How many different levels of RAID are there?

RAID is Redundant Array of Independent Disks. It is combination of hard disk drives which are linked together for higher performance.
The levels of Raid are:

1. Raid 0: This level helps for striping the data across multiple disks without any unneeded information; this also helps for high performance and also for high storage.
2. Raid 1: This level helps for maintain copy of data Separate disks drives. This level provides highest data availability as two sets of data is maintained.
3. Raid 3: This level striping of data is made only to a set of disks; this level can withstand a single disk failure without losing data or access to data. This level provides good data availability. Equivalence is generated and stored on dedicated disks.
4. Raid 5: In this level both equivalence and data striping is made this reduces chance of data loss. This level offers excellent utilization of disk space. This disk has poor write performance as each write requires four independent disk accesses to be completed.

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