Raid Level 1 - Dell Precision Workstation 370 User's & Service Manual

Another advantage of a RAID level 0 configuration is that it utilizes the full capacities of the drives. If you have two 160-GB
drives installed, you have 320 GB on which to store data.
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, it 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 160-GB RAID
level 1 drives collectively have a maximum of 160-GB on which to store data.
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