dvdisaster Version 0.72.4 / 0.72 (pl4) | To the Internet version

Contents

News
Overview
· | Examples of the error correction
· | dvdisaster complements quality scans
· | Pro and con of dvdisaster
Howtos
Download
Questions and Answers
Bug reporting

### dvdisaster as a complement to quality scans

Quality 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:

- 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?

However, we could do it the dvdisaster way:

- 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...

Copyright 2004-2012 Carsten Gnörlich. Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.