> In theory, until the disks are spinning at full speed, you don't get that 
> "cushion of air" for the heads to "fly" on, which should result in wear. 
> Of course, no doubt manufacturers know all about this and have come up 
> with ways to at least reduce the problem...

There's probably just a reserved portion of the platter that is used for 
spin-up/down operations.  The only tricky bit is to get the head over to 
that portion when the power is suddenly cut.

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