RAID 5 provides basic fault tolerance with good performance, but it cannot protect against multiple drive failures. RAID 5 with a hot spare improves fault tolerance by automatically replacing failed drives, but it still has the same limitation regarding multiple drive failures. RAID 6 offers a higher level of fault tolerance by using double parity, allowing for the simultaneous failure of up to two drives without data loss. However, it has higher write overhead and requires more drives for implementation compared to RAID 5.
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