Final answer:
The SysInfo file contains the model number, serial number, and the serial number that an iPod presents to the computer, known as the FireWireGUID.
Step-by-step explanation:
The file that contains information like the iPod's model number (ModelNumStr), serial number of the iPod (pszSerialNumber), and the serial number that the iPod presents to the computer (FireWireGUID) is the SysInfo file.
When an iPod is connected to a computer, the SysInfo file is typically accessed to retrieve these details which are important for software interactions, device support, and troubleshooting. It's not the DeviceInfo file or the IPSW file, which is associated with Apple device firmware rather than specific device identifiers.