wow on RAMdrive

[Michellangelo]

Hello,
I have 24 GB of RAM, so I created 20 GB RAMdrive and played WOTLK content on my ultramega fast drive . But now i have problem, because CATA added another 6 GB of necessary data - 23,5 GB is too much for my RAMdrive.. Bcoz all MPQ files are basicly compressed, i can´t load it now from RAMdrive .
Someone told me, in DATA folder are some files with old world data - before CATA changes (old Kalimdor etc.) and they´re not necessary for Playing wow. Is it true?. Is any option how to reduce wow folder under 20 GB ?