QNAP Security VioStor CMS (Version: 1.0.1) - Manual (Page 172)

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Disk Configuration
Single Disk Volume
Each hard drive is used as a standalone disk. If
a hard drive is damaged, all the data will be
lost.
RAID 0 Striping Disk Volume
RAID 0 (striping disk) combines 2 or more hard
drives into one larger volume. The data is
written to the hard drive without any parity
information and no redundancy is offered.
The total storage capacity of a RAID 0 disk
volume is equal to the sum of the capacity of all
member hard drives.
RAID 1 Mirroring Disk Volume
RAID 1 duplicates the data between two hard
drives to provide disk mirroring. To create a
RAID 1 array, a minimum of 2 hard drives are
required.
The storage capacity of a RAID 1 disk volume is
equal to the size of the smallest hard drive.