DVD Disk Detection

DVD Disk Detection

[Kernel Related Emails]

I was just wondering if anyone had any suggestions to check to see if a
DVD is in a users DVD drive.  Currently if you run a CDROM_DISC_STATUS on
a DVD you get a CDS_DATA_1 returned.  What kernel level call would
destinguish between an actual Data CD and a DVD?

Thanks,
Kris Kersey
kernel@linuxhardware.org

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Re: DVD Disk Detection

[H. Peter Anvin]

Followup to:  <Pine.LNX.4.21.0101291759200.6259-100000@penguin.linuxhardware.org>
By author:    Kernel Related Emails <kernel@penguin.linuxhardware.org>
In newsgroup: linux.dev.kernel
>
> I was just wondering if anyone had any suggestions to check to see if a
> DVD is in a users DVD drive.  Currently if you run a CDROM_DISC_STATUS on
> a DVD you get a CDS_DATA_1 returned.  What kernel level call would
> destinguish between an actual Data CD and a DVD?
> 

Why does it matter?  Seriously, do you have any reason to act
differently between a CD and a small DVD, either of which contains a
UDF filesystem?  If not, don't.

Size, type of filesystem, etc, are obviously important -- but
shouldn't be determined by the type of the physical media.  It's
perfectly legitimate to have a large ISO 9660 filesystem on a DVD, or
an UDF filesystem on a CD.

	-hpa
-- 
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"Unix gives you enough rope to shoot yourself in the foot."
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