On Fri, 25 Nov 2005, Allison wrote:
>>The all time worst was the 1771 internal data
sep. Tandy initally did
>that to save parts. Really bad.
The 1771 may have CLAIMED to have an internal data separator; performance
did not bear that out.
Tandys EI design got me a few trips to FtWorth to
massage their heads
with a bat for what they did.
You were much too gentle. Next time, we'll loan you a bigger bat.
Yes, 1meg was way above the usual 190k-380k common for
for DDDS drives.
The highest I got to with MFM was 800k (80tr 2sided).
880K but a pain to use.
In particular,
we gave up on Micropolis because of their stubborn
insistence on using a leadscrew positioner, long after almost everyone else
went to the faster taut-band. I still have a 96 tpi Micropolis drive that
The disk
that Shugart used while innovative was really bad for repeatability
of position and slooowwww.
the Micropolis lead screw was SLOW. But noticably more reliable than
either the Shugart spiral, or the split bands.