possible dumb question, ive only got hte 8 gig 4s, it said it needed 3 gigs to dl the software for i0s7, i deleted 3.2 gigs , all mymusic cause i can just resync no big, but it that 3 gigs used for the new software gonna replace the gigs used for i0s 6? or am i now just gonna have almost no room for music?