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Read the AR Max Evo manual, it has details of the format option (which I believe is pressing square when highlighting a device)
Yep, when you load the disk.....at the bottom of the screen look at the scrolling text it tells you to press square or whatever it says.
unmodded v10 PS2 NTSC
120 GB Maxtor Hardrive
HDL exploit (Key Launcher)
PS1 game: Twisted Metal 3
PS2 remote ( w/ reset button )