PS2 Boot: Why the Gameshark Works
 

The gameshark doesn't have the restrictions that the Magic Swap Cds have--an inability to boot psx copies or originals. The Gameshark comes with two cds--one for each system and is a bonifide boot cd for the ps2. I just found out that a company sells the flip lids with the Magic Swap Cds. If you know someone who can cut you a nice square and can creatively make you a hinge and handle for your cut lid, you will save some money. I don't want praise; I just want you guys to enjoy backing up and playing your originals. It works!!!!!

You still need a large toc game for dvd, then you need to perform the swap with the dvdr.
By the time you have paid for everything (Gameshark, fliptoplid, hammer for case :p ) it would cost MORE than getting a mod installed which does it already.

The swaps have been known for years now. Nothing new exept instead of sticking a knife in the drive you are putting a chainsaw to the case.

And as for ps1 originals then you don't use the swap magic disc to boot them :S