14 Jan
2011
14 Jan
'11
1:38 p.m.
Tony Duell wrote:
For pure bad deisgn, nothing beats the Shugart SA4000
hard disk,
IMHO. On
that thing, you can eitehr send the step pulses one at
a time, waiting
for hte 'on cylinder; signal to go active after each one. Or you can
send
a burdt sufficiently fast that the drive will buffer
them, then move the
head and assert 'on cylinder' when it's done. But if you send the burst
of sstep pulses too _slowly_, the drive wil lget confusedand end up o
nthe worng cyulinder.
That's definitely less than ideal, but if they documented the minimum
burst rate in the OEM manual, an engineer designing a controller for it
I would not have had any serious complaint.