computer I/O error

I have an ISO that I am transferring from my PC to my psp, but it moves over kinda slow, and several times it says that there is an I/O error. I also have a laptop, but it doesnt happen on it and it transfers over easily without any problems. the reason im not using it is because the battery went bad and i have to get a new one. so can someone please help with the I/O error?thanks in advance

it usually means theres a hardware problem with your disk or a controller in the PC. try running chkdisk