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    RAID LEVEL 2: Hamming Code ECC
    0 1 2 3 4 5 6 10 50 0+1
    RAID LEVEL 2: Hamming Code ECC
    0 1 2 3 4 5 6 10 50 0+1

    Each bit of data word is written to a data disk drive (4 in this example: 0 to 3). Each data word has its Hamming Code ECC word recorded on the ECC disks. On Read, the ECC code verifies correct data or corrects single disk errors.

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    Characteristics & Advantages

    • "On the fly" data error correction
    • Extremely high data transfer rates possible
    • The higher the data transfer rate required, the better the ratio of data disks to ECC disks
    • Relatively simple controller design compared to RAID levels 3,4 & 5

    Disadvantages

    • Very high ratio of ECC disks to data disks with smaller word sizes - inefficient
    • Entry level cost vey high - requires very high transfer rate requirement to justify
    • Transaction rate is equal to that of a single disk at best (with spindle synchronization)
    • No commercial implementations exist / not commercially viable
     
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