http://hdloader.com
You buy and install a normal Hard Drive into your PS2 (which it formats in its own way - so it can't be used in place of the official Sony PS2 HD )
Then you get the Disc from the link above and load your games on to the HD - you can then run your games of the HD without changing discs.
Alas - it will Fail DNAS tests - so you cannot use the on-line part of games when they are loaded via the HD.
Just loaded Rez , WipeOut Fusion and Vice City on to mine
[edit] - oh yes, and it reduces load-times.
You buy and install a normal Hard Drive into your PS2 (which it formats in its own way - so it can't be used in place of the official Sony PS2 HD )
Then you get the Disc from the link above and load your games on to the HD - you can then run your games of the HD without changing discs.
Alas - it will Fail DNAS tests - so you cannot use the on-line part of games when they are loaded via the HD.
Just loaded Rez , WipeOut Fusion and Vice City on to mine

[edit] - oh yes, and it reduces load-times.
and one is FFXI and that never goes off.