Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 261)

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APPENDIX
Important:
RAID level 00, 100, 30, 50 and 60 can support up to eight
RAID set. If volume is RAID level 00, 100, 30, 50, or 60, you
can’t change the volume to another RAID level. If volume
is RAID level 0, 1, 10(1E), 3, 5, or 6, you can’t change the
volume to RAID level 00, 100, 30, 50, or 60.
JBOD
(Just a Bunch Of Disks) A group of hard disks in a RAID box are
not set up as any type of RAID configuration. All drives are avail -
able to the operating system as an individual disk. JBOD does not
provide data redundancy.
Single Disk (Mirrored Pass-Through Disk)
Pass-through disks are attached to a RAID controller and operate
as if they were attached to a non-RAID controller. No RAID
configuration structure is stored on these physical disks. This
feature is primarily targeted for users moving physical disks
containing data from non-RAID controllers to RAID controllers.
The disk is available directly to the operating system as an
individual disk. It is typically used on a system where the
operating system is on a disk not controlled by the RAID controller
firmware. A mirrored pass-through mode means controller will be