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I have a 3TB WD Passport Drive. Yesterday I plugged it in and Disk Management showed it as unallocated. So I ran testdisk to rebuild the BS. It did.
But the weird thing was that the drive still showed as unallocated. Then I ran chkdsk /f on it. All of my files and folders appear, but probably 50% of them show as 0KB.
But now, Disk Management shows one partition of 2048GB and another at 1677.99GB that is unallocated. My drive initially had about 800GB left of free space.
Is there anything I can do to get these files back? Thanks a lot

For partition bigger than 2 TB, your disk need an EFI GPT partition table (or 4096-bytes sector).
Honestly I don't know how to help you as it can be a problem of wrong disk capacity, wrong partition table, corrupted filesystem...
It's always possible to use PhotoRec to recover your data, at least it's safe as long as your wrote the recovered files on another disk.