adobe livecycle gds(filesystem) not decrease size after purging process

Hi,

my customer has large gds=130gb on filesystem.After i purged all processes(20,000-Completed,Terminated) , size of the gds folder remains the same(130gb).

Now there is still around 10000 running process. On my dev machine i purged processes and i freed around 2gb from my C drive. Can you give me a hint, where to look at? Why not purging release disk memory/ thank you