Dell Precision T3400 (Late 2007) - Manual (Page 44)

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About RAID Configurations
RAID Level 0
NOTICE:
Because a RAID level 0 configuration provides no data redundancy, a
failure of one drive results in the loss of all data. To protect your data when using a
RAID level 0 configuration, perform regular backups.
RAID level 0 uses a storage technique known as data striping to provide a
high data access rate. Data striping is a method of writing consecutive
segments, or stripes, of data sequentially across the physical drive(s) to create
a large virtual drive. Data striping allows one of the drives to read data while
the other drive is searching for and reading the next block.
Another advantage of a RAID level 0 configuration is that it utilizes the full
storage capacities of the drives. For example, two 120-GB hard drives
combine to provide 240 GB of hard drive space on which to store data.
NOTE:
In a RAID level 0 configuration, the size of the configuration is equal to the
size of the smallest drive multiplied by the number of drives in the configuration.
RAID Level 1
RAID level 1 uses a data-redundancy storage technique known as mirroring to
enhance data integrity. When data is written to the primary drive, the data is
also duplicated, or mirrored, on the second drive in the configuration. A
RAID level 1 configuration sacrifices high data-access rates for its data
redundancy advantages.
hard drive 1
segment 1
segment 3
segment 5
hard drive 2
segment 2
segment 4
segment 6
serial ATA RAID
configured for
RAID level 0