Content Server on Filesystem Directory Structure

Hello,

one question about the SAP CS. We implemented the possibility to archiv files on filesystem and not in a DB. For each file we archive the CS creates a directory on filesystem with following structure:

5bs3

0d3a

83hu

So 4 characters a-z and 0-9, which allows 36^4 possibilities (1.679.616(1,7Mio).

So my question: what will happen at file 1.679.617 ? Does the CS continue with 5 letters or something like this ?

Anybody any  experience?

Thanks

Lukas