Memorex 102 20MB Hard disk - Found It!
snhirsch at gmail.com
Fri Apr 23 16:23:17 CDT 2010
On Thu, 22 Apr 2010, Tony Duell wrote:
>> A quick update: The drive spins up, comes ready and is passing the seek
>> test in Morrow's FORMATHD.COM utility. The header read fails on all
> Sinc this drive has a transparent cover, I assume you can see the heads
> moving during the seek trst.
Yes, and it tries to walk off the table :-). Serious amount of moving
>> sectors and all cylinders, so something is still amiss. I tried
>> re-writing the sector headers (if I interpret correctly, it is possible to
>> simply rewrite the headers without disturbing data in the sector proper -
> That is not unheard-of. Howeever, I would be a little wary of writing to
> a drive that didn;t read correctly. If something is faulty, it's quite
> possible it's going to write somewhere it shouldn't. And since the drive
> fails on every sector, I would think the fualt is unlikely to be simply
> bad formatting data on the disk.
Ah, well. I doubt there was anything on there of value to me.
>> a new one on me!) but that didn't help. No error on write, but they
>> cannot be read back.
> What error do you get if you try to read them? Does it manage to find
No, it fails 64 times to read every sector on every track.
>> I'll start poking around in the read logic next. Getting closer, anyway.
> I've not looked at the schematics, but I guess I'd start by seeing if (a)
> it was reading anything (do you get any sensible-looking pulses at the
> read data output -- and rmemeber that in 99% of drives the pusle width is
> irrelevant, it's set by a monostable on the logic board, it's the pulse
> spacing that defines the data), and (b) is it selecting one (and only
> one) head
Yes, I'm planning to poke through it with a scope tomorrow.
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