PS2 Game Backups.....The perfect backup?

[oZER0o]

I've noticed that some of my backups behave slightly different to my originals. for instance, Metal Gear Solid 2 Sons Of Liberty, I dumped an ISO image with DVD Decrypter, then burned it with DVD Decrypter at 1x speed. but in the codec, the words take longer to load up, and pretty much everything takes longer to load, not that much though. did i rip the image too fast, or is this a universal trait of backups?

my backup of MGS3 snake eater seems flawless, everything loads up fast, just as fast as the original. and then on the other side of the coin, my backup of Second Sight, has load times that you could die of old age through.

I do realise that if i loaded them onto a HDD, i probably wouldnt have any of these problems. my trouble with that is, i have alot of stuff on my HDD, and i need somewhere to store it temporarily, because the PS2 has to reformat the drive, or so I'm told.

I know it could be my media, but I'm using Ridata DVD-R's with Ritek G05 dye.

oh, 1 more question. if i dump an image from a backup that has slightly slow loading ties, but still works, if i burn that onto better media or put it on the HDD, will it behave like the original, or will it be slightly changed? i would have thought its all the same data, so no, but I can't be sure.