Adding more drives

WD Legacy Products Sentinel Products
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I actually meant a RAID 5 setup with 3 two terabyte disks, not a JBOD config (just using the same capacity terminology as the sentinels are billed as- for example, the 8TB model is configured as a RAID 5 and obviously doesn’t have 8TB of free space). So I would have a bit less than 4TB usable space and have a spare. A hot spare option would be nice too.