Rosewill R2-RAID - Manual (Page 13)

Server RAID System [ R2-RAID ] User Manua
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RAID 0 (Fast) ：It’s a combination of two physical partitions, where the data
is striped between them. It presents the best data speed but no data
redundancy.
Two unequal hard drives ：The capacity is double of the smaller hard drives.
Two equal hard drives ：The capacity is equal to the sum of both hard drives.
Drive A
250GB
HD3206SRD
Port 0 Port 1
Striping across
disks
Drive B
250GB
Fast
500GB
Drive A
250GB
HD3206SRD
Port 0 Port 1
Drive B
750GB
Fast
500GB
Striping across
disks
Unequal hard drives
Equal hard drives