javed Roll no F12-1022 Program BSCS

Upload: raza-umer

Post on 19-May-2015

147 views

Category:

Education


1 download

DESCRIPTION

Lahore Leads University 923224907404

TRANSCRIPT

Page 1: Munazza javed chapter08

NameName

Munazza Javed

Roll no

F12-1022 Program

BSCS

Page 2: Munazza javed chapter08

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.

8888CH

AP

TE

R

SECONDARY STORAGE

Page 3: Munazza javed chapter08

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.

Secondary StorageNon-VolatilePermanent

8-3

Page 4: Munazza javed chapter08

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.

SEQUENTIAL ACCESS DEVICE DIRECT ACCESS DEVICE

8-4

Page 5: Munazza javed chapter08

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.

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

Page 6: Munazza javed chapter08

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.

Storage Organizations Storage Capacity Data Transfer Rate Tape Drive Tape Controller

8-6

Page 7: Munazza javed chapter08

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.

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

Page 8: Munazza javed chapter08

© 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

Page 9: Munazza javed chapter08

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.

8-9

THANK YOU