I do not know if this would be considered a bug, or just the nature of
the direct disk access. When using the -d option, ddrescue will not
attempt to read data that does not start or end on a sector boundary.
Meaning if you pick a start byte with the -i option that does not line
up with the beginning of a sector, it will not even try to read that
partial data and will report a failed read for that chunk. This will
also happen if you pick a length with the -s option that does not end
exactly on a sector boundary. It will work fine without the -d option.
This may not be something normally encountered, but then again I am not
doing normal things. I have a friends failing hard drive that reads much
faster with direct disk access. And I am trying to write and test
software to extract individual files using ddrescue, with some actual
success so far. This means I will be attempting many reads that do not
end on a sector boundary.
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