CMS identifies a SAS file as it does all files, with a three-part name consisting of the filename, a filetype, and either a filemode or an SFS directory identifier, for example, TASTEST MYLIB A1. SAS ...

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 ...