The se-spec placeholder represents the number of a storage element in a tape library.
[se]n | none | vacant
where n is a number ranging from 1 to the maximum number of storage elements in the library.
Elements are referenced by their abbreviation (se) followed by the number of the element, for example, se5. When there is more than one element of a particular type, element numbering starts at 1. When there is only one element of a type, you can omit the number: se1 and se both refer to the first and only storage element. If you omit the abbreviation, then a storage element is assumed. For example, se4 and 4 both refer to the fourth storage element.
Indicates no storage element.
Indicates any empty storage element. Specify vacant only if the tape drive is known to be loaded.