From owner-freebsd-hardware Mon Oct 14 15:35:05 1996 Return-Path: owner-hardware Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id PAA01590 for hardware-outgoing; Mon, 14 Oct 1996 15:35:05 -0700 (PDT) Received: from Rigel.orionsys.com (root@rigel.orionsys.com [205.148.224.9]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id PAA01580 for ; Mon, 14 Oct 1996 15:35:01 -0700 (PDT) Received: from localhost (dbabler@localhost) by Rigel.orionsys.com (8.7.6/8.6.9) with SMTP id PAA18121; Mon, 14 Oct 1996 15:34:48 -0700 (PDT) Date: Mon, 14 Oct 1996 15:34:48 -0700 (PDT) From: Dave Babler To: "Rodney W. Grimes" cc: freebsd-hardware@freebsd.org Subject: Re: sticky drives (was: your mail) In-Reply-To: <199610142113.OAA14453@GndRsh.aac.dev.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-hardware@freebsd.org X-Loop: FreeBSD.org Precedence: bulk On Mon, 14 Oct 1996, Rodney W. Grimes wrote: > > This is extremely dangerous, BTW. When you take the drive out of the > > freezer, condensation may form on the platters as the drive heats up. > > Conversely, frost may form on the platters as the drive drops below freezing. > > This is absolutely true, dropping a drive below 0 deg C is a sure fire > way to damage it. Even the non-operating temp spec on almost all mfg's > disk is +5 C on the lower end. Having done MIL-SPEC drive work that > had to operate over -55 to +125 C the actual hardest part of this range > was the -5 to +5 C range, condensation being a real killer. Isn't the chamber where the platters reside hermetically sealed? If so, how would moisture be there to condense in the first place? -Dave