If I'm not mistaken it should have given you an error # followed by a description.
Holding the power for 5 will return to the gameos.
(I'll look through the source and see if I can figure things out from here...you're best be is just reinstalling the otheros...unless someone here has some objection to that (thinks its a possible mod (which I don't)))
It might not have formated it properly and is accessing the ps3 hard too.
ls -a /dev/sda:
with colon that might give you an answer...that should be the ram disk