Sync the database and tags

Even if you remove tags from your files, your library will still display the information stored in the database fields. You can update your database to reflect the information in your tags, or you can update your tags to reflect the information in your database.

Go to Tools | Library Tools and select from three actions:

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Update Tags from Library. By default, Media Center updates tags when the file information changes in the database (you can change this setting in Tools | Options | General). But you may want to force an update, if, for example, your files’ tags got corrupted by another program.

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Update Library (from tags always). This setting will always update the library from the tags.

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Update Library (from tags if change detected). This setting will only update / read the tags if the file's last modified time is later than the last time we analyzed the tag. If you change some files with an external program, you can quickly update Media Center with "if changes detected".  However, if you want to force MC to reread everything, you can use "always".