Sharepoint service log files grow rapidly

Recently I noticed that I run out disk space in my virtual machine where I install Windows sharepoint services.
I see that the log folder grows very big in size. It is already 2 GB now.
The default log folder is located here :
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\LOGS\
To avoid it consumes space in C, I change it to different folder which is achieved through:
Sharepoint central administration > Operations > Diagnostic logging.
Then I also change timer job definitions by disabling them (maybe I will enable them once I know more about sharepoint).