Remembering RAMAC

[der Mouse]

> Some disks had parallel heads too -- the CDC 6638 is 12 bits
> parallel.

I'd even say that _most_ disks have parallel heads, though they
generally throw away that parallelism.  (I don't know why; the most
plausible reason that comes to mind is a "buh-but that's not how disks
work" mindset.)

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