Do not Disconnect was implemented on Apple iPods to prevent data loss by warning the user not to disconnect the iPod while it is still in use on the computer. This message should be taken serious most of the time as it can have disastrous consequences. . If you transfer files to the iPod for instance and unplug the iPod from the PC during the operation, you may experience data loss or file corruption afterwards.
Sometimes however the message Do not disconnect appears although all transfers have been finished and iTunes has been closed. But don't worry, you can try several things to make the message disappear.
If iTunes is still running on your computer system close it and see if the message disappears. If that is not the case start it again and click on the Eject Disk icon in the lower right of the screen.
Ejecting the iPod in iTunes basically disconnects the tie between the iTunes software and the iPod, so that you should be able to disconnect the device from your computer afterwards without issues.
If that is not the case you will have to do the following. The iPod is connected to your operating system and should appear in the list of connected devices.
Right-click the iPod and select Eject from the context menu. This should remove the iPod from the list of devices and thus break the connection to your operating system. If the message still appears try searching for programs in the task manager that are related to your iPod and kill the process.
If the Do not Disconnect message still appears on your iPod you could try and simply disconnect it anyways. Just make sure that nothing is running in the background that is still communicating with your iPod. It should not be a problem then.
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