RAID 1
Provides redundancy by writing all data to two or more drives.The performance of a level 1 array tends to be faster on reads andslower on writes compared to a single drive, but if either drive fails,no data is lost. This is a good entry-level redundant system, since onlytwo drives are required; however, since one drive is used to store aduplicate of the data, the cost per megabyte is high. This level iscommonly referred to as mirroring.


Advantages
No parity generation
Easy to implement
Extremely fault tolerant
Utilises full disk capacity
2 drives minimum
Disadvantages
Inefficient use of disk space
High disk overhead
Doubles number of writes

Applications
Pre-Press
Video editing and production
Image manipulation/editing