11. Others have a small number of logical units that correspond to separate physical devices and have fixed LUNs. 12. Labels or serial numbers stored in a logical unit's storage volume often serve to identify the logical unit . 13. Labels or serial numbers stored in a logical unit 's storage volume often serve to identify the logical unit. 14. There was a need for a stable standard for organizing data on compact disks into logical units such as files. 15. It usually provides just a single target, which in turn usually provides just a single logical unit whose LUN is zero. 16. The copy source and destination devices are logical units that may reside in different SCSI devices or the same SCSI device ." 17. An extension of this was to group sub-elements of the shape into logical units called " geometric features ", or simply " features ". 18. A transaction is logical unit of work that comprises one or more SQL statements, usually a group of Data Manipulation Language ( DML ) statements. 19. DCE / DFS also divorced the concept of logical units of management ( Filesets ) from the underlying volume on which the fileset was stored. 20. The scalar portion of the system consisted of an add unit, a logical unit , a population count, a leading zero count unit and a shift unit.