RAID 2 n Multiple parity disks store Hamming

RAID 2 n Multiple parity disks store Hamming code error correction in corresponding positions

RAID 4 n n n Large stripes Bit by bit parity calculated across stripes

RAID 5 n n n Like RAID 4 Parity striped across all disks Round

RAID 6 n n Two parity calculations Stored in separate blocks on different disks

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RAID 2 n Multiple parity disks store Hamming code error correction in corresponding positions RAID 2的錯誤校正碼(漢明碼)是由每個磁碟的對應位元，計算所得出的結果，並儲存於多重同位元磁碟的對應位置。缺點 : 成本很高。 5

RAID 4 n n n Large stripes Bit by bit parity calculated across stripes on each disk Parity stored on parity disk 逐一位元的同位元條帶，是計算每個對應的資料條帶，而得到的同位元，並且存放於同位元磁碟對應的條帶中。 7

RAID 5 n n n Like RAID 4 Parity striped across all disks Round robin allocation for parity stripe Avoids RAID 4 bottleneck at parity disk Commonly used in network servers 8

RAID 6 n n Two parity calculations Stored in separate blocks on different disks User requirement of N disks needs N+2 High data availability n n Three disks need to fail for data loss Significant write penalty MTTR(mean time to repair ; 平均修復時間) 9