External Hardisk for Ps2?

Yes there is an external hard disk on a FAT ps2.. I dont know if there is any from the slim version. PS2 Rentals here in my country uses an external disk to play games... I do not know how will it work but as far as I have seen, you can put games in it and play it without a CD. There is a browser thingy when you start your PS2 with an external hard drive and lets you choose the games you imported... Really dont know how they make it work but I know it exists.

Yes it is possible, you can use IDE Hardrives but that requires soldering an IDE computer cable on your Playstation 2 Motherboard, which preety much voids your warranty. You can also use External Hardrives should be FAT and AC Powered and connect it through the USB port with a help of a Homebrew Program installed on your Memory. Not reccomended though since they say it takes a lot of time to load a game lol.

i have seen some shops in my country that is using an external harddrive to play games. but personally i dont have any idea about it.

i think its not possible, as an alternative i just simply copied the original cd to a new blank cd so i can save the original one.