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Unformatted text preview: sks have limited capacity. However, for the
same number of disk platters of the same size, Winchester disks can manage, to have
larger storage capacity than disk packs due to the following reasons:
- Because both the disk platters and the disk drive are sealed in a contamination-free
container and do not require to be separated later, all the surfaces of all the disk platters (including the upper surface of the topmost platter and the lower surface of the
bottommost platter) are used for data recording in case of Winchester disks. That is, for a
Winchester disk with foui platters, there are eight surfaces on which data can be recorded,
as opposed to six surfaces in case of a disk pack with four platters.
- The contamination-free environment allows Winchester disks to employ much greater
precision of data recording and accessing, resulting in greater density of data storage than
the interchangeable disk packs.
Winchester disks were so named after the 30-30 Winchester rifle because the early
Winchester disk systems had two 30-MB disks sealed together with the disk drive. The
storage capacity of today's Winchester disks is usually of the" order of a few tens of
megabytes to a few gigabytes (10 bytes).
Why do hard disks outperform floppy disks?
Hard disks outperform floppy disks in both data storage capacity and data access speed
due to the following reasons: 1. A floppy disk drive is normally designed to operate with only one floppy disk platter,
whereas a hard disk drive normally operates with multiple hard disk platters, providing
several times more data storage capacity.
2. The rigid construction of hard disks as opposed to flexible construction of floppy
disks, allows higher precision in pinpointing positions on the disk, resulting in higher
data storage densities on disk surfaces. The contamination-free sealed environment of
Winchester disks allows its read/write head to fly much closer to the surface of the disk,
allowing much greater precision and further increase in disk densities. For instance,
floppy disks normally have 135 tracks per inch, whereas hard disks can easily have more
than 1000 tracks per inch.
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- Spring '14