Xref: utzoo comp.sys.mac:42791 comp.sys.mac.hardware:500
Path: utzoo!attcan!uunet!aplcen!uakari.primate.wisc.edu!gem.mps.ohio-state.edu!apple!well!espen
From: espen@well.UUCP (Peter Espen)
Newsgroups: comp.sys.mac,comp.sys.mac.hardware
Subject: Re: Quantum ROM fix report
Message-ID: <14679@well.UUCP>
Date: 21 Nov 89 17:24:00 GMT
References: <14618@well.UUCP> <9323@batcomputer.tn.cornell.edu>
Lines: 29

In article <9323@batcomputer.tn.cornell.edu>, eacj@batcomputer.tn.cornell.edu (Julian Vrieslander) writes:
> 
> I do notice that the drive will occasionally exercize its swing arm when
> there is no read/write going on.  Every few minutes there is a very brief
> sound, as if the arm makes one stroke and stops (I have not timed it).
> It was a bit disconcerting at first, but the activity is barely audible and does
> not interfere with the subjective responsiveness of the drive.  In fact,
> most folks are pleasantly surprised at the speediness of this disk (of course,
> the IIci gets some of the credit here).
> 
> Is the spontaneous activity on the 40 and 80 meg Quantums much more frequent
> and noisy?
> 
> -- 
> Julian Vrieslander 
> Neurobiology & Behavior, W250 Mudd Hall, Cornell University, Ithaca NY 14853    
	 As far as I know, most of the Pro series 105 drives
have been immune from the "stiction" problem that has been killing the 40 and
80 Meg Quantums. I'm not sure why your drive is doing what it is, but it 
sounds to me like a part of normal operation. I've always noticed that my
Mac II and also the MacIIcx at work does this occasionally. I think it depends
on what programs you're running etc.. 
	What happens if you have the ROM fix installed on a Quantum is a random
exercising of the head arm that can last for several minutes and is quite
noticable. This exercise routine drastically degrades the performance fo the
drive when it is occurring.

	Peter Espen
	(espen@well)