dvdisaster as a complement to quality scans

But quality scans are not a reliable means of predicting the lifetime of optical media.
Consider we are looking for the right time to copy a worn-out medium onto a new one:

• Too early: Copying media because of a bad quality scan is cost-ineffective. Sometimes such media remain readable much longer than expected.

• Too late: When the quality scan reveals unreadable sectors some data has already been lost.

• Right before the medium fails: The ideal case, but how to tell?

• Create error correction data for the medium.

• Scan the medium regularly. Use it until the first read errors occur.

• Recover the read errors using the error correction data. Write the recovered image to a new medium.

Pro and con of dvdisaster at a glance...