I'm going to start by saying I know these are refurbished/renewed/recertified drives. I'm not here to debate if buying refurb drives are a good purchase or not.
If you are looking into buying MDD drives from GoHardDrive, the listing on their site shows an example of the hard drive. The 12TB Enterprise shows what appears to be a relabeled Segate Exos drive. I've ordered 6 of these 12TB drives. Despite having the same model number, 5 of them are relabeled Seagate Barracuda Pros and 1 of them is a Seagate Exos X16. The Exos reports .01TB less then the Barracuda Pros. This can be problematic if you are setting up or replacing a disk in a ZFS pool
While I'll personally continue to buy from GoHardDrive, I find it a bit of a problem when they give the same model number to two very different drives.
X16 on the left, Barracuda on the right
X16 on the left, Barracuda on the right