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Unformatted text preview: ost track. To maintain a fixed number of sectors per track, the sectors were spaced further apart on the outer tracks. This was a reasonable approach when areal densities were relatively low. However, as areal densities increased, the gaps between sectors (where no data bits were stored) became unacceptably large. Thus, modern high-capacity disks use a technique known as multiple zone recording, where the set of tracks is partitioned into disjoint subsets known as recording zones. Each zone contains a contiguous collection of tracks. Each track in a zone has the same number of sectors, which is determined by the number of sectors that can be packed into the innermost track of the zone. Note that diskettes (floppy disks) still use the old-fashioned approach, with a constant number of sectors per track. The capacity of a disk is given by the following: Disk capacity # bytes sector surfaces ¢ average # sectors ¢ # tracks ¢ # platter ¢ # platters track surface disk For example, suppose we...
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This note was uploaded on 09/02/2010 for the course ELECTRICAL 360 taught by Professor Schultz during the Spring '10 term at BYU.

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