Date: Tue, 15 Oct 1996 10:28:35 -0700 (PDT) From: Dave Babler <dbabler@Rigel.orionsys.com> To: freebsd-hardware@freebsd.org Subject: Re: sticky drives (was: your mail) Message-ID: <Pine.BSI.3.95.961015102340.20012C-100000@Rigel.orionsys.com> In-Reply-To: <199610142244.PAA14956@GndRsh.aac.dev.com>
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On Mon, 14 Oct 1996, Rodney W. Grimes wrote: > > 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. > > > > > Isn't the chamber where the platters reside hermetically sealed? If so, > > how would moisture be there to condense in the first place? > > They are not hermetically sealed, they have a bidirection presure release > and filter valve. Look very closely at your disk drives. If they did > not do this (and the tried) the cases would blow apart when ship via > unpressearized air freight at someplace close to 22K feet MSL. > Given the normally controlled environment drives are supposed to operate in, that makes economic sense. I am surprised that an overpressure of 10-12 psi would rupture the case, though, on a volume that small, but then gain the castings that I've seen recently are quite thin to save material. -Dave
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