No, I'm sorry, I meant the DVD drive. If you've got one of the Toshibas they tend to go bad. The Phillips will last forever, though.
If you wanted a new hard drive then you've got a lot more work to do. You'll have to flash the bios, unlock the old HDD, and lock the new HDD with the eeprom code from the old one. If you want more info on that let me know, but for the not reading games problem it's just as simple as switching the DVD drives.
PS the Torx sizes are 10 and 20, not 10 and 15. Sorry.