RAID is divided into 7 levels (level), ranging from RAID 0 RAID 6 s. d. Each level is not a hierarchical relationship but the difference of architectural design. Levels-levels (level) in the RAID is divided into 3 characteristics are as follows :

- RAID as a collection of some of the hard disk (physical disk drives) that are only visible by the operating system as a logical drive.

- The Data is distributed to all multiple hard disks within the array of tsb.

- Redundant disks are used to store parity bits of information, its function is to restore your data if one of the hard disk damaged data.

The last two characteristics above, not supported by models of RAID 0. The following is an explanation of each RAID level.

a. RAID 0 (Disk Striping)

Disk Striping allows us to write data to a hard disk instead of write data to a hard disk only. With Disk Striping, each physical Disk will be divided into several elements stripe (ranging between 8 KB, 16 KB, 32 KB, 64 KB, 128 KB, 256 KB, 512 KB, to 1024KB). Every part of the stripe on each hard disk is called a strip.

Disk Striping enhances performance because data access is accessed by more than one harddisk, so that more disk spindle that worked in the service of i/o data. However, Disk Striping (RAID 0) has no data redundancy/data protection against a hard disk crash, because all data is written directly to all of the hard drive. Of the capacity, then the RAID 0 we can use 100% of the total amount of the capacity of the hard drive installed. Example: 4 300 GB RAID 0 hard drive unit will generate a total capacity of 1.2 TB usable.