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
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