From owner-freebsd-questions Wed Jul 31 13:22:49 2002 Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B5DE737B400; Wed, 31 Jul 2002 13:22:44 -0700 (PDT) Received: from sheffield.cnchost.com (sheffield.concentric.net [207.155.252.12]) by mx1.FreeBSD.org (Postfix) with ESMTP id 35CDE43E31; Wed, 31 Jul 2002 13:22:44 -0700 (PDT) (envelope-from bakul@bitblocks.com) Received: from bitblocks.com (adsl-209-204-185-216.sonic.net [209.204.185.216]) by sheffield.cnchost.com id QAA01618; Wed, 31 Jul 2002 16:22:42 -0400 (EDT) [ConcentricHost SMTP Relay 1.14] Message-ID: <200207312022.QAA01618@sheffield.cnchost.com> To: Jan Beck Cc: freebsd-hardware@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG Subject: Re: Harddisk damage by driver? In-reply-to: Your message of "Wed, 31 Jul 2002 10:59:01 MDT." <000c01c238b3$91b0a6d0$0401a8c0@jan> Date: Wed, 31 Jul 2002 13:22:40 -0700 From: Bakul Shah Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG > That brings up a very good question. How many people have had problems due > to overheating? Overheating increases the failure rate of drives -- According to IBM, for every degree above recommended levels the rate increases 2 to 3%. You may have been lucky but you can't generalize your experience. Vendors test at a whole bunch of drives under controlled conditions to derive these failure rates. IBM has this to say: Several failure modes within a disk drive are exacerbated by temperature. Thermal tilt of the disk stack and actuator arms can occur very quickly and cause off-track writes, corrupting data on adjacent cylinders. Outgassing of the lubricants in the spindle motor and voice coil motor occurs at high temperatures (experienced over a relatively short 30-60 day time period), which can lead to stiction failures or a possible head crash. Over an extended period of time, the bearings can wear out and cause mechanical failures Conversely you can run your disk cooler than recommended levels and see increased reliability (but don't extrapolate too far!). You can buy disk drive cooling fans. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message