Dell Precision T7400 (Late 2007) - Manual (Page 41)

Advanced Features 41
NOTICE: Because RAID level 0 provides no data redundancy, if one drive fails, then
the data on the other drive is also inaccessible. Therefore, ensure that you perform
regular backups when you use a RAID level 0 configuration.
RAID Level 1
RAID level 1 uses a data-redundancy storage technique known as "mirroring."
When data is written to the primary drive, the data is then duplicated—or
mirrored—on the other drive. A RAID level 1 configuration sacrifices high-
data access rates for its data redundancy advantages.
If a drive failure occurs, subsequent read and write operations are directed to
the surviving drive. A replacement drive can then be rebuilt using the data
from the surviving drive. Also, because data is duplicated on both drives, two
120-GB RAID level 1 drives collectively have a maximum of 120-GB on which
to store data.
RAID Level 5
NOTE: RAID levels 5 and 10 are only available via an optional PCI Express RAID
controller card.
hard drive 1
segment 1
segment 2
segment 3
hard drive 2
segment 4
segment 5
segment 6
segment 1 duplicated
segment 2 duplicated
segment 3 duplicated
segment 4 duplicated
segment 5 duplicated
segment 6 duplicated
SATA RAID
configured for
RAID level 1