We have 4 LTO1 and 2 LTO3 using different device classes in our 3484, FORMAT=ULTRIUM*, unpartitioned. Never had any problems moving data from LTO1 to LTO3 or vice versa, using the "move data" command. TSM does not seem to use LTO3 drives to read LTO1 though. One NAS device class was specified with FORMAT=DRIVE (following the docs) but I have never seen any confusion over this matter, it always used LTO3 for those tapes.
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