> Has anyone used an LTO-4 tape drive to read an LTO-2 tape ?? 


As already stated, it should be ok.  Just make sure that the environment is 
able to read the tape record size...  aka. block size settings.

This is usually more an issue with Windows where you have to set the upper 
limit on maximum block size.

I have seen where, for example, the the current maximum block size is smaller 
that what was set when writing data on the old tapes.  In this case you will 
have problems reading the data unless you increase the Window's device 
controller max block size to be the same or higher than what was used for the 
old tape.

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