Source: ST10000DM0004
Destination: ST10000DM0004
dd - 247MB/s
PC3K-Portable (direct) - 238MB/s
MRT - 220MB/s
PC3K-Portable (USB) - 190MB/s
RapidSpar - 144MB/s
PC3K-Express - 130MB/s
* Assuming that PC3K-Portable uses a default of 4096 in the read block size, the top 4 faster systems were reading the larger size, while the others are using 512 (an aassumption for RapidSpar)
** I missed getting DeepSpar Disk Imager added, but I think it is safe to say that it would likely be the slowest of the systems, when dealing with healthy drives.