temporary working space for SAS sessions. There will be heavy sequential read and write activity of data in this file system. Depending on the SAS tasks, these reads and writes typically could be many small files or several large files. The files written here in SAS Work are only available during the duration of a SAS session and are erased when the SAS session terminates normally. This file system can get the majority of the IO activity. NOTE: if needed, some of the IO pressure associated with the creation of the utility files created by the threaded procedures can be alleviated by pointing the UTILLOC parameter (the utility file system where these files will be placed – the default file system is SAS WORK) to a different file system.