Xref: utzoo comp.sys.mac:50861 comp.sys.mac.hardware:2333
Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!usc!wuarchive!kuhub.cc.ukans.edu!kudlacek
From: kudlacek@kuhub.cc.ukans.edu
Newsgroups: comp.sys.mac,comp.sys.mac.hardware
Subject: Re: SE/30 with (bad) 40mb disk
Message-ID: <22519.2602bdeb@kuhub.cc.ukans.edu>
Date: 18 Mar 90 04:44:59 GMT
References: <1990Mar15.145401.17551@aucs.uucp>
Distribution: na
Organization: University of Kansas Academic Computing Services
Lines: 14

In article <1990Mar15.145401.17551@aucs.uucp>, paul@aucs.uucp (Paul Steele) writes:
> A few months ago there were a lot of rumors about the 40 MB disk in
> the Mac SE/30 having problems due to too much lubrication on the spindle
> motor (or something like that).  The fix that I heard about was a ROM
> uprade that removed the problems but made the disk very slow. 

The actual problem was that these drives were sticking and not 
getting enough torque at startup to move the heads... The ROM fix
increases a voltage (or current?) to give the stepper motor more
uumph. Additionally, the ROM invokes a periodic head sweep during 
normal operation to keep the lubricant slippery. Neat idea huh!

IN%"KUDLACEK@KUHUB.CC.UKANS.EDU"
The Unversity of Kansas - we invented basketball!