I have a WD6400AAKS-75A7B0 drive that has had its CHS values modified in testdisk, and now I need to know the correct ones to fix it. Also the sector size. It was a drive out of a Dell Inspiron tower if that helps.
You might need to contact WD support for this one dude
CHS values have been irrelevant for quite a long time. If you can give us a history of your drive, perhaps we could help you reconstruct your partition table by hand.
To this end, could we see the partition table and boot sector with Microsoft’s Sector Inspector?
Extract the above archive to the one folder and execute the SIrun.bat file. The procedure will generate a report file named SIout.txt.