Query removable drives (CD-ROMs, flopies etc) for media presence

Is there reliable way to query drives for media presence? I have tried query_disk_change but it returns 1 if called without media inserted (it correctly works if media is present when it is called). I need it for CD-ROMs (IDE or SCSI) and possibly for other drives with removable media like floppy, Zip, Jaz.

So far I tried with two IDE CD-ROMs and floppy and all show the same - query_disk_change always 1 when no media is present.

The reason is I'd like to avoid media access when it is known no media is present. The kernel is 2.4.17.

TIA

-andrej

I have working media change (and presense) detection for the ide-floppy driver, that handles nearly every situation. It will be even better (and handle all situations) when Andre's new IDE driver gets merged into 2.4.x and I can use taskfile I/O to implement some more drive features.

The code is ready to be reviewed, I've asked Paul Bristow to do so but so far haven't gotten any response.

----- Original Message -----
From: "Borsenkow Andrej" <[email protected]>
To: "linux-kernel list" <[email protected]>
Sent: Sunday, January 20, 2002 3:07 AM
Subject: Query removable drives (CD-ROMs, flopies etc) for media presence