paulkoning at comcast.net
Wed Sep 7 13:46:49 CDT 2016
> On Sep 7, 2016, at 2:45 PM, Al Kossow <aek at bitsavers.org> wrote:
> On 9/7/16 11:21 AM, Paul Koning wrote:
>> That would fit the IBM 2315 if indeed it used one sector notch for each sector (it has 8 per track).
> and 100 TPI
> Original Diablo drives were also 100 TPI, and used silver colored heads, moving to 200 TPI and the more
> common white ceramic heads.
> Apparently, the 100 TPI Diablo heads are extremely difficult to find today. I remember all the 100 TPI
> Diablo drives at a friend's company getting converted to 200.
TPI, as in "transitions per inch"?
I vaguely remember that the 1311 (20 sectors of 200 digits each per track) used silvery colored heads. I wonder if those are the same. They were pretty sturdy; one day when we had a hydraulic leak, the FE just cleaned heads and pack with isopropyl alcohol, fixed the leak, and put the drive and pack back into service.
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