The DMS crap will never allow you to use an off the shelf HDD rather then a sony branded one. The sony branded one has special firmware. What DMS is talking about is the ability to launch emus and other crap from the HDD. Also PS2 games WILL NOT boot from the HDD like xbox.
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