Date: Sun, 15 Nov 1998 15:20:54 -0500 From: "There can be only one." <bleh@bellsouth.net> To: "Justin T. Gibbs" <gibbs@narnia.plutotech.com> Cc: "Robert G. Brown" <rgb@phy.duke.edu>, aic7xxx@FreeBSD.ORG Subject: Re: Drive constantly grinding ... Message-ID: <364F37A6.D170CC60@bellsouth.net> References: <199811151946.MAA13725@narnia.plutotech.com>
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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
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