checksum failure

[coeng73]

I've backed up many of my DVDs (w/ DVDShrink) in the past and a handful of them gave me a checksum failure. Of those that did, I cleaned the discs with the disk doctor and 80% of the time the problem was fixed.

Now I am trying to make copies of some of my backups (to take them on the road) and I am getting the same error message (so far this has happened on 2 out of 3 discs). The disc surfaces have never been touched. Why is this happening?

[BobK]

Cheap crappy disks?

[coeng73]

i wouldn't consider verbatim cheap crappy disks.
the movies play perfectly without a single glitch.

[Gazorgan]

Incorrect. The movies do play with a glitch, you just don't notice it. DVD's were designed to not barf from a scratch (they just keep going, joys of LBA). Scratch or corrupt data packet, it's all the same.....doesn't matter when you play the DVDR on a settop player.

It's totally different when you try and copy a DVD. Since no copy programs copy CSS disks (they physically can't and get a working copy), they assume the disk isn't encrypted. This means they do a data copy. This means they barf when they hit a read error (scratch or bad data packet). You can get a bad data packet from a piece of lint during the burning.

So: Don't use Disk Copy. 'Rip' the disk with DVDDecryptor(ignore errors) in ISO mode, then write back to a new DVDR, works every time!! (just takes a few extra minutes to rip).

[coeng73]

Can you specify which DVD Decryptor settings I should use other than specifying ISO mode and Ignore Read Errors?

If I do ISO mode, do I end up with one file, an ISO image?