Feature requests
Hard disc configuration is only one of a myriad of issues you need to build in to make this an industry leading product.
Most obviously make sure the network connection only accepts CAT 7 cable as that is known to sound better than CAT 5 - http://mobile.extremetech.com/latest/80702-increasing-the-sound-quality-of-your-music-by-switching-from-cat-5-networking-to-cat-7
You should also build in the ability to ambiently condition fields - sadly the go-to after-market product in this genre is discontinued - http://www.lessloss.com/blackbody-p-200.html - but if you could build in these facilities that would certainly be something no competing vendor could match quickly, giving you a clear market lead.
Next, you should probably ship the audioNAS with many specially selected pebbles, and magic tape, so that they can be attached to audio connectors. This substantially increases the soundstage and depth of the audio image. http://www.machinadynamica.com/machina31.htm
Finally, be sure to ship your product with super fuses. It's well known how the standard fuse can cause many issues with sonic reproduction and seriously limit bass response. After all: not all 13A fuses let the same amount of current pass. http://www.russandrews.com/product-Russ-Andrews-13A-SuperFuse-1016.htm
If you address all these issues, the reception to your product in the audiophile community will be out of this world.