Dell XPS 720 H2C (Mid 2007) - Manual (Page 30)

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Setting Up and Using Your Computer
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 Configuration
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.
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.
NOTE:
In a RAID level 1 configuration, the size of the configuration is equal to the size of the smallest drive in the
configuration.
RAID Level 0+1 Configuration
A RAID 0+1 array combines the high data access rate of a RAID level 0 array and the data protection
(redundancy) of a RAID level 1 mirror by striping data across two drives and mirroring that striped data
on a second set of two drives.