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Many applications search the entire sdcard for data files, for example, a common music player will search the entire SD Card for all audio files, including .mp3 files. This can be undesirable for (a) purists that wish to have certain files for certain purposes in specific organized and standardized places and (b) people that have audio files in certain folders they do not want showing up in the new media player just installed.It is true that Android blows away file system and storage convention, by trying to make it seem as if there is no need for structure of the file system. The design is supposed to be a "stick it in and it just finds the stuff and works" designed for the lowest common denominator. Unfortunately, a lot of technology is heading down this zombie minded road.=== Hiding Media Files ===If you have a folder with files, such as .mp3 files, and you don't want them to appear to applications that scan the entire card contents, just put a .nomedia file in the folder and it wont see them. Save a null file as “.nomedia” and make sure that the Save as type is set as “All Files” instead of “Text documents.” Copy that file to the folder on your SD card containing audio files you don’t want to show up. You may have to reboot the Android after doing this.Also, any folder whose name begins with a period, such as .secretmedia, will be invisible to scanning software also. A folder beginning with a period in the Linux / Android world is like a folder with the hidden attribute set in the Windows world.