If this happens to you, then do the following
- Force stop on Settings, Applications, All, Media Storage.
- Clear Cache and Clear Data, for the Media Storage application
- Unmount SD card
- Take out your sd card and put it in computer
- Find the LOST.DIR folder and delete it from the card
- Put the card back into the phone
- Reboot the phone
Solution 1. Clear media storage data
Read more: http://geeknizer.com/fix-android-media-server-scanner-sdcard-cpu-battery-drain/#ixzz4lIDijXJ7