uranus xen # sync
uranus xen # dd if=/dev/null of=/dev/sdc bs=1 count=400
0+0 records in
0+0 records out
0 bytes (0 B) copied, 2.5887e-05 s, 0.0 kB/s
uranus xen # sync
uranus xen # head -c400 /dev/sdc
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