Dear Alex, ladquin via Bug reports for ddrescue, data recovery tool. wrote:
First of all, I wanted to thank ddrecue's creators / maintainers for the fantastic tool it is.
You are welcome. :-)
Second, I would like to ask for some help to understand a bit how the block / sector size of a filesystem could affect the performance of ddrescue.
For an errorless, buffered copy (not direct access) like the one you are doing, you may try increasing the --cluster-size to 256 or 512, but most probably the bottleneck is in the sustained writing speed of the destination partition.
At 250 MB/s your drive seems faster than mine (25 MB/s), but not fast enough if your partition has 500 TB (12 days x 500 MB/s).
Best regards, Antonio.
