"iTunes could not sync data to the iPhone because the iPhone disconnected"

Discussion in 'iPhone Tips, Help and Troubleshooting' started by swindmill, Mar 10, 2008.

  1. UncleRichard macrumors newbie

    Apr 17, 2008
    Could use Time Machine

    If you haven't added or deleted any contacts recently, or you are not too worried about possibly losing some you have added and having to delete some you already have, before you follow these steps you could restore your address book from Time Machine, going as far back as you are comfortable with.
  2. Awarenessing macrumors newbie

    May 12, 2011
    A faster solution to finding a corrupted contact that leads to iPhone disconnection

    Thanx for this great insight Timmya. What I did to find the corrupted contact which was a bit quicker but relied on my memory was:

    1. Create a new group, say: "almost everything"
    2. Go through your contacts and add everything to this new group bar contacts that you think you might have modified or imported since the sync problem began. Make sure you keep a note of the names of all the contacts you exclude as you'll be including them later one by one.
    3. Sync the phone with only this group ticked in iTunes (i.e. uncheck the "all contacts" option)
    4. Add the contacts left out of "almost everything" one by one, syncing each time to see if the problem occurs.
    5. As soon as the problem occurs again then you know the trouble was with the last contact you added to the group and you can go and delete that.

    In my case it was a contact I'd received via email as a vcf file that seemed to have been corrupted.

    Once again Timmya thanx for the original idea of one corrupted contact subverting the whole process. You'd think by 2011 the computer would tell you that rather than some irrelevant message about "disconnection". But oh well, it's only the brilliance of these systems that has me expecting perfection from them :)

    Good luck.
  3. slickmick macrumors newbie

    Aug 12, 2011

    sync your osx address book with your gmail contacts and problem is solved!

    first sync your contacts from your original data (phone) with gmail contacts.
    then export these into address book application
    then sync the new data (keep new in address book when asks and delete duplicates and other unwanted info) with itunes

    This worked for me when all other methods failed to!

    Good luck!
  4. Sylar, Oct 16, 2011
    Last edited: Oct 16, 2011

    Sylar macrumors newbie


    Aug 17, 2007
    Charlotte, NC
    I found that 3rd party sync cables were the culprit for me. As soon as I used the OEM cable that came with the iPhone, everything was fine.

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