Hi
‘ddrescue –direct’ will open the input with the O_DIRECT option for uncached reads. ‘raw devices’ are not needed on newer kernels. For older kernels see below.
First you copy as much data as possible, without retrying or splitting sectors:
ddrescue -f -n /dev/hda1 imagefile logfile
Now let it retry previous errors 3 times
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, using uncached reads:
ddrescue -d -f -r3 /dev/hda1 imagefile logfile
If that fails you can try again but retrimmed, so it tries to reread full sectors:
ddrescue --direct --retrim --max-retries=3 /dev/hda1 imagefile logfile
Example 3: Rescue an entire hard disk /dev/sda to another disk /dev/sdb
copy the error free areas first
ddrescue -n /dev/sda /dev/sdb rescue.log
attempt to recover any bad sectors
ddrescue -r 1 /dev/sda /dev/sdb rescue.log
Michael