problems mounting a DVD

David Syphers dsyphers at
Sun Aug 21 04:32:41 GMT 2005

On Saturday 20 August 2005 06:32 pm, Garrett Cooper wrote:
> David Syphers wrote:
> >On Friday 19 August 2005 08:57 pm, Roshan wrote:
> >>On 8/19/05, David Syphers <dsyphers at> wrote:
> >>>I'm trying to mount a DVD+RW disc on my DVD-ROM drive, and not
> >>>succeeding. Trying either 'mount_cd9660 /dev/acd1 /cdrom1' or 'mount -t
> >>>udf /dev/acd1 /cdrom1' results in an 'Input/output error'. I've never
> >>>tried mounting DVDs on this drive before, but I play DVD movies on it
> >>> all the time, so I assume the problem has something to do with file
> >>> systems. Any ideas?
> >>>
> >>>Thanks,
> >>>
> >>>-David
> >>
> >>What does dmesg show at bootup ?
> >
> >I should have mentioned:
> >
> >acd1: DVDROM <TOSHIBA DVD-ROM SD-M1502/1816> at ata1-slave UDMA33
> >
> >and
> >
> >FreeBSD 5.4-STABLE FreeBSD 5.4-STABLE #0: Wed Jul
> > 27 20:38:09 PDT 2005
> >root at  i386
> >
>     DVD movies do not need to be mounted; only data DVDs.

Right, which is why I thought the problem is with file systems rather than the 

>     Also, the majority of data DVDs are in UDF format, so make sure that you 
>  can mount UDF files.

I should be able to. As I said, I'm running 5-STABLE, which has mount_udf.

>     See if you can increase the verbosity of the mount at all.

yggdrasil# mount_udf -v /dev/acd1 /cdrom1
mount_udf: /dev/acd1: Device busy
yggdrasil# mount_udf -v /dev/acd1 /cdrom1
mount_udf: /dev/acd1: Input/output error

It doesn't seem so, unfortunately. Are there tricks to get more verbosity?

When I first put the disc in the access light flashes on and off for a while, 
and I get the 'Device busy' error during this time. After a while the access 
light just stays on and I get the I/O error. (With a CD or movie DVD, the 
access light will flash and then turn off until something is mounted/played.)


"What's the good of having mastery over
cosmic balance and knowing the secrets of
fate if you can't blow something up?"
-Terry Pratchett

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