USB Hard Drive
The PSP can be connected to an external hard drive, which allows the use of a graphical user interface to browse the external drive and transfer files to the PSP. This method requires a mini-USB-to-USB wire, as the PSP has a mini-USB connector.
PSP Hard Drive
You can purchase hard drives that are specially designed for use with the PSP. These devices attach to the game console via the battery slot and memory card slot. Adding such a drive doubles the thickness of the PSP, which can make it difficult for some users to hold.
Standalone USB Hard Drive
This drive is similar to the USB hard drive mentioned in Section 1, but it features external buttons that make it possible to manage files without the use of a graphical user interface.