I am setting up a new PC and have 3 identical disks. Does it make sense to stripe all three or is two sufficient? I don't really need extra space, so wondering if 3 will yield better performance than two.

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    Raid 0 is inherently unsafe. I'd consider using Raid 5 with all 3 disks. en.wikipedia.org/wiki/Standard_RAID_levels – Tetsujin Feb 28 '15 at 18:50
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    Just be careful with RAID5 - if two disks go then you'll lose the lot. Multiple backups is crucial in all situations. – Kinnectus Feb 28 '15 at 20:06

Every disk in RAID-0 increases read/write performance and chance of failure - even if one disk dies, whole system dies. So I'd recommend to either:

  • add another disk and set up RAID-10
  • set up RAID-0 with two disks and backup important data to third disk
  • set up RAID-5 as Tetsujin advised, however RAID-5 has lower performance

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