Hello, 
I think you have to be 64 bit on the server you are going to read the 
tapes, if you are just reading the tapes , you might be able to force one 
of the tape drives to be 64 bit and read it.
Best practice in the mixed inviroment is to be compatable with each other 
if possible, Windows support 64 bit, so i am not sure why linux was left 
at 32 bit ?
The OS is irespective of what the drives are doing, i have windows 2003\64 
bit install on which drives are writing at 64 Bit and 2003\32 bit server 
SN which writes to the devices at 64 bit also, check the properties of 
your devices you will know.

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