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From: emmo@moncam.co.uk (Dave Emmerson)
Newsgroups: comp.sys.ibm.pc,comp.unix.aux,comp.sys.mac.hardware,comp.sys.ibm.pc.rt,comp.unix.aix
Subject: Re: CDC Wren III hard drive parking mechanism
Summary: a more likely explanation
Message-ID: <644@marvin.moncam.co.uk>
Date: 6 May 90 03:49:18 GMT
References: <29312@ut-emx.UUCP>
Organization: Monotype ADG, Cambridge, UK
Lines: 18

In article <29312@ut-emx.UUCP>, nghiem@ut-emx.UUCP (Alex Nghiem) writes:
> We have a CDC Wren III that just crashed. Our tests indicate boot
> sector 0 is bad. However, upon closer observation we note that
> the clicks that normally occur when the auto head park mechanism
> disengages upon power-up is not there any more, leading us to
> speculate that maybe the head is stuck in the park position.
> Is this a common occurence with CDC Wren drives? Is there a 
> simple fix?
> 

Probably not actually 'stuck', more likely the stepper motor
amplifier blown. If you haven't done anything silly there's
a high probability of repair without loss of data.

We had a couple of problems with early models, but none have
so far done anything like that.

Dave E.