Be more conservative in using READ CAPACITY(16) command. Previous code checked PROTECT bit in INQUIRY data for all SPC devices, while it is defined only since SPC-3. But there are some SPC-2 USB devices were reported, that have PROTECT bit set, return no error for READ CAPACITY(16) command, but return wrong sector count value in response.
Be more conservative in using READ CAPACITY(16) command. Previous code
checked PROTECT bit in INQUIRY data for all SPC devices, while it is defined
only since SPC-3. But there are some SPC-2 USB devices were reported, that
have PROTECT bit set, return no error for READ CAPACITY(16) command, but
return wrong sector count value in response.

MFC after:	3 days

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