Portable flash media for content distribution is the distribution of media on removable flash memory devices, such as flash cards and USB drives. The media can be promotional or full-length and often refer to music, movies, TV episodes, video game software, maps, electronic books (e-books) and other consumer content. The memory employed is based on reprogrammable NAND flash memory—not to be confused with one-time programmable memory, such as mask ROM or 3D memory, which is often used in storing gaming software content.