Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!tiamat!quintro!bep From: bep@quintro.uucp (Bryan Province) Newsgroups: comp.sys.apollo Subject: Re: DN2500 disk cables Message-ID: <1990Aug16.142430.4235@quintro.uucp> Date: 16 Aug 90 14:24:30 GMT References: <9008141821.AA31711@richter.mit.edu> <5116@labtam.oz> Reply-To: bep@quintro.UUCP (Bryan Province) Organization: none Lines: 42 In article <5116@labtam.oz> scott@labtam.oz (Scott Colwell) writes: >In article <9008141821.AA31711@richter.mit.edu>, krowitz@RICHTER.MIT.EDU (David Krowitz) writes: >.. referring to the new Quantum disk connected to the DN2500... >> It runs *hot*! I don't have a mounting bracket made up >> yet, so I've got it lying in the DN2500 with the disk >> logic board facing up with the DN2500's cover off. The >> disk is quite hot, but the logic board doesn't seem any >> warmer than the DN2500's CPU board. > >Please check the drive manufacturers specification on allowable mounting >orientation. They all (with perhaps the exception of drives for laptops) >have only a few allowed orientations and I have never seen them allow >the drive to be mounted upside down (i.e. with the logic board up). > >... Also I would be concerned if you formatted the drive this way and >even more concerned about the temperature. > >My concern with formatting is that the read/write electronics temp and >head position would be quite different when the disk was formatted than >when it is properly mounted. This is probably less of a concern than running >it upside down for extended periods because I believe the orientation spec >is due to the spindle bearings rather than the head forces or temperature. > >-- >Scott Colwell >Labtam Information Systems P/L net: scott@labtam.oz.au >Melbourne, Australia phone: +61-3-587-1444 Scott may have a point here. We have been having a similar problem with a Maxtor LTX-200. We didn't have brackets so we placed it upside down on the 2500 in the same way that David did. We did this with two drives both were experiencing problems. One of them we fastened to the side of the drive rack with some screws and then stood the 2500 on its side. The problems stopped! I didn't attach any significance to it until I saw this article. The other drive we left upside down and it continued to have problems and we were just about ready to send it back. I'm going to try mounting it differently and see if that makes a difference. Stay tuned Bat fans! -- --=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-- Bryan Province Glenayre Corp. quintro!bep@lll-winken.llnl.gov Quincy, IL "Surf Kansas, There's no place like home, Dude."