Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ucdavis!iris!heberlei From: heberlei@iris.ucdavis.edu (Todd) Newsgroups: comp.sys.mac Subject: summary: Quantum (Apple) HD problems Message-ID: <4313@ucdavis.ucdavis.edu> Date: 15 May 89 22:24:28 GMT Sender: uucp@ucdavis.ucdavis.edu Reply-To: heberlei@iris.ucdavis.edu (Todd) Distribution: usa Organization: U.C. Davis - Department of Electrical Engineering and Computer Science Lines: 48 I posted a request for HD problems earlier. I also checked with our local Mac repair guru. Here is a summary of what I found: Results from mail in survey: could not find | | could not find | 40 HD on boot | dead 40 HD | 80 HD on boot | dead 80 HD ---------------------------------------------------------- Quantum 14 2 0 1 others 0 2 0 0 * The ones that could not find the 40 HD would usually work after a time to warm up or after a blow (or firm nudge) was delivered to the disk (sounds like the, "kick the TV" way of repairing things). * From what I have heard, the morning boot problems are due to lubrication (grease) solidifying. This would explain why warming up the machine helps. * *Unfortunately*, someone on the net and our local guru said the "morning boot" problem often becomes worse until complete failure occurs. Thus those 14 "morning boot" problems could slip over into the "dead 40 HD" column eventually :-(. * problems occurred with both Mac IIs and SE/30s. * Our local guru said he has seen *lots* of HD failures (I did not include his numbers in the above table), but he did not see any specific patterns (at least not with the Quantums). He did say that two different product lines from the same company often had drastic differences in reliability. (Maybe the 80 HDs *are* better than 40 HDs). My conclusions: Either we have not mastered the technology yet, or we have a quality control problem. Can you imagine if our airplanes had a similar failure rate? -------------- Todd Heberlein heberlei@leek.ucdavis.edu 128.120.57.26 heberlei@iris.ucdavis.edu 128.120.57.20 PS. I saw someone else on the net was doing a survey. If you are reading this and want some of my data, drop me a line.