This **raid calculator** determines the array characteristics based on disk capacity, number of disks and array type. Below the form you can find more information on this subject.

## How does this raid calculator work?

This is an online tech tool that estimates the array characteristics based on disk capacity, number of disks and array type. RAID is the acronym for Redundant Array of Independent Disks which refers to combining several hard drives into a single storage unit with the scope of the performances in writing or reading the disks to improve or stay at the acceptable level or in order to ensure data backup in case of an error disk.

In order for the *RAID calculator* to work, you just have to choose the array type, input the number of disks and the disks capacities.

The supported RAID levels are RAID 0, RAID 1, RAID 2, RAID 3, RAID 4, RAID 5 and RAID 6.

## Example calculations:

RAID 0 5 disks 2GB/drive |
RAID 0 is described by block-level striping without parity or mirroring;Total theoretical initial capacity: 10 GB; RAID 0 space efficiency is 100%, which means the space efficiency for 5 disks each having a space of 5 GB is: 10 GB; There is no fault tolerance in case of RAID 0; Assuming each drive has a failure rate of 5% the array failure rate is: 22.62%. |

RAID 1 4 disks 20 GB/drive |
RAID 1 is described by mirroring without parity or striping; Total theoretical initial capacity: 80 GB; RAID 1 space efficiency in your case is 25.00%, which in case of 4 disks each having a space of 20 GB is: 20 GB; In your case the fault tolerance ensured by RAID 1 the space efficiency is 3 drives; Assuming each drive has a failure rate of 5% the array failure rate is: 0.00%. |

RAID 2 5 disks 4 GB/drive |
RAID 2 is described by bit-level striping with dedicated Hamming-code parity; Total theoretical initial capacity: 20 GB; RAID 2 space efficiency in your case is 60.00%, which in case of 5 disks each having a space of 4 GB the space efficiency is: 12.00 GB; The array failure rate in case of RAID 2 varies. |

RAID3 3 disks 15 GB/drive |
RAID 3 is described by byte-level striping with dedicated parity; Total theoretical initial capacity: 45 GB;RAID 3 space efficiency in your case is 66.67%, which in case of 3 disks each having a space of 15 GB the space efficiency is: 30 GB; The fault tolerance ensured by RAID 3 is 1 drive; Assuming each drive has a failure rate of 5% the array failure rate is: 0.73%. |

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