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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Hard drive spins with variable speed ... phase damage????
Date: Tue, 03 Dec 2002 22:12:50 GMT
NNTP-Posting-Date: Tue, 03 Dec 2002 14:12:50 PST
> I need to rescue the data of a SCSI drive (Quantum Viking II 9.1GB
> 7200 rpm). It seems the disk has a problem with the motor because I
> can hear it spinning at one speed and then it slows down to another
> speed, and then again it goes up, and then down again. From what I
> have read it could be that one of the motor phases have damage, and
> thats why the motor can=B4t reach it=B4s 7200 rpm.
> To open the drive I can use a laminar clean bench at my university. My
> doubt is the following: Can I speed the motor myself with another tool
> and make the disk reach the 7200 rpm and then make an image of the
> drive to another disk? Is that possible? Should the disk spin at 7200
> rpm exactly ?? or will it work at 7000rpm or 7500rpm for example??
> Thanks for your time, I appreciate any help.
> Sorry for my english but it is not my native language. (I am from
> Nicolas Mella
A little information. BTW, I was never a spindle guy until I got into
optical so I know less about trends in spindle control.
- Does the spindle motor have three wires or does it have 8 or more?
- Can you look at the phases with an oscilloscope? If they all look
alike, the motor and driver are probably OK.
- Given you can do the above, what is the maximum frequency you see on
one phase? I won't hazard a guess because I have no clue how many poles
the motor has (I'm kind of used to 12 pole motors right now).
- Can you hear the head actuator come out of latch (depending on latch
design, this may be subtle)?
- Is there any scraping noise at all when the drive is powered?
... The times have been, =
That, when the brains were out, =
the man would die. ... Macbeth =
Chuck Simmons firstname.lastname@example.org
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