RK05 packs

[Paul Koning]

> 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.

	paul