HP drives

Geoffrey Reed geoffr at zipcon.net
Tue Dec 28 18:52:03 CST 2010

On 12/28/10 1:45 PM, "Eric Smith" <eric at brouhaha.com> wrote:

> Tony Duell wrote:
>> Howeer, was there ever a 70 cylinder 5.25" drive? That is one that was
>> only designed to use 70 cylinders ? I mean a raw drive, not a
>> drive+controller like the HP units we're discussing.
> I haven't heard of one, though Micropolis made 77-track 5.25" drives
> with 100tpi (vs. 35 or 40 track at 48tpi and 80 track at 96tpi), and a
> few other vendors offered compatible drives, e.g. the Tandon TM100-4M,
> where the "M" designates it as a 100tpi model.

ISTR:  the 8" drives at least as used in tandy computers formatted out to 77

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