Common Maxtor MFM drive failure mode -- any ideas?
joe.lang.0000 at gmail.com
Fri Oct 23 03:33:50 CDT 2015
If the bumper is there it will be on the side wall of the HDA where the head actuator would touch when retracted.
If the heads move freely you have a driver failure. the scream is the stepper motor trying to move with only one phase working. (Also a common drive failure.)
> On Oct 23, 2015, at 4:26 AM, Josh Dersch <derschjo at gmail.com> wrote:
>> On 10/23/15 1:19 AM, Joseph Lang wrote:
>> There is a plastic bumper in the head/disk assembly that turns to goo.
>> When the head retracts it hits the bumper and gets stuck in the goo. The goo will eventually win. The head will no longer load. I can't say For sure this is your disk problem but it was a verry common Maxtor failure.
> I thought that was true for Micropolis drives (like the DEC RD53, a Micropolis 1325/1335) -- or does the Maxtor have a rubber bumper as well? As I said I had one open and the heads were not stuck (I could move them with my finger -- while the drive was spinning of course :)) and I didn't notice any goo-laden parts, but maybe I wasn't looking in the right place...
> - Josh
>>> On Oct 23, 2015, at 3:04 AM, Josh Dersch <derschjo at gmail.com> wrote:
>>> Hi all --
>>> I acquired a Symbolics 3640 today and it came equipped with two "large" capacity Maxtor MFM drives (an XT-1140 and an XT-2190). The 1140 spins up fine and we were able to image it using Dave Gesswein's MFM emulator (yay).
>>> The 2190 does not, and it fails in precisely the same way I've personally seen three or four other Maxtor drives of the same era fail: It spins up fine, but when it goes to load the heads, it sounds like the voice coil positioner for the heads is "screaming" -- it emits a high-pitched, quite loud whine/buzz which persists until you power the drive down. The drive is unresponsive during this time.
>>> I'm fairly sure it's not a head crash or anything like that; having gone through this a year or so ago with a similar drive that was scratch anyway, I opened it up and verified that the heads weren't stuck, and I see no evidence of a head crash after disassembly.
>>> Further, the fault does not appear to be on the logic board -- we swapped in a board from a working 2190 tonight and afterwards the drive exhibited the same symptoms.
>>> I've had this happen to other 2190s and 1140s and a few of the ESDI drives in the same family, some of which were working in my possession for weeks before failing -- has anyone else seen this? Any ideas? I'd kind of like to recover the data off of the 2190 from the 3640... drat.
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