I have a decade old, 2nd Gen iPod (a huge white and silver brick) that arguably beats my iPod Touch in two key built-in features. The first is that it is much faster to transfer music to because it supports FireWire, (but that’s a rant for another time). The brick’s second excellent feature is the ability to mount on my Mac and act just like an external hard drive.
While it doesn’t seem like iPhones/iPods will be supporting FireWire any time soon, a slew of third party app developers have addressed the need to use your Apple mobile device as a wireless portable drive. Nearly all of them function in the same manner so I’ll walk you through the app that I personally use and then present a number of alternatives.