Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 23)

Understanding RAID Concepts and Levels
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Figure 7. RAID 50 Configuration Example
Single Disk
You can configure a single drive as a unit through 3ware software. (3BM,
3DM2, or CLI).
Similar to disks in other RAID configurations, single disks contain 3ware
Disk Control Block (DCB) information and the OS addresses them as
available units.
Single drives are not fault tolerant and, therefore, are not recommended for
high availability systems unless you take additional precautions to prevent
system hangs and data loss.
Hot Spare
A hot spare is a single drive, available online, so that a redundant unit is
automatically rebuilt without human intervention in case of drive failure.
(600 GB - 120 GB for parity) (600 GB - 120 GB for parity)
(960 GB - 480 GB for mirror)