Well,
50 % rougly chance of getting a Samsung drive, and 50 % roughly of getting a Hitachi drive.
Hitachi drives produced after late July/early August are most likely version 0078FK, and I doubt there are any retailers left with consoles made in late July/early August, but someone reported byuing a console made in late September and getting a 59DJ drive, so apparantly some newly made consoles have another drive than 0078FK.
But, you could always buy a used console
