[TUHS] Disk data layout (was: /dev/drum)
clemc at ccc.com
Sat Apr 28 04:37:15 AEST 2018
On Fri, Apr 27, 2018 at 2:16 PM, Paul Winalski <paul.winalski at gmail.com>
> On 4/27/18, Dave Horsfall <dave at horsfall.org> wrote:
> > On Wed, 25 Apr 2018, Paul Winalski wrote:
> >> Bin number was zero except on the IBM 2321 data cell drive. CKD drives
> >> supported a variable number of records on each track, hence the term
> >> "record" rather than "sector".
> > Would that have been the infamous chicken-plucker?[*] Wherein if things
> > went OK, then they were OK, but if things went wrong...
> That's the one. I'd always heard "noodle picker", though. From the
> outside it looked like a drum in the shape of a multi-sided polygon.
> Each bin held a number of wide pieces of multitrack magnetic tape. To
> seek to your data, the drum rotated under a head that pulled the
> appropriate tape out of the bin and wrapped it on rotating drum. From
> there reading and writing was much like any other drum device. It's
> as if someone asked Rube Goldberg to design a disk drive.
Accept that it will like tape in the head contacted the media.
Question for Debbie S --- my memory is you folks had one up the hill at
LBL. I think that's where I saw it in action.
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