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What does iTunes do while it's "Verifying iPod, iPad, iPhone"

I see this most often after an abruptl disconnect and plug it back in but also sometimes when doing a second sync immediately after the last sync completes.

Does it fix any errors that have occurred on the device?

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interesting question. I never saw this behavior on mine. –  Cawas Jan 31 '11 at 15:03

3 Answers 3

up vote 1 down vote accepted

Your computer iTunes is waiting for the iPhone to "fix itself" and clean up from the interrupted sync.

The mobile iTunes database (and I'm sure several others) will need to be rebuilt to clean up after an interrupted sync. You can see/test this by disconnecting your iOS device in the middle of podcast or music syncing. If you then immediately start up iTunes for iOS - you will get an Updating LIbrary screen while it itdbprepserver does its work. You'll get a "verifying message" until these post-sync and interrupted-sync cleanup activities finish. Once iTunes on the desktop has "verified" the phone is ready to start another sync, it commences with the normal backup and sync activities. My timing shows the interrupted recovery to take twice the time of a normal sync completion but usually less than a minute either way.

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Do you have any reference? –  Max Ried Aug 26 '12 at 17:20
    
I haven't seen this publicly documented by Apple, but you can see the console logs on the device when this happens and correlate the start and end times of the cleanup on the device. This has been true since before Apple put in the nice warning screen above to let you know the device is still working - you used to just have to wait for both parties to be ready for the sync to start. –  bmike Aug 26 '12 at 17:27

I think it's part of the backup process iTunes does for your iPod/iPhone. I don't believe it repairs anything on the device as such. You could try deleting old backups if you feel this message is taking too long to disappear. Backups normally speed up when you delete old ones off.

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That's not what I mean. If you abruptly disconnect during a sync and reconnect, you will see a message saying "Verifying iPhone..." –  Anthony Glyadchenko Jan 30 '11 at 2:18
    
On the iPhone or on iTunes? –  conorgriffin Jan 30 '11 at 2:27
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on iTunes...... –  Anthony Glyadchenko Feb 2 '11 at 4:56
    
It's separate from the backup process. That starts after the verify phase is complete. –  bmike Apr 29 '11 at 21:38

I don't exactly know what it's doing, but since you disconnected your iPhone during sync, iTunes was probably writing data on the iPhone.

When you reconnect it, iTunes is checking if it finished properly the last time and if not, where it was interrupted and if there is corrupted data that needs to be fixed.

That's pretty much it. I don't believe there's a process of verifying with Apple's server if your iPhone is legally activated or anything else.

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You can check that iTunes is not connecting with Apple's server if you use LittleSnitch and deny iTunes Internet access. You can also simply disconnect from Internet and the results are going to be the same. –  Martín Marconcini Apr 29 '11 at 9:16
    
Yeah the "verifying software" message during a restore is definitely a phone home, a verifying during a sync however is doubtful. –  hobs Apr 29 '11 at 21:39

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