16 Sep
2004
16 Sep
'04
8:13 a.m.
>>>> "John" == John Foust
<jfoust(a)threedee.com> writes:
John> At 04:00 PM 9/15/2004, you wrote:
> I do not consider myself a magnetic-media expert,
but I've made a
> number of (low-density) controllers and en/de-coding schemes, and
> repaired others, and read a lot (in one ear out the other
> probably).
John> With platters, there are clean-room issues as well as very
John> difficult alignnment issues - imagine how difficult it would be
John> to re-align a read head with the concentric bands on a platter
John> that may have been slightly misaligned from its original hub.
True for moving head disks, but possibly not for head per track
devices. For example, head alignment of a DEC RF11 (512 kbytes per
platter) was done by eyeball, lining up the heads with engraved
circles on a glass or plexiglass alignment platter.
paul