iTunes for Windows: Device Sync Tests

iTunes for Windows includes Device Sync Tests within iTunes Diagnostics.

Device Sync Tests can assist you in troubleshooting an issue when trying to sync your iPhone, iPad, or iPod touch in iTunes. This can assist with issues around syncing contacts, calendars, mail accounts, bookmarks, and notes over USB on your computer.

Note: iTunes Diagnostics is used to gather and display information about your computer—it does not resolve issues itself. You can use the information provided in the diagnostics to troubleshoot an issue you may be having, but you may need to follow specific steps in a related article or have assistance from an Apple Advisor to resolve an issue. See the sections below to learn more about the content of iTunes Diagnostics and find related troubleshooting articles.

To run Device Sync Tests, follow these steps:

  1. Install the latest version of iTunes.
  2. Open iTunes and choose Run Diagnostics from the Help menu.
  3. Make sure "Device sync test" is selected and click Next.

While the test is running, a Command Prompt window should appear:

Command prompt window with pathname in title: "C:\... SyncDiagnostics.exe"

Once complete, the resulting information (sample shown below) can help you troubleshoot syncing issues related to iTunes.

Example: "One or more Sync tests failed." Next and Help buttons appear.

When the results are displayed, a status light appears next to each test. A green light next to a particular test indicates that no issues were found. When iTunes detects an issue with a test, a red or yellow light is displayed next to a Help button. The Help button will display troubleshooting information in iTunes or on the Apple support website that may resolve the issue.

In addition to the status lights and support content, iTunes can display a detailed report of the computer's configuration and connectivity test results by clicking Next. This report has several sections which contain different information.

Understanding the Device Sync Tests report

General system information:

This first section of the diagnostics report displays the following general information:

  • Windows version and build
  • Make and model of the PC
  • Version of iTunes and QuickTime installed
  • Whether or not the current user profile has administrator privileges

Device Sync Tests:

This section of the diagnostic report shows if the Device Sync Tests were successful, and may include information on why the issue is occurring.

Learn more

For specific troubleshooting steps for issues syncing your contacts, calendars, bookmarks, mail accounts or notes over USB with iTunes, follow the steps in iPhone, iPad, iPod touch: Troubleshooting contact and calendar syncing via USB on Windows.

When all Device Sync Tests are finished, a summary will be displayed which you may copy to your clipboard or save to your computer. You can also send it to Apple.

To save to your computer:
Click the Save button. Choose where to save the files on your computer and click Save. This saves two files in the location specified called "iTunes Diagnostics.RTF" and "iTunes Diagnostics.SPX". You can view the RTF file with a text editor. You may also share both files with others who may be assisting you in resolving your issue.

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