Remembering RAMAC

[Eric Smith]

der Mouse wrote:
> I'd even say that _most_ disks have parallel heads, though they
> generally throw away that parallelism.  (I don't know why;

Because at modern track pitches, there is not enough dimensional
stability to guarantee that the positioner is on-track on all
surfaces simultaneously.  In fact, if it's on-track on one surface
it can be off by many tracks on another.  This is one reason why
they no longer have a servo surface, and instead use embedded
servo on every data surface.

Eric