From owner-aic7xxx Sun Nov 15 12:22:46 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id MAA28660 for aic7xxx-outgoing; Sun, 15 Nov 1998 12:22:46 -0800 (PST) (envelope-from owner-aic7xxx@FreeBSD.ORG) Received: from serpentine.dyn.ml.org (host-209-214-160-160.rdu.bellsouth.net [209.214.160.160]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id MAA28651 for ; Sun, 15 Nov 1998 12:22:41 -0800 (PST) (envelope-from bleh@bellsouth.net) Received: from bellsouth.net (root@paradox.serpentnetwork.com [192.168.1.1]) by serpentine.dyn.ml.org (8.9.1/8.8.2) with ESMTP id PAA15880; Sun, 15 Nov 1998 15:20:54 -0500 Message-ID: <364F37A6.D170CC60@bellsouth.net> Date: Sun, 15 Nov 1998 15:20:54 -0500 From: "There can be only one." Organization: Serpentine Network Industries X-Mailer: Mozilla 4.5 [en] (X11; U; Linux 2.0.34 i686) X-Accept-Language: en MIME-Version: 1.0 To: "Justin T. Gibbs" CC: "Robert G. Brown" , aic7xxx@FreeBSD.ORG Subject: Re: Drive constantly grinding ... References: <199811151946.MAA13725@narnia.plutotech.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-aic7xxx@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Yeah, this makes sense. Thanks for the information, it saves me some worry ;-) > What you are hearing is likely what Seagate calls 'dithering'. > When the drive is otherwise idle, the head is moved to new locations > periodically so that it doesn't pass over the same piece of media > for extended periods of time. The Seagate representative told us > (Pluto) that this was done to ensure that if a plater contained an > imperfection that caused the head to 'brush' the platter occassionally > (not a head crash) the head would not wear out the platter. For > real time applications (Pluto offers real time video editor/server > products) where you want the head to stay where you put it, this > is somewhat annoying. Pluto's work around is to send a Test Unit > Ready command to the drive every 500ms or so which restarts the > 'diterhing timer' and prevents the extra seeks. > > -- > Justin > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-aic7xxx" in the body of the message -- +------------------+-----------------------------------------------------+ | Steve Conley | System Administrator, Serpentine Network Industries | +------------------+-----------------------------------------------------+ | ,.. | Need a place to run your MUCK/MUD? Need a shell | | ("\|||/") | account? Email account? Contact me or visit | | //6_6\\ | http://serpentine.dyn.ml.org | | ./(_Y_)\` +-----------------------------------------------------+ | '//`-'\\` | root@serpentine.dyn.ml.org, tanabi@bellsouth.net, | | //|||||\\ | bleh@bellsouth.net, sdconley@eos.ncsu.edu | | ** |,`````,| +-----------------------------------------------------+ | ** _||` '||_ | Personal Web: http://www4.ncsu.edu/~sdconley | | \/_||, ,||_\ | Mobile Vision: http://www4.ncsu.edu/~bjcruz/CSC452 | | (!(!!)---(!!)!) | Frontiers: http://home.earthlink.net/~originalface/ | +------------------+--------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-aic7xxx" in the body of the message