I have found a workaround for me by reading the full allocated file and
then using truncate to cut the file to proper length, although this
reads a few extra sectors. But I would think that ddrescue should try to
read a whole sector and only write what is asked of, as opposed to not
try at all. I am not sure what you mean by domain fragmentation though.
On 11/28/2012 2:54 PM, Antonio Diaz Diaz wrote:
Hello Scott,
Scott Dwyer wrote:
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.
I thinh it is the nature of direct disk access. The kernel does not
accept such partial sector reads.
Of course partial reads could be faked by reading the whole sector and
writing only the requested part. AFAIK neither linux nor glibc
implement this with direct disk access. I am not sure if it would be a
good idea for ddrescue to implement it or not. It may mean reading the
same sector more than once in extreme cases of domain fragmentation.
But I guess such domains are even less normal that what you are doing.
:-)
Regards,
Antonio.
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