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**FOR MAC USERS!! After 2 "failed" drives were sent back, I called customer support to find out why I wasn't able to troubleshoot via any online methods, and get this to work for my mac! Apparently the solution was insanely easy, but I never saw this eeeasy solution online in any of the forums I found. The issue with erasing/formatting for a mac just has to do with the view you have open in Disk Utility. Make sure you go to View > Show All Devices, and then "erase" the top tier drive. Problem solved.