dd-ing a 250G SSD drive takes ~ 7h10m

 With two 250G SSDs attached via USB3, the following took between 7h and 8h:

# dd if=/dev/sdc of=/dev/sdd

488397168+0 records in

488397168+0 records out

250059350016 bytes (250 GB, 233 GiB) copied, 25271.1 s, 9.9 MB/s


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