Um if you haven't caught on, the US HDD is the same as the japanese one even in the software evolution. IE whent he HDD started off in japan it only had the browser and save features. Shortly there after navigator BB .10 was released and the evolution continued to BB navi .31.
JAP 60GB PS3 (release date)
37000 L V7 Ocean Blue Matrix Infinity BB Navi (.32)
30001-R V4R Magic ICE 91f3+ PS2 Linux (2.4.1)
10000 V0 No Mod, PSP-1000 1.0 FW 100K release model
PS2 Linux Kit (BB Navigator Installed)
Scph-5501 Stealth, All Sega Systems
Cube with Save, Xbox 1.0 Modded