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From: dolf@fwi.uva.nl (Dolf Starreveld)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Automatic Head Parking for hard disks
Message-ID: <1041@carol.fwi.uva.nl>
Date: 31 May 90 17:23:12 GMT
References: <1990May27.033125.8297@athena.mit.edu> <2691@cooper.cooper.EDU>
Sender: news@fwi.uva.nl
Lines: 23

joseph@cooper.cooper.EDU (Joe Giannuzzi) writes:

> in article <1990May27.033125.8297@athena.mit.edu>, shahn@hstbme.mit.edu (Samuel Hahn) says:
>> Do the Apple hard disks automatically park their heads after issuance of the
>> "Shut Down" command from the Finder or is a separate INIT/DA required to en-
>> sure that this is down every shut down?
>> 
>	There is a utility available in the sumex archives called
> 	SCSI Parker. It is a cdev (by the same person who wrote
> 	SoundMaster) that allows you to select which SCSI devices
> 	receive a 'PARK' command upon system shutdown.

There is no such SCSI command. WHat is used is the Start/Stop unit command.
On most drives this stops the spindle motor and retracts the heads to their
reserved landing zone. The same command with a few bits changed can usually
also be used to restart the motor.

--dolf
--
Dolf Starreveld  Phone: +31 20 592 5056/5022 (FAX: 5155), TELEX: 10262 HEF NL
EMAIL:           dolf@fwi.uva.nl (dolf%fwi.uva.nl@hp4nl.nluug.nl)
SNAIL:           Dept. of Math. and Computing Science, University of Amsterdam,
                 Kruislaan 409, NL-1098 SJ  Amsterdam, The Netherlands