HGST Deskstar NAS 4T only shows 1.6T

I recently clean installed Windows 10 and now my 4T Deskstar NAS drive only shows as 1.64 T. It is showing as a GPT format in disk managment, diskpart and EaseUS Partition Master. I moved off my data and reformatted but still only get 1.64T.

Any suggestions on how to recover the missing storage? Thanks.

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Did you ever get an answer on this? I’m getting the same sort of thing on my mac.

I have an older motherboard, 2010 vintage. I eventually figured out that Win 10 installed an incompatible storage driver. I found an older driver that was a better match for the motherboard and was able to access the full 4T on the drive. Good luck.