From the perspective of capacity, flash memory has a smaller capacity than hard disk types, but the flash memory has a faster reading speed than hard disk memory. Flash memory also has much stronger resistance to damage from vibrations. If you are only listening to songs, it is recommended to buy a flash memory type, which does not require too much capacity. But if you want to record and watch a movie, it is recommended to use a hard disk, to assure you have enough memory to save the entire movie.