Using command and data chaining, you can write a whole cylinder with a
single EXCP. That enough?
You can write a whole extent as far as I understand it if you want to.
(EXCP automatically executes a Define Extent based on the initial seek
address you give it, and whilst it doesn't say so explicitly in the
documentation (which in itself is annoying) I would expect that what it
does is issue a Define Extent for the whole extent containing the
address you request. Doesn't seem a whole lot of point making it smaller
than that since the only point is to enforce security of the disk).
But that in itself isn't enough to explain what is reportedly the EXCP
usage of this other product. In order to do that it would need to keep
the entire content of the file in memory for the life of the program and
then write it out once at the end using one big channel program.
But anyway. That's a side issue.
I'm using EXCP because I need to.
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