swap trick?

[calibr8]

hey. we just got a brand new PS2 this week (i don't know what version that makes it) and are interesting in playing backed up games ... i read about this swap trick to play them without a mod chip ...

does this work effectively for most people?

is it likely to ruin our machine? it sounds pretty destructive ...

also, if you try removing the silver disc and using it, and the whole thing doesn't work, is it impossible to restore the PS2 to how it was before?

if anyone has some suggestions/comments on this whole thing, that would be much appreciated!!