A spanned volume is a formatted partition which data is stored on more than one hard disk, yet appears as one volume. In Windows NT, this is called a volume set.

Spanned Courses - Full courses that are taught over both terms. Courses taught over two terms of study are referred to as ?spanned? courses.

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Last time I explained the basic premise of a spanned set.  I used the example of a clients RAID that contained 3 36 GB SCSI drives. In a standard set each

... span of a set S (not necessarily finite) is defined to be the intersection W of all subspaces of V which contain S. W is referred to as the subspace spanned by S, or by the vectors in S.