Skywin FMCB Free McBoot Card v1.966 for PS2 - Plug and Play PS2 Memory Card - 64 MB Memory Card PS2 Runs Games in USB Disk or Hard Disk
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Questions & Answers
Tap X on the main screen once you have scrolled all the way down to code breaker. On there are tons of cheats that you can apply to a lot of games.
The main issue with the PS2 is that it can only handle USB 1. To add to the previous response, The fastest reading speed is 0 which is notoriously slow and slow even compared with reading a physical disk. For those of you using Slim PS2s, you can do like the other customer said, or you can set up SMB servers on your home network and play games that way using the OPL homebrew software, which is a very technical process, so you're on your own.
In my case, I had v9 codebreaker with code for nearly all the games.