11 Mar
2005
11 Mar
'05
1:38 p.m.
On Mar 11 2005, 12:44, Randy McLaughlin wrote:
From: "Michael Sokolov" <msokolov at
ivan.harhan.org>
> Changing the RPM is an option on SOME drives, and
for PeeCees to
work it
> must be OFF. It is very useful for Classic
Computers, though.
>
> The high density select signal (pin 2) may or may not switch RPM,
but it
> always switches the write current.
No, I have refered to the TEAC site and to WDC:
WDC referes to pin 2 as speed select, their controller can be used
with
either single speed or dual speed 1.2mb drives:
http://www.wdc.com/en/library/legacy/controllerboards/1006mm1.pdf
Michael is correct, the exact function varies from drive to drive, and
it always involves changing the write current. Some drives have
several jumpers to affect this. I could show you several from my
collection like that. Some controllers work at two speeds, some at two
data rates. Some of the WD controllers can be configured either way.
--
Pete Peter Turnbull
Network Manager
University of York