call of duty backup

[99zoomer99]

im trying to play my backup of call of duty...i get to the install where it asks for disk 2 but when i put the backup cd in it doesnt recognize it......ive tried nero and cdrwin5 but it doesnt wanna work....i thought it was because i was naming the cd wrong (couldnt fit all the characters that the install asked for "Call of Duty CD 2"). but iso doesnt allow for that many characters.....not sure what the problem is....can u help me play my backup