07 External Memory - MetaLab

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Continue…• Fig. 6.3 (a) –CAV• The disk is divided into a number of pie-shapedsectors and into a series of concentric tracks.• Advantage of CAV:▫ The individual blocks of data can be directlyaddressed by tracks and sectors.• Disadvantage of CAV:▫ The amount of data that can be stored on the longouter tracks is the only same as what can be storedon the short inner tracks.
Multiple zone recording (MZR)• To increase density , a technique call MZR isintroduce.• In MZR, the surface is divided into a number ofconcentric zones• Within a zone, the number of bits per track isconstant• Zones farther from the center contain more bits(since more sectors) than zones closer to the center.• This allow greater storage capacity• However this require more complex circuitry
Page 1 and 2: William StallingsComputer Organizat
Page 3 and 4: Magnetic Disk• Disk - a circular
Page 5 and 6: Inductive Write MR Read
Page 7 and 8: Disk Data Layout
Page 9: Disk Layout Methods Diagram
Page 13 and 14: Removable or Not• Removable disk
Page 15 and 16: Multiple Platters
Page 17 and 18: Classification of disk based on hea
Page 19 and 20: Disk performance parameters• The
Page 21 and 22: Optical Storage CD-ROM• Originall
Page 23 and 24: Continue..• Data on CD/CD-Rom is
Page 25 and 26: Other Optical Storage• CD-Recorda
Page 27 and 28: DVD - technology• Multi-layer•
Page 29 and 30: Magnetic Tape• Tape system use th

07 External Memory - MetaLab

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