Just to drop in on the question of the 4096 directories arranged in a tree, that sounds like a hashmap to me. If you drill down until you find an actual file, you'll see the first 3 characters of it's name correspond to the directory path to find it. I'm guessing the filenames are hashes either of the content of the file or some other data (like the audio file it corresponds to) and the directory structure allows them to be found very quickly. To pre-empt the "why not put them all in one directory" question - because a lot of filesystems get unhappy with 20,000 files in one place!
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