The iPod Touch uses memory to store programs and other information, but it does so in a totally different manner than all of the other iPods. Using the iPod Touch as a storage device cannot be done by enabling the portable hard disk mode in the way other iPods do. Instead, specialized programs, or “apps,” must be used to enable the iPod Touch to be used as a portable hard disk. The apps vary in price and complexity but all work in a similar fashion, enabling the iPod Touch to be used as a portable hard disk. Tips Warnings Writer Bio

How to Enable Portable Hard Disk Mode on an iPod Touch - 76