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RAID level 1
Drives are mirrored or duplicated. This RAID architecture automatically copies data on a second set of drives, creating an exact copy of all files. This offers complete redundancy but is an expensive solution since you need to buy twice as many drives.
RAID level 3
A high-bandwidth solution for applications that transfer large sequential files such as OPI, RIP and CTP. The data are written in bytes across multiple drives with one drive holding the parity or error-correcting code. Writing at the byte level enables calculations to be made on the fly, without having to first read data into a cache. There is no performance degradation. RAID level 3 offers full redundancy.
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