I have iTunes on a Windows 10 computer. I keep all music in iTunes synced to an iPod Classic and to an iPod Touch.

However, when syncing to either device, iTunes recopies some tracks each time. The track names appear quickly, so it is difficult to read them. The number of tracks it recopies varies from time to time, but is usually around 100, whereas I have a few thousand tracks synced.

Why is this happening? How can I fix it?

PS: When syncing today, iTunes recopied 154 music tracks to both devices. I have not added tracks to my library or edited any metadata since the last sync, which also recopied these same 154 tracks.

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