> 	EARLY WARNING behaviour enabled is defined as a guarantee that
> 	if early warning (logical EOM) is detected, the tape driver
> 	will ensure that the writing application will be notified by
> 	a 'short' write (non-zero residual). This may be delivered
> 	by either the EOM itself causing a residual, but also may
> 	require the driver to internally 'note' that EOM has occurred
> 	and to terminate the next write immediately with the residual
> 	set to the byte count of that request.

Wait a minute, in the latter case how do you know that it's a residual
and not a complete write?

Maybe I missed something, but it seems that these methods have a slight
problem when your "short write" hasn't written any bytes yet, so the only
'correct' residual would be exactly zero.

Todd Whitesel
toddpw @ best.com