Toshiba Magnia 3310 - Manual (Page 17)

Setup
Setup Wizard
13
Data is recorded in a dispersed manner and the write and read
performance of the HDDs is high.
RAID1 (Two HDDs are required)
The HDDs are mirrored images of each other. The same data is
always written to both HDDs. Therefore, if one HDD is damaged,
the operation can be continued by the other HDD.
RAID5 (Three or more HDDs are required)
Multiple HDDs are grouped and constructed as a single logical
device. Data and parity are recorded in the grouped HDDs in a
dispersed manner. If one HDD is damaged, the operation can be
continued by the other HDDs.
Hot Spare (Can be used if RAID1 or RAID5 is selected)
Hot Spare is a spare HDD in stand-by; when one HDD is
damaged, the hot spare automatically goes on-line.
HDD Assignment
Select the number of HDDs for the RAID configuration from the
list. When "MAX" has been selected, the RAID array is structured
with the maximum number of HDDs (= 6).