Force Media Scan
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I do this whenever I see duplicates in the music list, or when I manually add and media to the device over USB.
It works with the newer phones including 4.0 ICS/Ice Cream Sandwich and 4.1 JB/Jelly bean, and now 4.2.
To test the media scanner or to clean out the media cache:
Go to settings.
Click All Applications tab.
Click Media Storage.
Click Clear Data.
Now run Force Media Scanner and click the Scan button.
It will take a long time the first time you do this, as it has to read and process each video, and music file on the device.
Afterwards, runs will be much faster, and it's just updating the media store.
It's new, so if you have any issues, please email me.
Tags: scan media storage 41, media scan, media scanner, script run media scan, nexus 4 force media scan, force manual music scan, nexus 4 rescan media, jelly bean media scan script, ics disable media scanner.
V3> Looks like media scanning on 4.2 doesn't work now that the insertion event is ignored. Updates to support external SDCards on 4.2. Yay! Works now for me!