I'm sure you just misread my post, but just to clarify, RAID5 has nothing to do with RAID1+0/RAID10. They are wildly different RAID algorithms. Again, RAID3 is likely to be the optimal solution for MP3 storage, as it's engineered for long reads of consecutive data. RAID5 is unlikely to be the best solution for anything, except a small bank account.
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Bitt Faulk