ISO larger than 700 mb

[I_AM_DA_KID]

i need help,

i just bought sims vacation and i used clonyxxl and it said that the cd is 654 mb BUT when i make a image file with clone cd, the image size is 752 mb. WHY is this? when i use clonyxxl to read the simsvacation ISO it STILL says its 654 mb. in clony it says simvacation has safedisc v2 security and has the 'overburn' and 'bad sectors' boxes checked. if anybody can help me to make this iso the RIGHT size please respond. i want to back it up just in case. thanx