I'll bet good money I'm the only one silly enough to try it outside the SB/empeg guys. From the release notes of b13.

The player now supports a partitioning scheme for the fids directory, which
should improve performance when rebuilding the database. The partitioning
works by e.g. FID 34da0 is placed in (e.g.) /driveN/fids/_00034/da0,
where N is 0 or 1, according to the player's normal rules. Essentially,
the number (in hex) is zero-padded to 8 characters (xxxxxyyy) and saved
as _xxxxx/yyy.

Note that the player won't create directories of this form. A future version
of the player will. This code was partially back-ported, in order to
allow v2.0 betas to work correctly on players which had music added by v2.1
player code.



I tried it, didn't seem to make much difference to performance to me. I wrote another script to convert it all back to the old way tonight. BTW It also breaks the Hijack HTTP playlist stuff. I'm sure Mark will fix it as soon as it becomes the standard though.