[spooky]

As Warlock mentioned the most common problem relating to read errors are dirty or damaged original disks!

You wont be able to get a full working backup of a disk that has errors during the read session even if you use a proggy like Fireburner that will carry on reading the disk instead of halting. Fireburner inserts Zeros for data that cannot be read, and no PSX game contains zeros.

You mentioned Final Doom, well this has no protection on it and you may be able to save your damaged original by using a special cd polish that can reduce the problems encountered with scratched disks. You should be able to get the polist from your local Hi/Fi agent.