DAS for my Dell Poweredge

I have a Dell PowerEdge 2970 running Server 2008 R2 RAID1 for O.S. and a RAID10 for data
This is a file server and I'm in need of more space, can one recommend a DAS and controller card to add to this server?
Looking for 20TB of space SATA is ok, my tag number on this server is DJ8KNK1

jsarinanaI.T. ManagerAsked:
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andyalderSaggar maker's framemakerCommented:
http://www.dell.com/us/business/p/powervault-md1200/pd - 12 bays, 4TB disks = 48TB native although you're best off using RAID 6 so 40TB. H800 is listed on that page as the required controller, not sure whether cables are included.

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