> The blocksize problem may be related to the fact that one of the tape drives 
> is LTO-2 and the other one is LTO-3.


This may be true only of the drives are controlled by different type of 
controllers.  The block size settings are done in the registry setting for the 
scsi controller that is used.   You can have lto-2 and lto-3 on the same 
controller, and the block size maximum for that controller would apply to both.

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