Not able to restore ISO in OPL PC Tools

[chaogamer]

The game im trying to restore into one ISO File was Guitar Hero II, which is 4.6 GB, which i had to split into separate iso files, but when i try to combine all the files into one iso, around 91%, it gives me this error and cancels out

i dumped the game using OPL PC Tools itself, no control for speed write, so i don't know if it was a bad dump.
does anyone know what this means?

[brainstream]

I assume you are trying to restore an ISO image to a FAT32 file system that supports files up to 4 GB in size. When OPL PC Tools tries to write data exceeding this limit to a file, you will receive an error.