Corruption, harddisk now RAW, partition not detected by testdisk

thanks again! I did not dare to do this next step yet - trying to assess if there is something wrong with my current methods. 

Do you think I should

(A) try to input some partition information on my own, like start from sector 0 0 0 and put in the last sector found, and hope for the best

(B) or try some other geometry information

Do you also know these My Books - do they come formatted in FAT32 or NTFS? this is 1 terabyte WD Caviar Black unit.

thanks!