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This question is not so easy to answer since there is no clear link between how many error correction code (ECC) disks are needed. And, since RAID-2 is not really used anymore – today's hard disks provide the same ECC features as RAID2 does as a hardware feature -- I can only answer this from RAID-2 literature.
The minimum, according to the sources I have, is five data disks and one ECC disk which would make up to six disks.
Anyway, let me repeat that RAID-2 is not really used today and has been used very rarely in the past because of the rise of hardware integrated ECC in modern disk drives.
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