From owner-freebsd-hardware Mon Oct 14 14:14:10 1996 Return-Path: owner-hardware Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id OAA26049 for hardware-outgoing; Mon, 14 Oct 1996 14:14:10 -0700 (PDT) Received: from GndRsh.aac.dev.com (GndRsh.aac.dev.com [198.145.92.241]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id OAA26043 for ; Mon, 14 Oct 1996 14:14:05 -0700 (PDT) Received: (from rgrimes@localhost) by GndRsh.aac.dev.com (8.7.5/8.7.3) id OAA14453; Mon, 14 Oct 1996 14:13:40 -0700 (PDT) From: "Rodney W. Grimes" Message-Id: <199610142113.OAA14453@GndRsh.aac.dev.com> Subject: Re: sticky drives (was: your mail) In-Reply-To: <199610141715.KAA21206@root.com> from David Greenman at "Oct 14, 96 10:15:36 am" To: dg@Root.COM Date: Mon, 14 Oct 1996 14:13:39 -0700 (PDT) Cc: gfoster@gfoster.com, freebsd-hardware@freebsd.org X-Mailer: ELM [version 2.4ME+ PL25 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hardware@freebsd.org X-Loop: FreeBSD.org Precedence: bulk > >In all this talk of "twisting" drives (which has never worked for me) > >has anybody mentioned sticking the thing in the freezer overnight? I > >have resurrected a couple of stiction'd drives this way (but it > >doesn't always work). > > 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. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation, Inc. Reliable computers for FreeBSD