Encrypted USB 2.5" to unencrypted internal 3.5" hard drive copy speed

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http://unix.stackexchange.com – I am moving data from an external USB 2.5" hard drive (encrypted with cryptsetup) to an unencrypted internal 1TB 3.5" hard drive on a GNU/Linux quad-core headless server with 2GB RAM, using Midnight Commander over an SSH connection. The USB drive is connected directly to the server; I am not copying data over the SSH connection. Copying speed, according to Midnight Commander, is maxing at around 950 KB/s. Is this very slow? I'm sure it should copy faster than that? Less than 1MB/s is very slow? The machine, which is otherwise idle, has a load average now of over 2.0. I am moving the files ac (HowTos)