here are many external hard drive enclosures on the market, but most don’t offer RAID 5/10 support like the SilverStone DS351 External RAID HDD Storage Enclosure does. Of course this unit is a lot more expensive that a regular external hard drive enclosure, but it will give you peace of mind knowing your data is safe. If you treasure your pictures, music, movies and other data, you need to ensure it’s not going to be lost due to a hard drive failure. The SilverStone DS351 External RAID HDD Storage Enclosure accepts up to 5 hard drives and supports Raid 0, Raid 1, Raid 10, and Raid 5.