Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 264)

APPENDIX
264
30 RAID 30 is a combination multiple RAID
3 volume sets with RAID 0 (striping)
6 Up to one disk
failure in each
sub-volume
50 RAID 50 is a combination multiple RAID
5 volume sets with RAID 0 (striping)
6 Up to one disk
failure in each
sub-volume
60 RAID 60 is a combination multiple RAID
6 volume sets with RAID 0 (striping)
8 Up to two disk
failure in each
sub-volume
Pass-
Through
Disk
Pass-Through disk is 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.
1 No data
Protection
Pass-
Through
Disk
Dual pass-through disks mean "save
two copies of the data such that you
can survive one disk failure and still
have everything."
2 Up to one disk
failure
Pass-
Through
Disk
Triple pass-through disks mean "save
three copies of the data such that you
can survive two disks failure and still
have everything."
3 Up to two disks
failure