> Well, in my opinion....
> 
> >  i.e. a drive that
> > reads/writes two media types;
> 
> Very, very rare, to the point of being almost non-existant in 
> the open systems world. Occurs occasionally in the mainframe 
> world with 3480/3490 media (same physical tape cartridge, but 
> R/W density, format and compression controlled by commands to 
> the tape transport).

Just after I hit enter, I realized that CD and DVD media fit into this
category. So, take my earlier answer for tape only.  I still think the
suggestion I made at the end of the earlier note would work for this
scenario as well, though. 

> I think the optimum general case would be to specify multiple 
> read formats and one write format per drive. That way, any 
> eligible drive in an autochanger could be used for restores, 
> and updates would be done only on devices that could reliably 
> write the desired format. In the case of multiple drives that 
> can read or write only one format, then the read format list 
> would contain only 1 format, and the write format list would 
> contain only one format.


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