31 Dec
2007
31 Dec
'07
5:53 p.m.
On 31/12/2007 17:22, dwight elvey wrote:
This is important because many drives that had the
auto step, were
really slow using the fixed rate step. I had this problem getting
a ST251 to run on my Olivetti M20. The original drive had a fast step
rate of something like 6 ms. The ST251 wouldn't work faster than
10ms as I recall but the auto rate was much faster.
I remember a similar issue on one of my old machines. Some of those
hard drives stepped more slowly than many floppys! A genuine ST506 has
a 3ms step rate, while a genuine ST412 accepts seek pulses at 5-500
microsecond intervals (any slower than 0.5ms, and it assumes they're not
going to be buffered but then they do have to be *much* slower).
--
Pete Peter Turnbull
Network Manager
University of York