(from the Windows Administrator's Guide, page 134) IBM 3494 tape categories
Typically, a software application that uses a 3494 library uses volumes in one or more categories that are reserved for that application. To avoid loss of data, each application sharing the library must have unique categories. When you define a 3494 library to the server, you can use the PRIVATECATEGORY and SCRATCHCATEGORY parameters to specify the category numbers for private and scratch Tivoli Storage Manager volumes in that library. If the volumes are IBM 3592 WORM (write once, read many) volumes, you can use the WORMSCRATCHCATEGORY parameter to specify category numbers for scratch WORM volumes in the library. See "IBM Tivoli Storage Manager Volumes" on page 79 for more information on private, scratch, and scratch WORM volumes. -- Mark Stapleton ([EMAIL PROTECTED]) Office 262.521.5627