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The -l flag sends only the READ CAPACITY (16) sevice action. Normally we send the READ CAPACITY (10) command, and only send RC16 when the capacity is larger than 2TB (since that's the max RC10 can report). However, some badly programmed drives report different numbers for RC10 and RC16. This can be hard to diagnose, but generally there's a "Logical block address out of range" error when RC16 reports a larger number than RC10 and the RC10 number is the correct one. By comparing the output of readcap with and without the -l argmuent, one can determine if there's a mismatch and if the DA_Q_NO_RC16 quirk is needed. Reviewed by: ken@ Differential Revision: https://reviews.freebsd.org/D19536
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