Path: utzoo!attcan!uunet!mcsun!hp4nl!nikhefk!keeshu
From: keeshu@nikhefk.UUCP (Kees Huyser)
Newsgroups: comp.sys.mac.hardware
Subject: Re: CMS Hard Drive Question/Help
Message-ID: <771@nikhefk.UUCP>
Date: 14 Aug 90 13:19:06 GMT
References: <918@sppy00.UUCP>
Sender: keeshu@nikhefk.uucp (Kees Huyser)
Reply-To: keeshu@nikhefk.UUCP (Kees Huyser)
Distribution: comp.sys.mac.hardware
Organization: the National Institute for Nuclear Physics; Netherlands
Lines: 27

In article <918@sppy00.UUCP> ejm@sppy00.UUCP (Eric Miller) writes:
#
#I currently have a MacPlus with 1mb RAM and a CMS 20mb external hard drive.
#About once a week I can't boot the hard drive, I turn the system on and
#I receive that ever-so-annoying question mark prompt.  

I think the problem lies in the fact that the CMS drives have a power supply
which bounces between ~4.5 Volt and 5.2 Volt. When the voltage drops under
5.0 Volt, the drive won't boot and the Mac shows the ?-icon.
The solution is either take your drive to the shop where you bought it and
ask a technician to turn up the voltage to >5.2 Volt, or do it yourself if
you can use a Voltmeter (this may void your warranty!).

I run a lab with ~150 CMS drives and we usually check all power supplies before
giving the drive out to the user. Atfter this short operation (+/- 5 mins.)
we allmost never see this problem recur.

--kees
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