Spanned volume

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A spanned volume is a formatted partition whose data is stored on more than one hard disk, yet appears as one volume. In Windows NT, this is called a volume set. Unlike RAID, spanned volumes have no fault-tolerance, so if any disk fails, the data on the whole volume could be lost. Additionally, the system or boot partitions cannot be included in a spanned volume. FAT, FAT32 and NTFS file systems may be used, and the volume can span up to thirty two hard disks.

Spanned volumes are the equivalent of Concatenation (JBOD) in hardware RAID systems.

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