I've seen simular problems with a mixed SDLT and LTO library. Legato 
simply would not mount a tape when it could not read the barcode of the 
tape in a mixed environment. The barcode ends with the type of tape (S = 
SDLT, L2 = LTO2, etc.). 

In my case I was performing a disaster recovery test at a DR service 
provider and had to use their library (StorageTek). We used barcode labels 
compatible with HP MSL5000 series libraries, which could not be read by 
the StorageTek library. As such Legato (v6.1.x) could not obtain the 
barcode information from the library and refused to load a tape. We 
replaced our barcode labels with standard ones, after which the problem 
was solved (ofcourse the digital label did not match the barcode label, 
but that was not a problem)

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