For instructions to reset the mediastore database proceed to step #4.
Applications such as music players, gallery applications and USB connections to your computer, retrieve information from the mediastore database. Each version of Android has become more dependent on this database to find and organize content. Which means a corruption in the mediastore database can occur more frequently, causing many weird problems. Refreshing the mediastore database is the only way to force the database to rebuild itself fixing the problems the corruption caused.
source: gmanapps (2012, January 25). [Howto] MediaStore Database Rebuild Msg 1]. </p>
The following tutorial will explain on refreshing the mediastore database in detail. Proceed through this tutorial when you have the ability to leave your device alone for a period of hours (e.g. before you sleep) when we refresh the mediastore database we need to give it time to rebuild before we try using it again. Note: Resetting the mediastore database will remove ringtones, Android created playlists and notifications. It has been reported that Android gallery apps may also be affected.
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We don’t know when the media database is rebuilt and ready to be accessed again. iSyncr is equipped with a “notification” feature letting you know if the Android media database is still being rebuilt. After this notification disappears, we know that the media database is rebuilt and able to be used again.
Note: When this notification appears, it does not mean iSyncr is active or working, rather it is only “notifying” you that the media scanner is running.