eSATA External Storage
11
Data
RAID0+1
The system saves data on four hard disk drives by using both RAID0 and RAID1 level. It saves data across
the two hard disk drives and the same data on the other two hard disk drives simultaneously. It prevents data
from being lost even when one or two on which different data is saved of the hard disk drives fails. It enhances
the hard disk drive speed and the data stability at the same time while decreasing the capacity to the half.
NOTE:
Even if one or two on which different data is saved of the hard disk drives fails, it is possible to save
data. However, it is recommended that you replace the failed hard disk drive and proceed RAID rebuilding.
Data
The following table displays the data loss when two of the hard disk drives fail.
(O: Rebuilding available, X: Data loosed)
Failed HDD
HDD1
HDD2
HDD3
HDD4
HDD1
– O X O
HDD2
O – O X
HDD3
X O – O
HDD4
O X O –
