Chapter 8. Hard Drives. Inside the Drive. Aluminum platters are coated with a magnetic medium. Platters spin at 3,500 to 10,000 rpm and read/write head “floats across platters.” Never open a hard drive: the littlest bit of dust could cause catastrophic damage. Data Encoding.
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IBM thought that dealing with CHS was too hard for most users so they created 15 hard drive types for the 286 AT.