Hi,
Yes it's possible to write on cartridge one generation back, and to read two 
generations but it's not exactly my question.

I found this redbook, very interesting and accurate but not my answer
The IBM TotalStorage Tape Libraries Guide for Open Systems SG24-5946-02

Is it possible (which constraints) to read (maybe write) with LTO2 drives,
LTO2 cartridges written with LTO3 drives (using LTO2 format?) ? 

Thanks
Christian Bagard
SOS-Restore - Aix-en-Provence - France


-----Original Message-----

My understanding is on LTO, that they should be able to read and write
down one level of LTO.  This will usually entail a performance hit too,
but at least it should work.  

As far as documentation... Sorry, I don't remember where I go it.
---------------------------------------------------------------------------------------