There are certain issues when it comes to updating the SD after you have made changes in to it.. say added new wallpapers through you PC or online downloaded it.. Or you changed the file names using AndExplorer or similar software… So there are some applicationss which invokes the media scanner to rescan your SD card for new media files..
There are many tools which can be used for these purpose.. SDRescan is one such tool i use for those purposes.. Because my files din’t get refreshed..
I would rate this application 4/5 as it is very quick an useful.. All i have to do after changing the placement of my files is open this application and it automatically would refresh my SD.. And the best part about it is it’s faster..