The biggest selling point of the Tungsten T5 is its 256MB of memory--almost four times as much space as its predecessor (the Tungsten T3). Sure, you can always add storage using the T5's SD slot, but you might need that for something else, such as an optional SD Wi-Fi card. Interestingly, a large part of the T5's memory is non-volatile: even if it loses its charge, you won't lose any of your data. And 160MB of it is held in an internal flash drive. Read more