iTunes could not backup iPhone because the iPhone disconnected

Are you connecting the phone to a USB port directly on your computer, and not to a hub? If it is a Windows desktop or tower computer you must use a USB port on the back, not the front (as front ports are usually an internal hub).

My USB cable is connected directly to my MacBook Pro - my iPad sync works just fine using the same cable, my iPhone always complains it can't do the back up because it got disconnected. I'm running the latest Lion (grrr instead of roar) and the latest IOS. I've deleted the iPhone back up both manually and via the preferences. In truth, once or maybe twice after deleting the back up it did work OK, but the problem came back on its own right afterwards - usually after deleting the back up it fails again on the very next sync due to disconnection. In each case it does the actual synchronization though. I've also tried powering down the iPhone and powering it up again - doesn't help.

Hey Finch,

Am unable to find the above mentioned Folder at all?!?!

~/Library/Application Support/MobileSync/Backup/

Pls Help 😟

Assuming you have a Mac, launch Finder. From the Go menu choose "Go to folder" and paste

~/Library/Application Support/MobileSync/Backup/ into the form. Include the full string including the tilde (~).

Hey Finch,

Sorry for not mentioning that i use Windows 7 and Itunes 10.

thanks

Sathya

C:\Users\USERNAME\AppData\Roaming\Apple Computer\MobileSync\Backup

Where USERNAME is the name you use to log in.

Finch......Still not working buddy 😟....I renamed the Backup folder and tried again..but its not working...:(

Thanks Finch. It worked for me. Appreciate it a lot. Was having major issues with that backup problem. All is well now.

I'm still in the same boat - none of the suggestions so far have worked for me :-(.

So I'm hopeful I've solved this for my situation. Backing up over USB always worked on my iPad but not my iPhone, so it had to be something with the iPhone and not the cable. I've tried all suggestions mentioned here without success. It dawned on me that I have wifi sync enabled on my iPhone but not my iPad, so I turned that off and I've been able to back up my iPhone three times in a row now without incident. That hasn't happened in a very very long time...

If anybody else can confirm this fixes the issue then I'll make a bug report to Apple.

I have an Apple I-Phone 3gs and have tried everything suggested above but cant back up my I-Phone, also occassionally I get USB device not recognised.

I had a similar problem with my I-pod touch and ticking wi fi sync cured this.

Lawrence,

You do indeed ROCK. I had tried all of these and more to solve my "Could not backup iPhone because the iPhone disconnected" problem. Note that each step includes a reboot of both the iPhone and the PC in between:

- Deleted iTunes.

- Reinstalled iTunes.

- Turned off all antivirus programs.

- Uninstalled all antivirus programs.

- Deleted all apps installed in the last 30 days.

- Turned off wi-fi on the iPhone.

- Swapped out the USB cable.

- Swapped out cable #2, just in case.

- Relocated cable #1 to rear USB port

- Relocated cable #2 to rear USB port

Then I found your post. Renaming the backup folder to BACKUPSAV worked. YOU ROCK!!!!!

Sathya

Forget about finding backup location.

just go to iTunes preference

select Devices

Delete backup and make a backup again

I hope it works...

That doesn't always work, if the backup is badly currupted. That's why you need to delete the folder if this simpler method doesn't solve the problem.

I simply deleted the latest backup of my device, and it seems to have fixed up the problem perfectly! 😀

Thanks Lawrence!