copying a disk with ignoring errors

Christoph Kukulies kuku at
Tue Jan 5 15:32:46 UTC 2010

I recall a case when I had a hard disk that had got bad sectors and it 
wasn't accessible through normal mounting anymore.
Then a tool came into the game that - I believe - Poul Henning had 
recommended or written for this purpose.

It copies a disk sector by sector to a file (kind of dd), but ignores 
errors, it just skips sectors it couldn't read (after a couple
of retries). The result was, that one had a - albeit - worm-eaten - 
image of the disk allowing to access the filesystem
and getting to the important files with a little luck these not being 
amongst the corrupted data.

Anyone knowing what this little tool was named? Something like diskcopy, 
devcopy, I forgot.


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