From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Re: PATA/SATA Disk Reliability paper Date: Tue, 27 Feb 2007 14:06:15 -0500 Message-ID: <45E48127.9020007@tmr.com> References: <45D89FF5.3020303@sauce.co.nz> <200702191426.16567.a1426z@gawab.com> <45DA19C8.8000002@eyal.emu.id.au> <200702201515.01677.a1426z@gawab.com> <87y7mphlpc.fsf@hades.wkstn.nix> <20070222233021.GA10618@seas.ucla.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20070222233021.GA10618@seas.ucla.edu> Sender: linux-raid-owner@vger.kernel.org To: Stephen C Woods Cc: Nix , Al Boldi , Eyal Lebedinsky , linux-raid@vger.kernel.org List-Id: linux-raid.ids Stephen C Woods wrote: > As he leans on his cane, the old codger says.... > Well Disks used to come in open cannisters, that is you took the bottom > cover off, and then put the whould pack into the drive, and then > unscrewed the top cover and took it out.. Clearly ventilated. C 1975. > > Later we got sealed drives, Kennedy 180 MB Winchesters they were > called (the used IBM 3030 technology). The had a vent pipe with two > filters, you replaced the outer one every 90days (as part of the PM > process). The inner one you didn't touch. Aparently they figured that > it'd be a long time before the inner one got really clogged at 10 min > exposure every 90 days. C 1980 > > Still later we had a Mainframe running Un*x, it used IBM 3080 drives > these had huge HDA boxes that wree sealed but hav vent filters that had > to be changed every PM (30 days, 2 hours of down time to do them > all). C 1985. > > So drives do need to be ventilated, not so much wory about exploding, > but rather subtle distortion of the case as the atmospheric preasure > changed. > > Doe anyone rememnber that you had to let you drives acclimate to your > machine room for a day or so before you used them. > > Ah the good old days... > HUH??? > > I remember the DSU-10, 16 million 36 bit words of storage, which not only wanted to be acclimatized, but had platters so large, over a meter in diameter, that ther was a short crane mounting point on the box. Failure rate went WAY down after better air filters were installed. I think they were made for GE by CDC, but never knew for sure. GE was a mainframe manufacturer until 1970, their big claim to fame was the GE-645, the development platform for MULTICS. They sold the computer business, mainframe and industrial control, in 1970 to put money into nuclear energy, and haven't built a power plant since. Then the developed a personal computer in 1978, built a plant to manufacture it in Waynesboro VA, and decided there was no market for a small computer. -- bill davidsen CTO TMR Associates, Inc Doing interesting things with small computers since 1979