Date: Fri, 17 Dec 1999 08:22:03 +0100 (CET) From: Soren Schmidt <sos@freebsd.dk> To: dick@tar.com (Richard Seaman, Jr.) Cc: djb@Wit389306.student.utwente.nl, freebsd-current@FreeBSD.ORG Subject: Re: ATA driver problem?? (lost disk contact) Message-ID: <199912170722.IAA04753@freebsd.dk> In-Reply-To: <19991216165055.A320@tar.com> from "Richard Seaman, Jr." at "Dec 16, 1999 04:50:55 pm"
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It seems Richard Seaman, Jr. wrote: Yup, sounds like the problem some are seing, now I wonder why I havn't seen it on any of the IBM disks I've access to, hmm... It apparantly can't be disabled, but I'll try to figure out if I can detect when the drive is in this mode, or put it in standby mode and back again when there is nothing else to do, that should reset the timer... > On Thu, Dec 16, 1999 at 09:25:11AM +0100, Soren Schmidt wrote: > > > There is this thing with the IBM's doing some headcleaning stuff once > > a day/week, but I've never seen any of my IBM's do that (I got plenty > > of them). I'll try to get more info on that from IBM... > > Check http://www.storage.ibm.com/techsup/hddtech/prodspec/djna_spw.pdf > > On page 99 it says: > > 10.12 Automatic Drive Maintenance (ADM) > > ADM function is equipped to maintain the reliability even in continuous usage. > ADM function is to go into Standby mode automatically after detecting idle mode > at intervals of 6 days. > > This function is always enabled regardless of Standby Timer value. The detail > of Standby Timer is described in 12.6, "Idle (E3h/97h)" on page 122, and 12.32, > "Standby (E2h/96h)" on page 171. > > The 6 days counter is reset at the following. > Power on Ready > Entering Standby mode by Standby Command > Entering Standby mode by Standby Timer > > Both Soft Reset and Hard Reset do not disturb the spin down of ADM. > > If a command is received during spin down of ADM, the drive quits the spin down > and tries to complete the command as soon as possible. > In case the spin down of ADM is disturbed by a command, it is retried 12 hours > later. For timeout concern, refer to 13.0, "Timeout Values" on page 185. -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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