Unfortunately I haven't found any clear information about adding more harddisk space to an iPod. I wanna extend an iPod with a 2.5" 500GB disk, which does not necessary has to fit within the iPod case (as it is meant for building into a car). Though I am already using my 3rd iPhone, I am not familiair to the iPod family at all. Can someone help me out with the following questions: - What kind of iPod should I puchase exactly for this purpose (should be easiest possible with that one, no matter whether 2nd hand or so) ? - Where can I find the required adapater for connecting the larger harddisk ? - What else should I take in consideration or in mind ? Thanks in advance for your feedback.