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Difference between RAID 1 and RAID 2
  • Last Updated : 16 Apr, 2020

1. RAID 1:
RAID 1 is also called mirroring of data. Because it replicates the data from drive 1 to drive 2. One half of the drive is used to store the data and Another one is act as a mirror to the already stored data. This level provide 100% redundancy in case of failure.

Advantage –
Good fault tolerance i.e.. ability of maintaining functionality even if one disk fails.

Disadvantage –
It is Expensive Because extra drive is required for mirroring.



2. RAID 2:
RAID 2 consists of Bit-Level Striping. It records Error Correction Code (ECC) using hamming code parity. In this level each data bit in a word is recorded on separate disk and ECC codes of the data words are stored on a different set of disks.



Advantage –
In case of Error Correction it uses hamming code.

Disadvantage –
It has complex structure and high cost due to extra drive.



Difference between RAID 1 and RAID 2:

SR.NO.RAID 1RAID 2
1.RAID 1 stands for Redundant Array of Independent Disk level 1.RAID 2 stands for Redundant Array of Independent Disk level 2.
2.In RAID 1 technology, Disk Mirroring is used.In RAID 2 technology, Bit-Level Striping is used.
3.In RAID 1, one half of drive is used for storing data and another half is just a mirror for already store dataIn RAID 2, each data bit in a word recorded on a separate disk and ECC codes are stored on different disk
4.Good Fault tolerance as compared to RAID 2.Fault tolerance is not so good.
5.Hamming Codes are not used.Hamming Codes are used for Error Correction.
6.Extra Drive is required for mirroring.Extra Drive is required for Error Correction.

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