July 2013
Intermediate to advanced
419 pages
14h 24m
English
Content preview from Introduction to Digital Audio, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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9
Magnetic disk drives
Disk drives came into being as random-access file-storage devices for digital computers. However, the explosion in personal computers has fuelled demand for low-cost high-density magnetic disk drives and the rapid access offered is increasingly finding applications in digital audio to the detriment of tape-based storage.
9.1 Types of disk drive
The disk drive was developed specifically to offer rapid random access to stored data. Figure 9.1 shows that, in a magnetic disk drive, the data are recorded on a circular track. In floppy disks, the magnetic medium is flexible, and the head touches it. This restricts the rotational speed. In hard-disk drives, the disk rotates at several thousand rev/min so that the head-to-disk ...
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