Any way to recover an ISO from a damaged disc?

[Number Cruncher]

I have a 42 gig BD-ROM.

 

It's damaged. When creating the ISO, it failed at 41 gigs. I chose not to delete it.

 

I exchanged the disc. The new disc has the same ID's and sector / byte size.

 

Can't I pick back up reading the disc at 41 gigs, then verify? Do I really have to re-copy the first 41 gigs?

[mmalves]

If you continued the ISO read then verified you'd read 1GB (to finish the ISO) then all 42GB again to verify the ISO image against the source disc. By starting from scratch you'll still save time.

[Number Cruncher]

I verify ALL burns, so I had to read 42 GB then verify 42 GB, as opposed to read 1 GB then verify 42 GB.

 

Seems like it should be possible to continue reading an incomplete ISO.

[LIGHTNING UK!]

But you can't so just read the whole thing again. It's only another 30 mins and you've probably wasted more than that here on the forum.