Richard Neill wrote:
I'm slightly confused here. I've just (successfully) managed to recover my read-error-prone disk with dd_rhelp, and am trying to write a quick summary for my webpage. Can someone here explain to me a few things;

1)is ddrescue (GNU) related to dd_rescue:


2)which supersedes which?

GNU ddrescue offers the functionality of dd_rescue + dd_rhelp plus some more.

3)Does ddrescue need dd_rhelp?  Does it do the same thing?

No. I have never used dd_rhelp, but I am been told that GNU ddrescue is less buggy and does far better accounting of errors that dd_rhelp (among other things).

4)The algorithm in the ddrescue info page isn't quite clear.
In particular, if the file is not completely recovered, does it write zeros to the places where there are damaged blocks, or is the output file left with missing bits?

GNU ddrescue writes zeros to the places where there are damaged or non-tried blocks, but may skip non-tried blocks at the end of the file. In this case the output file is smaller than the input file until you try the last block.

Antonio Diaz.

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