growisofs - burn the file again?

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I am using growisofs to burn DVD's. After burning a file I do diff to see if it was burned properly. If there is an error I try to burn the file again using growisofs.
I think growisofs sees that the file is already there and does not try to
burn it again. So when I do diff after re-burning I see the same error in
the same location. Is there a way to force growisofs (which actually uses
mkisofs) to re-burn a file that has the same name as a file that is already
on the DVD?
My command looks like this:

$growisofs -quiet -use-the-force-luke=tty -use-the-force-luke=notray -M
/dev/dvd -r -J -T datafiletoburn.dar

Also, what is the best way to erase DVD+RW disks? I do not need to wipe all of the data, just clear the file system tables so the disk can be re-used. I am using:
dvd+rw-format -force /dev/dvd

But I read that this is not good for the media. It may damage the DVD+RW after erasing it a few times? Is there a better way?
TIA

-------------------------------
Dave M
Davem (at) Mich (dot) Com
Ann Arbor, Mich. USA

Inter-networked computers give you freedom.
The "Trusted Computing Platform" could take that freedom away.
http://www.eff.org/Infrastructure/trusted_computing/20031001_tc.php


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