The SanDisk G-RAID Mirror external Thunderbolt-powered RAID hard disk is currently the cheapest for both the 48 TB and 16 TB variants.
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Amazon is now offering discounts on 8TB, 6TB, 4TB and 3TB Seagate IronWolf NAS internal hard drives. You can get them with discounts of up to 19% and upgrade your NAS devices at good prices.
The Seagate IronWolf 12TB NAS hard drive has a ton of storage for your streaming media and PC backup needs, and it's just $198.99 right now on Amazon so you could get more than one for your NAS case.
With Christmas nearing, multiple SKUs from QNAP's TS series are now selling at close to half the MSRP launch prices. There are 2-bay, 4-bay, 6-bay options with varying memory capacities.