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another useful article
Authored by: kwanghui on Oct 22, '06 05:54:10PM
gnu ddrescue is fantastic and has helped me recover critical data on many occasions.

To add to this:
1. it also works with floppies and cdroms. i have used it to recover data from floppies with mould growing and damaged by water, from cdroms that were scratched, etc.

2. the "--reverse" option is often quite useful as it allows you to read backwards from the end of the media. I have found this useful with scratched cdroms, as well as some hard disks with bad sectors. in addition you can define an offset to start seeking from, using the "skip" option

3. this website has some useful info clarifying the difference between dd_rescue, ddrescue and dd_rhelp

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