Disk speed

I don't know if this makes sense. In fact, I'm pretty sure it doesn't. Writing 10 GB to a WD Green 2.0TB drive in a NexStar CX USB 3.0 enclosure connected to an ASUS Z8NA-D6C.

# time dd if=/dev/zero of=/dev/sdc2 bs=1024k count=20480

20480+0 records in

20480+0 records out

21474836480 bytes (21 GB) copied, 704.374 seconds, 30.5 MB/s



real    11m44.375s

user    0m0.029s

sys     0m21.517s

Same operation on an ASUS M2N-MX SE with "only" 4 GB of RAM:

# time dd if=/dev/zero of=/dev/sdb2 bs=1024k count=20480

20480+0 records in

20480+0 records out

21474836480 bytes (21 GB) copied, 847.95 seconds, 25.3 MB/s



real    14m7.969s

user    0m0.335s

sys     7m17.540s

Mind you, Xorg is running also, so that takes up RAM and CPU.