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JBOD (just a bunch of disks or just a bunch of drives)

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JBOD (for "just a bunch of disks," or sometimes "just a bunch of drives") is an array of hard disks that haven't been configured according to the RAID (redundant array of independent disks) system.
The RAID system stores the same data redundantly on multiple disks that nevertheless appear to the operating system as a single disk. Although JBOD also makes the disks appear to be a single one, it accomplishes that by combining the drives into one larger logical one.
JBOD means the individual disks are presented (to a server) with no amalgamation, pooling or structure applied. The term is in widespread use, especially in the context of computers that have software volume management, such as LVM (AIX, HP-UX, Linux), DiskSuite (Solaris), ZFS (Solaris), Veritas Volume Manager (UNIXes), Windows, and so-on.
Spanning or concatenation is an additional configuration that can be applied by volume managers to combine JBODs into larger logical volumes or LUNs (logical unit numbers).
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