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I have a few systems with a similar hardware configuration - several internal hard drives (up to 10) each with its own drive letter, plus at least one external Drobo disk array. My conundrum has always been - include the Drobo in the pool, or leave it out? I use duplication on all my folders... Drobo's are great, they're fault tolerant using either single or dual parity; however when coupled with a DrivePool box, adding the Drobo to a pool that has all its contents duplicated would be a waste of drive space that's already protected by duplication. So it would be great to be able to qualify a disk as "fault tolerant," allowing DrivePool to write files/folders that are enabled for duplication to only the fault tolerant disk (such as a Drobo). I also have had RAID-6 arrays that I had broke up and put each drive in DP; however, it would be nice to be able to mix and match single drives along with RAID arrays without wasting disk space.