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Rob--It's the +/- XX% manufacturing tolerances-- That's why duplicating a backup that spans more than one tape (DUPTAP) requires starting at tape 1 and proceeding thru the volumes-- no fair duplicating 2 tapes on 2 separate tape drives!
It's also the compression/compaction of your data; how much 'air' can be compressed out of it.
It's also the number of files you're writing to the tape-- each file has headers, trailers, tape marks, etc. associated with it, plus inter-file spaces. These can add up and change the apparent capacity of the tape.
--Paul E Musselman PaulMmn@xxxxxxxxxxxxxxxxxxxx
It's kind of weird. Some tapes (same format, make, manufacturer, etc) seems to hold more before the next tape is loaded. Could be quite significant. And I suspect that a manufacturer does a reasonable job of having the same length of tape on every cartridge - give or take only a small manufacturing variance. I wonder if the figures quoted on the report are data before compression and/or compaction by the device. And some data compresses more. Rob Berendt
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