boot disk

[iron brew]

Hello last week when having a look at this site ive seen some posts that say you cant copy the boot on a cd (this is correct because if you could you would not need mod chips) ive also seen on this site that for a boot disc to work you need a modchip anyway(whats the point having one then) but today i downloaded file of kazaa that you burn to disk then use on a psx 2 as a boot disc it also says no need for a modchip
Ihave not yet tried it because i dont have a psx 2 just downloaded it for my sister who has one ..
anybody got an opinion on this or has anyone tried this ..