As I understand it, LTO tapes write data in "wraps", where the first wrap unspools the tape into the drive, and the second wrap spools it back into the cartridge. This process is repeated a number of times, with the idea being that once the end of the tape has been reached, all the tape will be back in the cartridge and it can be ejected with little rewinding.
However I have noticed that when you get to the end of a tape, the drive sounds like it is about half way through the final wrap, and so the drive spends some time rewinding the tape before ejecting it, even though it has reported that the end of the tape has been reached.
Is this because there is some reserved capacity on the tape, to allow for things like rewriting failed blocks or to skip over bad sections of tape without reducing total capacity? Or is there some other reason for this apparently early finish of the tape?