If you’re looking to put a end to iTunes overly aggressive syncing, Sync Blocker is a free application that puts an end to automatic iTunes synchronization and keeps your iPad, iPhone, iPod, and iPod Touch data from being accidentally deleted.
There are settings within iTunes you can toggle and even keyboard shortcuts you can use to temporarily suspend the syncing while mounting your iOS device. If you want to skip that hassle, however, and rest easy knowing that your iOS device will only be synced and updated when you give an explicit go ahead, Sync Blocker is a free application for both Windows and Mac OS X machines that completely blocks iTunes from syncing without your permission.
Previously $22, Sync Blocker is now free. Hit up the link below for additional information and to grab a copy of the software.