[arch-general] mounting a data dvd fails

[JM]

Hello,

I cannot mount a data dvd.

mount /dev/dvd /media/dvd
mount: unknown filesystem type 'iso9660'

I noticed that isofs module, which provides iso9660 is not loaded in
my system. Inserting it, however, results in:

FATAL: Error inserting isofs
(/lib/modules/2.6.30-ARCH/kernel/fs/isofs/isofs.ko): Invalid module
format

This is an up-to-date non-testing system. Help would be appreciated.

Regards,
JM