Fix the "wd" count stat.  The seek and xfer stats are still very bogus for wd (they both count the number of sectors).  The wpms stat is still moderately bogus for all drivers.  Even the count stat could be handled better (partial blocks should be counted as full blocks; should errors and retries be counted?).
Fix the "wd" count stat.  The seek and xfer stats are still very bogus
for wd (they both count the number of sectors).  The wpms stat is still
moderately bogus for all drivers.  Even the count stat could be handled
better (partial blocks should be counted as full blocks; should errors
and retries be counted?).

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