|i got mine to work all u do is get a old computer...(my grandma's)
opne it up
add the hdd to the expansion slot...
it will come up hew hardware detected
then go to disk managment (Right-Click My Computer->Manage)
format the drive to fat32 or fat
now go to winhiip
try and add any ps2 iso game
you will get an error(this is good)
now in the bottom you will see 1 icon and it says "FORMAT DRIVE"
click that...wait 5 min
after thats done shit off ur comp. umplug everything
take the hdd out
place it in your ps2
connect the networkj thing or w.e to it and boot it up with hd advance 2.0
VOILA! you just made yopur ps2 hdd compatible with ps2 and now you can even go to the ps2 browser and it will shiow up there!
EDIT:you canb backup your ps2 save games somehow too so the hdd is not just for games :)