thanks vschumpy,
it's not a single tape drive, but now i've only one dlt for every job (in a future i will prepare a pool for all jobs). Then i need to change it.
Like you say, appers a dialog box on the server ARCserve, but one of my questión is if i must to export the DLT from the library directly because i can't do it from de ARCServe interface.
Now, i stop the job to change the DLT from the ARCServe interface, change the DLT, Format, and restart de job, but the job that i have stopped before is incompleted. I need to continue the job without stop.
Thank you very much.
Sergio Sanchez