PSP 4GB Hard Drive with Battery 4GB HD gives the user double the storage and the X2 battery doubles the playing time Uses ultra-reliable Micro-Drive technology which interfaces with the PSP through a flexible memory stick adapter Store up to 8 full length movies, thousands of digital photos, MP3's and PSP game savesHD fits tightly into 2 holes by the memory slot compartment X2 battery ergonomically replaces the existing PSP battery Includes Max Media Manager PC Software