@ sir boylit,
the android based media players are mostly 1 port, 1 device and does not support Probox's multidrive, multi USB devices (android (i use Hi media) will only see the 1st drive), so i ended up for my 720p/1080p collection in JBOD/RAID0 (4 x 3TB) running on ProRAID 4 bay encolusre (alternate to this, try mo po sir yung kay garfield na 4 bay RAID-0 or JBOD.)
for your purpose, my suggestion is to go JBOD to see all drives in one flat directory, the downside is you'll have to copy your files over as it does a reformat on drives. if that is not an option, my PCH C200 indexes naman all 2 x 8 drives (Probox 8 bay) via its jukebox so i think that would work for you. Sigma chip pa!