|  |  | dvdisaster as a complement to quality scansQuality scans, e.g. C2 error or PI/PO scans are a valuable 
tool for testing the results of the media writing process.
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:
 
However, we could do it the dvdisaster way: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?
 
Pro and con of dvdisaster at a glance...
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