Description of problem:
This worked in RHEL4U6. Neither k3b nor growisofs used independently can successfully burn valid DVDs from ISO images under RHEL4U7 although CDs work fine (even when burning the same ISO image).

If you select "verify written data" in k3b when burning a DVD, when it finishes burning and checking the DVD, it will report "The written data differs".

K3b uses the following growisofs command:
/usr/bin/growisofs -Z /dev/hda=<ISO file> -use-the-force-luke=notray
-use-the-force-luke=tty -speed=4

The version of k3b in RHEL5.2 uses this command, so I tried it also:
/usr/bin/growisofs -Z <ISO file> -use-the-force-luke=notray 
-use-the-force-luke=tty -dvd-compat -speed=4
-use-the-force-luke=bufsize=32m

Both growisofs commands produced the same result as using k3b: once the image has been burned, if you do cmp <ISO file> /dev/hda, you get
cmp: EOF on <ISO file>

Burning CDs works fine (even if you burn the same ISO image).


Version-Release number of selected component (if applicable):
k3b and growisofs in RHEL4U7.


How reproducible:
Always


Steps to Reproduce:
1. Attempt to burn an ISO image to a DVD using either k3b or growisofs.
2. cmp the original file with the media you just burned.

  
Actual results:
The media you burned is not valid. It appears to be longer than the original ISO file.


Expected results:
Should work (used to work). The burned image should be identical to the original file.

Additional info:
This is unlikely to matter... the DVD burner I am using is a Matshita DVD-RAM UJ870PC IDE DVD burner, and it is connected via a PIIX.