> On Feb 18, 2019, at 4:16 PM, Fred Cisin via cctalk <[email protected]>
> wrote:
>
> On Mon, 18 Feb 2019, Liam Proven via cctalk wrote:
>> 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.
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
