# dd if=/dev/zero of=6G bs=1M count=6144
6144+0 records in
6144+0 records out
6442450944 bytes (6.4 GB) copied, 136.176 s, 47.3 MB/s
# dd if=6G of=/dev/null bs=1M
6442450944 bytes (6.4 GB) copied, 93.6363 s, 68.8 MB/s
Also they have a nice battery connector, they'll keep the battery charged and switch to it if main power fails (and even keep the SATA drive powered (not sure if you plug a 3.5" one, though)).