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I had similar issues recently, the drive size mismatch is because of a driver. Update (or in my case I had to actually roll back a driver). In Device manager, I believe under IDE ATA / ATAPI controllers, I updated the Standard AHCI Serial ATA controller, maybe the dual channel PCI IDE one, It may be ...

Similar problems recently I think CHKDSK ran normally for me but currupted my drive, because the drivers were using recognize the drive in some programs as only 800GB vs 3TB.

Update your drivers (or I think i actually had to roll back to an older driver).
It says in TestDisk, not to restore if ...