Use nomedia app from market.
Select any folder you dont want to seen in album/walkman etc. applications.
Nomedia will generate .nomedia file in every folder you select.
Clear data of Media Storage from Settings>Apps>All
That will erase all file index. Media storage will generate new file index in afew minutes, but this time will exclude your folders.
All generic album/player applications uses this index. So any of them will see your files.
Also you may rename any folder with single . dot.
For example. .mypics .myfiles
These folders will exclude from file index.
Dont forget, if you rename basic folders like .DCIM. system will generate new DCIM folder.
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