It appears that the Read Sectors Without Retries command (21h) may in fact
be nonfunctional even though it is "supported". :-(
Section 11.23 on page 168 of the following Hitachi manual states that the
retry bit is ignored:
http://www.hgst.com/tech/techlib.nsf/techdocs/6487C1BF0107A2E58825781D0033EE6E/$file/DS7K3000-2TB_andUnder_OEM_manual_1.2.pdf
-Franc Zabkar
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