From owner-freebsd-questions@FreeBSD.ORG Mon Jan 5 03:01:10 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 79A071065679 for ; Mon, 5 Jan 2009 03:01:10 +0000 (UTC) (envelope-from erikt@midgard.homeip.net) Received: from ch-smtp01.sth.basefarm.net (ch-smtp01.sth.basefarm.net [80.76.149.212]) by mx1.freebsd.org (Postfix) with ESMTP id 03BB28FC1D for ; Mon, 5 Jan 2009 03:01:09 +0000 (UTC) (envelope-from erikt@midgard.homeip.net) Received: from c83-255-48-78.bredband.comhem.se ([83.255.48.78]:54399 helo=falcon.midgard.homeip.net) by ch-smtp01.sth.basefarm.net with esmtp (Exim 4.68) (envelope-from ) id 1LJfiG-0006Ug-50 for freebsd-questions@freebsd.org; Mon, 05 Jan 2009 04:01:08 +0100 Received: (qmail 14123 invoked from network); 5 Jan 2009 04:01:07 +0100 Received: from owl.midgard.homeip.net (10.1.5.7) by falcon.midgard.homeip.net with ESMTP; 5 Jan 2009 04:01:07 +0100 Received: (qmail 73040 invoked by uid 1001); 5 Jan 2009 04:01:07 +0100 Date: Mon, 5 Jan 2009 04:01:07 +0100 From: Erik Trulsson To: perryh@pluto.rain.com Message-ID: <20090105030107.GA72879@owl.midgard.homeip.net> References: <4960B7D1.1070403@gmail.com> <4ad871310901040530r2a4c280ds188a679c815db657@mail.gmail.com> <4960BABA.4040705@gmail.com> <4ad871310901040535s5808ddfblcf356bfcb402cf2@mail.gmail.com> <49611f1a.WdTTi/Qznzkq5Qz3%perryh@pluto.rain.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <49611f1a.WdTTi/Qznzkq5Qz3%perryh@pluto.rain.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-Originating-IP: 83.255.48.78 X-Scan-Result: No virus found in message 1LJfiG-0006Ug-50. X-Scan-Signature: ch-smtp01.sth.basefarm.net 1LJfiG-0006Ug-50 d1d9443865af2edc1f6bc48d21898911 Cc: aryeh.friedman@gmail.com, glen.j.barber@gmail.com, freebsd-questions@freebsd.org Subject: Re: OT: how many rankmount units is a tower-case X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Jan 2009 03:01:10 -0000 On Sun, Jan 04, 2009 at 12:42:02PM -0800, perryh@pluto.rain.com wrote: > > If a hard disk formatted and used in a position , in that position > > it may be used if manufacturer is NOT advised a specific position. > > After loading of files into hard disk , change of position may > > cause difficulty in reading of already recorded data . This point > > should be considered . > > Sun, at least, used to warn about this back in the MFM/ESDI days, > recommending that a disk should be reformatted if its orientation > were changed, but those drives used all their heads for data and > depended on reproduceable mechanical positioning to align the heads > at the selected cylinder. I'm not sure it still applies to drives > that dedicate one head to fine-tuning track position by reading > factory-recorded servo patterns. (Quick check, if "actual" geometry > is known: a drive with an odd number of heads most likely has a > dedicated servo surface.) BTW most drives of that era, while OK on > either side as well as "right side up", were *not* supposed to be > run "upside down" -- the bearings were not designed for that. That may well have been true back in those days, but reasonably modern drives[*] do not have those limitations. Todays drives can be mounted in any orientation, and should have no problems being remounted in a new orientation. >From Western Digital's FAQ: Physical mounting of the drive: WD drives will function normally whether they are mounted sideways or upside down (any X, Y, Z orientation). Of course, the physical design of your system may limit the positions in which the drive can be mounted. However, in all cases, you should mount the drive with all four screws for good grounding. Also ensure that there is enough air space around the drive for adequate air flow, and avoid mounting the drive near sources of excessive heat (such as some CPUs). >From Seagate's FAQ: All Seagate & Maxtor's internal hard drives can be fitted sideways or upside down. As long as they can not be moved during use and get enough cooling it is irrelevant in which direction they are mounted. >From Hitachi's installation guide: There are many variations of system cases. Hitachi Deskstar drive can be mounted with any side or end vertical or hori- zontal. Do not mount the drive in a tilted position. [*] "resonably modern drives" includes just about all drives any sane person would even consider using for a new computer build. -- Erik Trulsson ertr1013@student.uu.se