The iPod's firmware contains a diagnostic menu. On a 3G or earlier iPod, reset it then hold Previous, Next, and Select; on a click-wheel iPod, hold Previous and Select. Release the buttons after a few seconds, and the unit will chirp and briefly show a backwards Apple logo before displaying the diagnostic menu. Navigate through the menu with the Previous and Next buttons (not the scroll wheel), and select items with the Select button. Press Play/Pause to exit a test. Apple has never publically documented the functionality of the diagnostic menu.

The PSP's battery is removable for replacement by the end-user. This may be a response to the criticism of the nonremovable batteries in other portable electronics such as the Apple iPod. One is thus able to purchase extra batteries as an accessory; at the Japanese launch, they cost �5,040 including tax (around US$47, �37, �26).


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