A catalog entry that describes a data set that does not use the Virtual Storage Access Method (VSAM). A non-VSAM entry contains the data set's volume serial number (VOLSER) and device type. If the data set resides on a magnetic tape volume, the entry can also identify the data set's file number. When the data set resides on a direct access device, the operating system obtains further information by examining the data set's data set control block (DSCB) in the volume's volume table of contents (VTOC).