CCampbell wrote:Hi Eric,
To be honest, I'm not aware of any CD or DVD Recording software that offers to pickup where you left off when doing a Backup of this nature, or to restart the last DVD backup if it fails due to poor media.
I can check to see if its even possible, but I know it will not be an easy implementation.
Craig and I had a PM exchange that I thought would be interesting to others, so he kindly let me post it here:
EWoudenberg wrote:Hi Craig -- Thanks for your help. Perhaps we could take this discussion offline. I don't wish to complain in public. Actually I don't want to complain at all, I just don't understand how a backup program can not have facilities for handling media errors during backup. If you're backing up a 300GB partition to 75 DVDs (something I was planning on doing), don't you have a reasonable chance that you'll encounter some kind of media problem? I thought that was the whole point of the verification step -- that you could detect problems and recover from them during the backup process. Maybe I'm missing something, but I don't quite follow how large scale backup is supposed to work without such a feature. -Thanks again, Eric
CCambell wrote:The probelm is the format standard being used.
For Example: If you are burning a CD, if there is an error in the process, you have a coaster. There is no way for it to recover from such an operation. The 'Track-At-Once', 'Disc-At-Once', and 'Session-At-Once' format standards just do not offer any way for it to detect the problem and then prompt you for another disc so that it can try again.
The only way this is possible is with "Packet Writing'. But if you read up on Packet Writing in the forums, it's not very reliable, as data eventually is not able to be accessed after a period of time.
We have to use for standard that is reliable once written to disc, and that is the 'Track-At-Once' standard.
Believe me, if it was possible, we would do it.
For what you ask, this is only possible if you are writing to the Hard Drive or to a Tape drive. But not to CD, DVD or DVD-RAM media.
Thanks Craig -- unfortunately I think I'm not being clear. I'm not trying to avoid making a coaster -- that's life if the DVD really does have a flaw. What I'm interested in is not having my entire backup process fail (making a dozen coasters!) because I encounter one DVD with a surface flaw partway through.
My observation is that Nero Backitup writes a complete DVD, then before going on to burn the next, verifies the current one by reading
it and comparing it with the data it just wrote. What I'm asking is that Backitup detect when the data it wrote is bad (which it does today) and then offer to burn the data it was using in the verify step
onto a new DVD (which it would then verify, and if successful, proceed to burning the next DVD).
Doesn't this seem like it should be straightforward?