From owner-freebsd-hackers Sun Sep 3 23:45:10 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.FreeBSD.org (8.6.11/8.6.6) id XAA18707 for hackers-outgoing; Sun, 3 Sep 1995 23:45:10 -0700 Received: from tango.rahul.net (tango.rahul.net [192.160.13.5]) by freefall.FreeBSD.org (8.6.11/8.6.6) with SMTP id XAA18701 for ; Sun, 3 Sep 1995 23:45:09 -0700 Received: from bolero.rahul.net by tango.rahul.net with SMTP id AA17214 (5.67b8/IDA-1.5 for ); Sun, 3 Sep 1995 23:44:17 -0700 Received: from RockyMountain.rahul.net by bolero.rahul.net with SMTP id AA07382 (5.67b8/IDA-1.5); Sun, 3 Sep 1995 23:44:11 -0700 Received: by RockyMountain.rahul.net id AA17202 (5.67b/IDA-1.5); Sun, 3 Sep 1995 23:41:20 -0700 Date: Sun, 3 Sep 1995 23:41:20 -0700 From: Pete Delaney Message-Id: <199509040641.AA17202@RockyMountain.rahul.net> To: rgrimes@gndrsh.aac.dev.com, karl@mcs.com Subject: Re: 4GB Drives - Another Hawk bits the dust after a a short 3 month flight; Loading NetBSD ! Cc: karl@mcs.net, pete@RockyMountain.rahul.net, pete@kesa26.kesa.com, wally%wally@pdss.com, jbryant@argus.iadfw.net, freebsd-hackers@freebsd.org, pete@rahul.net Sender: hackers-owner@freebsd.org Precedence: bulk Karl/Rodney: > > > I like the Seagate Hawk series, and the 'Cudas *IF YOU CAN KEEP THEM COOL*. More like air conditioned. > > > > The Hawk is okay, and already stated as my model of choice on a price/size/ > > performance/reliabity point at the 4G mark. The Barracuda is off the > > bottom of the scale given the ``KEEP THEM COOL'' requirement and the > > significant initial product failure rates from Seagate gave them a very > > bad name in many communities. Even though Seagate has corrected the head > > meltdown/media flake problem that sour taste remains in many peoples > > mouths. > > I have no problem meeting environmental requirements as long as I know what > they are! In the case of the 'Cudas, I do. Maybe SeaCrate would have a lot of headackes by adding a warning note that their drives are substantially more sensitive to the ambient temperature than other drives. > > > that was not specifically designed to handle the heat dissapation of > > the Barracuda. SGI's official statement is ``don't put them inside > > the system boxes, but them in external enclosures''. AAC's official > > statement is ``don't use them at all''. > > Our official statement is "Install only in our 4-drive enclosures" (which > have five fans :-)) Case temperature never exceeds 82 degrees F if you do > this; we have a pyrometer and check such things. > > On the other hand, they will reach in excess of 120 F in a typical PC case, > and at that temp they WILL fail. Great, they must have used wax to hold the head on. The Installation guide says that the ambient termperature should be 50 C (122 F) which is close to your 120 F is only 48.89 C. They quote the HDA temperature as being 60 C (140 C). I assume that HDA is The temperature on the surface of the drive. I recall the maximum surface temperature on the Micropolus 1.0Gb was 160 C. In Germany I had some problems with Fujitsu drives running hot and started my current approach of adding a rather large (20W) fan in the Pizza Box where the floppy drive usually goes. This keeps the drives very cool, about 5 C from the ambient. I found the Hawk only running luke warm (85 .. 95 F), when I checked it a few times. I wonder if a major factor isn't the rate of rotation, but rather the disk head activity. I doubt that I the drive was very busy when I checked the temperature. In the past I've always found the terperature independant of the drive activity. Why else would the problem have occured after doing some heavy disk I/O? > > -- > -- > Karl Denninger (karl@MCS.Net)| MCSNet - The Finest Internet Connectivity > Modem: [+1 312 248-0900] | (shell, PPP, SLIP, leased) in Chicagoland > Voice: [+1 312 803-MCS1] | 7 Chicagoland POPs, ISDN, 28.8, much more > Fax: [+1 312 248-9865] | Email to "info@mcs.net" WWW: http://www.mcs.net > ISDN - Get it here TODAY! | Home of Chicago's *Three STAR A* Clarinet feed! I'm a Beta for the ZyXEL ISDN modem, I expect it to arrive shortly. -pete