On 5/29/07, Julian Wolfe <fireflyst at earthlink.net> wrote:
One CLOK or
multiple CLOKs?
Just one.
I have heard a single loud "tock" from working drives as they release
the head-lock solenoid, but perhaps your head assembly is glued to a
rubber stopper like in some failure modes of, IIRC, Micropolis 1335s,
AKA DEC RD53s. The solenoid would still trip, but the heads wouldn't
load.
This is an IBM brand drive...
Ah. That model is outside my experience with PC-ATs.
and after doing some reading, I found out
IBM-brand drives of this era DO NOT park the heads in a landing zone, they
actually retract them. (Perhaps like the Priam disk you refer to)
I found some tantalizing info at the HTMLization of
www.course.ws/techtalk/downloads/PDF/hardware.pdf in google's cache,
but the HTML file stops in the middle of the entry for the AT, the
original site is gone, and
archive.org didn't have the PDF file
cached. If someone happens to have that file cached on their own,
there's lots of meaty technical details on BIOS revisions and more.
-ethan