To write a disk-format SAS file, you usually need only to specify the two-level filename in the appropriate SAS statement. That is, in most cases you do not need to assign a libref to the file because ...
For Version 8, four tape engines are supported: V5TAPE (READ-only), V6TAPE, V7TAPE, and V8TAPE. Specifying only TAPE defaults to the current release. Using the LIBNAME and FILENAME Options for Tape ...