srm@Matrix.COM (Steve Morris) (09/12/90)
How does a SCSI drive (Syquest) indicate that the (removable) medium is not currently present? Is there something more descriptive than receiving the UNIT ATTENTION sense key from a REQUEST SENSE command? Thanks for your help. -- _____________________________________________________________ | Steve Morris srm@matrix.com | | Matrix Corporation mcnc!matrx!srm | | 1203 New Hope Road (919)231-8000 Telephone|
kev@hpcpbla.HP.COM (Kevin Jones) (09/13/90)
Knowing nothing about this drive :-) My GUESS would be........ Following a Check Condition'ed TEST UNIT READY, issue a REQUEST SENSE COMMAND. If bytes 12 and 13 of the data returned = 3A00 Hex, this indicates "Medium Not Present" (ANSI SCSI2). ----------------------------------------------------------------- Kevin Jones. | Hewlett Packard Ltd, | Computer Peripherals Bristol, kev%hpcpbla@hplb.hpl.hp.com | Filton Road, | Stoke Gifford, Tel: 011 44 272 799910 (ext 22351) | Bristol. BS12 6QZ. | ENGLAND. ----------------------------------------------------------------- This response does not represent the official position of, or statement by, the Hewlett-Packard Company. The above data is provided for informational purposes only. It is supplied without warranty of any kind.
urlichs@smurf.sub.org (Matthias Urlichs) (09/14/90)
In comp.periphs.scsi, article <1990Sep11.191040.24715@Matrix.COM>,
srm@matrx.matrix.com (Steve Morris) writes:
<
< How does a SCSI drive (Syquest) indicate that the (removable) medium
< is not currently present? Is there something more descriptive than
< receiving the UNIT ATTENTION sense key from a REQUEST SENSE command?
<
Yes -- if the drive is stopped, you'll get a UNIT NOT READY.
Presumably, trying to start the drive would indicate whether a medium is
present. ;-)
(The sense data might also show this, but I didn't test it.)
Unit Attention should only show up when the drive is up again.
It might make sense to prevent the user from removing the medium if a volume
is mounted on it / if the device is opened.
Assuming, of course, that you have an OS whose drivers can find out such
things. (MacOS or Unix drivers can.)
--
Matthias Urlichs -- urlichs@smurf.sub.org -- urlichs@smurf.ira.uka.de /o)\
Humboldtstrasse 7 - 7500 Karlsruhe 1 - FRG -- +49+721+621127(0700-2330) \(o/mwandel@bnr-rsc.UUCP (Markus Wandel) (09/17/90)
In article <1990Sep11.191040.24715@Matrix.COM> srm@matrx.matrix.com (Steve Morris) writes: > >How does a SCSI drive (Syquest) indicate that the (removable) medium >is not currently present? Is there something more descriptive than >receiving the UNIT ATTENTION sense key from a REQUEST SENSE command? Just do a "test unit ready" command -- that's what it's there for. Also, the "mode sense" data has a "media present" bit in it, but that may be only for tapes. Markus Wandel