>30 is the best guess I can find...
>From my notes:
Ultrium cleaning cartridge The IBM LTO Ultrium Cleaning Cartridge
is valid for 50 uses only: the
cartridge's LTO-CM chip tracks the
number of times that the cartridge is
used. If you insert a cleaning
cartridge when the drive does not need
to be cleaned or if you insert a
cleaning cartridge that has expired, the
drive will automatically eject the
cartridge.
Ref: 3580 Ultrium Tape Drive Setup,
Operator, and Service Guide
Richard Sims, Boston University Office of Information Technology
