How to treat iostat?

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http://forums.fedoraforum.org – Hello I wanted to zero my USB key drive and I type folloing command: Code: # dd if=/dev/zero of=/dev/sdd So, after a while I call iostat Code: iostat  -m sdd Linux 2.6.32.x86_64    08/01/2012      _x86_64_        (16 CPU) avg-cpu:  %user  %nice %system %iowait  %steal  %idle           0.05    0.02    0.35    1.31    0.00  98.27 Device:            tps    MB_read/s    MB_wrtn/s& (HowTos)