How to sync music to iPhone 4 with two different computers

Discussion in 'iPhone' started by foofighter1807, Jul 6, 2010.

  1. foofighter1807 macrumors newbie

    Jun 28, 2010
    I'm trying to add music to my iP4 using my computer (main) and my GF's. So I started to use my GF's computer and added the music I first itunes warned me that I needed to erase and sync using one library. I clicked ok, because there was nothing on my phone at the time. So I added all the music, now, I want to add music using MY computer but that same dialog box pops up warning me that it will delete my music I just recently added.

    I googled this and it seems like many people changed their library file settings, etc...but I dont want to do this. It was so simple on my touch just to click "manually manage music" but now its all complicated!

    Anyone have any suggestions or solutions to get over this? Thanks!
  2. lumpy macrumors newbie

    Mar 19, 2010
    you answered your own question. You've got to make the "library persistent ID" match on all of the iTunes libraries that you'd like to 'sync' your phone to. This only allows you to put music *on* to the phone however, not take it off into the library. You can put Apps into the library though if they have the same Apple ID....
  3. rotlex macrumors 6502a

    May 1, 2003
    Have a question similar to this that I have yet to find an answer for, I think at least. :)

    Getting my wife an iPhone, or giving her my old one now. We each have a Mac. Mines the "primary" if you will. I want to sync both the phones to "my" Mac for music, apps etc., but let her sync hers to her Mac for calendar, contacts and anything else.

    Is there an easy way to do this? Everything is networked if that makes any difference, and we only use my iTunes\Mac account for purchases of music or anything else on line.

    Thanks for any input - don't mean to thread jack.
  4. TINCAN78 macrumors regular

    Jan 29, 2008
    I have changed the library id key on both my iMac and macbook pro and it worked but now i have upgraded to Itunes 10 i have made them both the same yet the iphone 4 won't sync with the second without asking me to erase.....

    Any ideas??
  5. iPhone4sUser macrumors newbie

    Dec 18, 2012
    Easiest Way

    I've had the same problem. If anyone still has this problem....

    If you want to add music from a different iTunes library than the one yours is currently synced with, without having to click "manually manage music" and erase all the music on your iPhone, follow these steps.

    1. Make a playlist in the iTunes library of the songs you want.
    2. Click on your "iPhone" bubble at the top right of iTunes.
    3.Once there, click on "On this iPhone".
    4.At the bottom of this page (above your colourful data distribution scale) you'll see "Autofill from".
    5. In this box, select the playlist you created with the music you wanted.
    6. Click "Autofill" on the right hand side.
    7. Boom, new music is transferred!

    Hope this helped! :)

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