Hi Patrik,

On 11 Dec 2019 at 19:52, Patrik (Patrik Schindler
<midrange-l@xxxxxxxxxxxxxxxxxx>) commented about
Re: Missing Disk Unit - Identifying:

<content cut>
Does it do a self test after spinup is complete? Can be identified as a brief
tickering noise from head movement immediately after reaching full spindle RPM
I discovered it does hum but it doesn't spin.

I have taken it out. I have:
Turned it over when it was powered off.
Powered it up.
Turned it over while it was powered on.
I did not shock it while it was powered on because I
didn't want the heads to crash.
Swapped power plugs.
Swapped data cable with one that is working.

In all cases the screen comes up saying drive 2 is

Next step I'd do is to connect the disk in question to maybe a PC with a
proper SCSI HBA and look with Linux (live CD) if the disk appears (lsscsi) and
is basically ok (no syslog/kernel messages about read capacity failed).
(Errors about "Unsupported sector size 522." are to be expected. Ignore them.)
I'd do that, because I've a PC especially for testing disks around. Maybe it's
easier for you to skip this step and try other step by step mentioned below.

If it shows up like described, the disk must also work in the 150. If it still
doesn't after reseating, maybe the assigned SCSI connector on the cable might
be faulty. Try to use another, at least temporarily to find the culprit.

If it does *not* show up under Linux, find and buy the same type of disk in
the internet and exchange the controller board on the disk. I had success in
one case with an old 9406-600 and the customer was very happy. In earlier
years, I also repaired disks for common platforms this way.

If it does show up but fails to read capacity, you're most likely doomed.
Usually this error stems from damage at the head amplifier chip (often located
inside the case, to keep connections from heads to amp as short as possible).
Depending on allocated space, you can easily restore backup on two disks
instead of three. No need to insert a third one. With just two disks,
everything will run notably slower, though.

I don't have a PC with Linux. Would you suggest I
purchase a good used one and ship them both to you?

I'm not sure it wouldn't hurt the drive more bouncing
around during shipping.

Or would you suggest I load Linux on a PC and purchase
a SCSI board and you can remote into it to check it out?
I'm good enough to install the OS, but I'm not good with

Maybe it would be easier for us to talk on the phone?

<content cut>

Thank you,


Don't hesitate to ask for further advice if needed.

Good luck!

:wq! PoC

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