That would be a BAD idea. With only 1 usb (2.0) port on the OUYA, you'd be choking any benefit of running raid (stripping) for a performance increase. SATA 3 = 6gbit's per second, USB 2 480mbps, which translates to 768 Megabytes per second (SATA3) vs 60 Megabytes per second (USB2)
You'd be better off getting a NAS (use raid 10 which will require 4 drives...make sure the NAS supports RAID10 too, in case of drive failure) and using XBMC. However, you'll want the OUYA to hooked up with Ethernet, and not wifi as i've seen a lot of throughput problems on the ouya's wifi.
I know this is a little dated, but RAID is a perfect solution, I personally would go with RAID 5, this way you don't end up with as much wasted space as a RAID 10 and still have protection against data loss. RAID 5 with a spare is even better.
If you're running Linux and feeling froggy try to layer LVM over top of a RAID 5 for a safe and expandable way to store data.
On windows you can use an app like drive bender to pool drives and keep backups.
As far as USB, that solution is fine if you are feeding a few computers but anything more will be too much of a drain on the throughput and need eSATA or better. I personally do this with 4 4TB drives in an external USB enclosure, it works perfectly.
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