cannot eject cdrom after burning dvd (2nd time)

Setup: RH ES3, Pioneer 109 DVD-RW installed on a Dell server

I'm trying to setup a backup script which burns to a dvd. The backup
process
works well (in that it creates a backup with the correct contents on
the dvd),
except that after the **second** time running it, the drive is no
longer accessible,
can't be mounted and the cdrom module cannot be unloaded.

The backup script comprises essentially two commands:
dvdrecord blank=fast dev=4,0,0
and
growisofs -dvd-compat -Z /dev/cdrom -R -J -V file directory

the media being used is a sony DVD-RW.

Any help in sorting this out will be greatly appreciated - I do not
know where
to look.

Cheers,

Bonny

.

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