USB MODE
USB Mode must be selected for the PSP to connect to a computer when the cords are plugged in. The screen of the PSP shows USB Mode. This verifies that it is connected to a computer. Pulling the cords out while the Playstation Portable is transferring data in USB Mode is dangerous and could corrupt the files being transferred.
Transfer Data From Computer
Since the Playstation Portable can play movies, music and games, transferring them from a computer is as simple as copying everything into the designated folder of the memory stick.
Connect to a PS3
The Playstation Portable can be connected to a Playstation 3. After USB connection, music, videos and some games can be moved to the PSP and vice versa. Remote Play also requires a USB connection between a PSP and PS3 to register the PSP.
USB 2.0
The Playstation Portable uses a USB 2.0 cable. This allows for a much faster transfer rate than USB 1.0. The PSP does not have a regular USB port but a mini USB port and therefore needs a mini USB to USB cable.
Charging
Firmware 3.6 for the PSP 2000 (and up) allows the PSP to charge while it is in USB Mode. This means that regular PSP USB cables that also connected to the charging port were not needed to charge it.