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Re: [Bug-ddrescue] DDRESCUE examples in the GNU website + 1 kind questio
Antonio Diaz Diaz
Re: [Bug-ddrescue] DDRESCUE examples in the GNU website + 1 kind question
Fri, 07 Oct 2011 18:17:30 +0200
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Roberto Gini wrote:
thank you so much for your work with ddrescue.
You are welcome. :-)
why don't you add a specific example and sequence for the case "cloning a
drive with a lot of bad sectors" ?
Ddrescue can manage any number of bad sectors without special options.
Of course an experienced user can shorten rescue time, but it depends on
the drive's behaviour and I don't think any single example can cover all
BTW, have you looked at the example shown here
Additionally, I'd like to ask you why don't to implement a user definable *skip
ahead size amount* *and read backward* , in case of bad sectors
Ddrescue already skips ahead an exponentially growing amount depending
on rate and error history. It totaly skips an unreadable 1.44 MB floppy
in 8 seconds. I don't think the skip value needs to be made any larger.
Reading backwards is much slower than reading forwards. So jumps should
not be too large, and all trimming is best done in a second pass.
P.S. there are some drives that are recognized nice by the BIOS, they do not
make bad noises but as soon linux or windows starts effectively to boot,
such drives (either if connected on secondary channels) hangs the windows
boot. It would be nice to have a ddrescue like tool interfacing directly
with the ATA interface. Do you know something similar out there? Have you
ever thought about this?
As far as I know, ddrescue doesn't run on windows so, as long as the
drive does not hang the linux boot, this is not a problem. About using
interfaces directly, I have already decided not to do it.