WD My Cloud EX4100 16TB Expert Series 4Bay NAS. It includes 2x WD RED NAS 8TB Hard drives model # WD80EFZX. All In perfect working order, just upgrading to something bigger. The item "WD My Cloud EX4100 16TB Expert Series 4Bay Network Attached Storage" is in sale since Sunday, March 3, 2019. This item is in the category "Computers/Tablets & Networking\Drives, Storage & Blank Media\Hard Drives (HDD, SSD & NAS)\Network Attached Storage".The seller is "dakotart00" and is located in Austin, Texas. This item can be shipped to United States.