problem buring iso to external usb dvd

[Kevin D. Clark]

I'm looking for ideas as to what I might be doing wrong with burning
ISO images to DVD.  I can burn data DVDs just fine in my setup but ISO
images don't work.

Details:

Linux 2.6.15-1.2054_FC5 #1 Tue Mar 14 15:48:33 EST 2006
Fedora Core release 5 (Bordeaux)
dvd+rw-tools-7.0-0.fc5.4
LITE-ON USB 2.0 External DVD Burner Model SHW-160P6SU
Media: various Ridata and Maxell DVD-R and DVD+RW disks

This writes a DVD successfully; I can read this on other machines:

  $ growisofs -dvd-compat -Z /dev/dvd -R -J -pad some_directory

This fails:

  $ growisofs -speed=1 -dvd-compat -Z /dev/dvd=F-7-i386-DVD.iso
  Executing 'builtin_dd if=F-7-i386-DVD.iso of=/dev/dvd obs=32k seek=0'
  :-( write failed: Input/output error


Running as root doesn't help (non-sudo, BTW); I've tried specifying
various other devices in /dev and this doesn't help either
(/dev/dvdwriter, /dev/scd0, /dev/dvdrw-sr0).


Any hints as to what I am overlooking would be appreciated -- thanks!

--kevin

PS  I'm not going to be able to get back to this system until later
    tonight.

-- 
GnuPG ID: B280F24E              God, I loved that Pontiac.
alumni.unh.edu!kdc                   -- Tom Waits