>My 3494 is filled with 3590E carts.

Well, you have something I've never seen...  I know about 3590J tapes, and
3590K tapes, but never seen a 3590E tape.  ;-)

>If I were to start introducing the longer format carts into my system,
>would TSM use them interchangeably with the old ones, i.e., would
>reclamation write 2 Es on a K and 1/2 a K on an E, or would I have to have
>two separate device classes?

Conceptually, yes.  But you would need 3590E drives for the K tapes.

  Richard Sims, BU