[squid-users] Cache distribution algorithm. Please enlighten me.

Ok, "du -sh *" at my squid/cache folder gives me the following output

598M 00
606M 01
377M 02
1.1M 03
1.1M 04
1.1M 05
1.1M 06
1.1M 07
(...)

So, can someone explain me what distribution algorith is used? Is this suposed to be like this?
It seems like when setting up squid.conf , we could say:
 "Ok, 1 want ... hmmm.. 1 Gb cached, so I'll only need 3 top directories..."

Thank you

-- 
"Put your hand on a hot stove for a minute and it will look like 2 days.
 Go out with a nice girl for 2 days and it will look like a minute.
 That's RELATIVITY!" - Albert Einstein
João Pedro Clemente - jpcl @ rnl.ist.utl.pt - Linux 2.4.16 on a i686