From owner-freebsd-questions@FreeBSD.ORG Sun Jan 4 20:49:11 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 367291065675 for ; Sun, 4 Jan 2009 20:49:11 +0000 (UTC) (envelope-from perryh@pluto.rain.com) Received: from agora.rdrop.com (agora.rdrop.com [199.26.172.34]) by mx1.freebsd.org (Postfix) with ESMTP id 11AF18FC08 for ; Sun, 4 Jan 2009 20:49:11 +0000 (UTC) (envelope-from perryh@pluto.rain.com) Received: from agora.rdrop.com (66@localhost [127.0.0.1]) by agora.rdrop.com (8.13.1/8.12.7) with ESMTP id n04KnA0i090427 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Sun, 4 Jan 2009 12:49:10 -0800 (PST) (envelope-from perryh@pluto.rain.com) Received: (from uucp@localhost) by agora.rdrop.com (8.13.1/8.12.9/Submit) with UUCP id n04KnAkH090426; Sun, 4 Jan 2009 12:49:10 -0800 (PST) Received: from fbsd61 by pluto.rain.com (4.1/SMI-4.1-pluto-M2060407) id AA09736; Sun, 4 Jan 09 12:39:39 PST Date: Sun, 04 Jan 2009 12:42:02 -0800 From: perryh@pluto.rain.com To: m.e.sanliturk@gmail.com Message-Id: <49611f1a.WdTTi/Qznzkq5Qz3%perryh@pluto.rain.com> References: <4960B7D1.1070403@gmail.com> <4ad871310901040530r2a4c280ds188a679c815db657@mail.gmail.com> <4960BABA.4040705@gmail.com> <4ad871310901040535s5808ddfblcf356bfcb402cf2@mail.gmail.com> In-Reply-To: User-Agent: nail 11.25 7/29/05 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: glen.j.barber@gmail.com, aryeh.friedman@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: Sun, 04 Jan 2009 20:49:11 -0000 > 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.