If a HDD is not formatted when you first run HDL on it.... it will ask if you want to format the drive... honestly... how could they sell it if the user had to figure out how to format the drive for themselves.... think man, think LOL.... soory just had to... ya know brotherly love
with HDDs available form several places for $100us for a 300GB drive... man you can't pass that up... and make sure you shrink all the games that you can.... I've just got my 300GB drive and have saved about 10GB shrinking 7 of the games I have on my drive.... which in turn is enough for 2-5 more games... I'm shooting for 100.
I'd use WinHiip or DMS HDD Format to format the drive... unless you have a patched version of HDL... so that it can read the larger than 127GB drives... if you're under that you should be golden.
PS3 Slim 320GB
PS2 v11 exploit w/300GB Maxtor
PS2 v10 exploit w/80GB Samsung - Network Games
PS2 v10 exploit w/60GB Samsung - Network Games
PSP 1001 3.52M33 w/10GB total storage
NDS DSReal 4GB