Use this dialog box to enable automatic media discovery in the library.
When you select the default media type and then click Yes, new media is automatically discovered and assigned to the default scratch pool, whenever new media is found in the library.
Click No if you wish to manually discover media in the library. Ensure that media is discovered, before using the library for a backup operation.
Select Default Media Type
Lists the media types available in the library. Note that the default media type must be compatible with the drives attached to the library.