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i think he means whether he has a 1st gen or 2nd gen mini.

if the capacity (4/6gb) is written on the back of your mini, it´s a new one.
if it´s not, it´s an old mini.
 
also, the color of the play/pause/ff/rewind symbols on the scroll wheel of the 1st gen are grey, regardless of the mini's color.

on the 2nd gen, the color of the symbols match the color of the ipod. so a pink mini would have pink labels...
 
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