Date: Thu, 16 Dec 1999 16:50:55 -0600 From: "Richard Seaman, Jr." <dick@tar.com> To: Soren Schmidt <sos@freebsd.dk> Cc: djb@Wit389306.student.utwente.nl, freebsd-current@FreeBSD.ORG Subject: Re: ATA driver problem?? (lost disk contact) Message-ID: <19991216165055.A320@tar.com> In-Reply-To: <199912160825.JAA71207@freebsd.dk>; from sos@freebsd.dk on Thu, Dec 16, 1999 at 09:25:11AM %2B0100 References: <19991216091950.B8469@relativity.student.utwente.nl> <199912160825.JAA71207@freebsd.dk>
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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. -- Richard Seaman, Jr. email: dick@tar.com 5182 N. Maple Lane phone: 262-367-5450 Chenequa WI 53058 fax: 262-367-5852 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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