Well I'm assuming you don't know what a Dex Drive then is either.
A SharkPort is for the PS2. It has 2 USB cables one that connects into your PS2 and the other that connects into your PC or MAC. You must have a TV and PS2 near the computer to have this work properly or you can buy a longer USB cord (which I will be needing).
A SharkPort let's you take your saves from your memory card and puts them on the harddrive of your computer. So now your computer acts as a huge memory card.
You can also download saves off the internet and upload them onto your memory card using the SharkPort. You can get codes as well, but I think you need a GameShark for this.
SharkPort costs about $30 at EB if you have a few PlayStation games laying aroud that you don't play anymore you can take them into EB and get the SharkPort for about $9 like I did.