18 Feb
2019
18 Feb
'19
1:38 p.m.
On Feb 18, 2019, at 4:16 PM, Fred Cisin via cctalk
<cctalk at classiccmp.org> wrote:
On Mon, 18 Feb 2019, Liam Proven via cctalk wrote:
Then again, I remember our college RS64 (drive for the RC11) which developed a bad motor
bearing. Since the platter is mounted directly on the motor spindle that was a problem.
And it was not under contract, so replacing the motor would have set back the department a
substantial sum. So the DEC FS engineer removed the motor and carried it to Appleton
Electric Motor Co., which pulled the old bearing, pressed on a replacement, and handed it
back. Jim reinstalled the motor, all was well. Didn't even lose any data bits.
paul
Well that is the thing, of course. I had that
with one old IDE disk,
too. It made a terrible ear-piercing high whine that I associate with
a failing disk... but it passed every diagnostic I could throw at it,
so I used it for non-critical stuff and in testbed machines.
One of the moxt common causes of a terrible ear-piercing high whine is the spindle
contact. Many old drives had a springy piece that rubbed against the end of the spindle.