Back to the original question, I don't think Sagi was
asking if it was valid to do a legacy/unprotected READ,
it was what to expect with a protected READ on
unwritten blocks:
> So this takes me to a corner I still don't understand, if
> a LUN is pre-formatted as T10-protected, what happens to
> unwritten blocks read?
So the precise answer is: the PI will be all 0xff bytes,
unless logical provisioning is enabled, LBPRZ=0 and the
device's compliance predates sbc3r34.pdf (November 2012).
Doug Gilbert