August 2011
Intermediate to advanced
312 pages
12h 13m
English
Content preview from Digital Storage in Consumer Electronics
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CHAPTER 2
Fundamentals of Hard Disk Drives
2.1 Basic Layout of a Hard Disk Drive
Hard disk drives have a long history. Magnetic recording was fi rst patented by the
Danish inventor Vladimer Paulsen in 1898 using electromagnets and magnetic wires. Up
to the 1950s (as well as later) engineers developed ways to use magnetic recording to
record analog music and other recordings on various media including tapes and discs. In
1956 IBM introduced the fi rst digital magnetic disk drive, the RAMAC (Random Access
Method of Accounting and Control). The RAMAC had a total storage capacity of 5
million characters (somewhat less than 5 MB) ...
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