I've put about 2gb's worth of music on my ipod and so that means i should be left with 16.5gb worth of storage seeing as the ipod has 18.5gb

the thing is, when i go into settings>about
capacity shows 18.5 as does the available space

my flatmate who has an ipod mini doesnt have this problem. is there a way to correct this, i know its not a major issue but would be handy if it actually worked properly