Right guys, I'm stuck, Here is the situation. My iphone has been historically synced with computer 1. computer 1 died on me a few weeks ago, however I had a backup of all my music files (not in itunes format - I dont have a back up of my old media library). I bought computer 2, which I have authorised and I have created a new library which almost looks identical to my old library, albeit some different songs on there etc. My phone has used 4.3gb of storage on music and has about 0.7gb free. My new library on computer 2 has about 4.2gb of music. My understanding was that when I hit sync, it will replace all the 4.3gb worth of music which was synced on my old computer (computer 1) with the current library on my new computer (computer 2) however this doesn't happen. I get an error message saying it cannot be synced as there is not enough free space to hold all the items in the itunes library. I need an additional 3.48GB This suggests to me it's trying to add the current library onto the exisiting library which means i'll have doubles of everything. Please help, I don't know what to do? someone suggested restore to factory settings > restore from back up > sync new library?