you need a drive that will fit the ps2 network adapter. (Western Digital Drives do not fit, the 4 pin power molex connector is spaced out to far) but most Maxtor drives fit that I know) I have HDAdvance (
www.hdadvance.com) and it supports up to 200GB drive. Most games can be copied and run off the HD, the loading times are much faster (GTA:SA). Cannot copy Dual layer DVD-9's (like GT4) onto the HD.