kradio and 'furious' HD activity

I am running SUSE 10.1 with the latest upgrades of KDE3 (3.5.4). I noticed that when I start KRadio the HD starts 'furiously' working - don't know if something is being read by KRadio or something being written to disc. This activity doesn't stop - until I shut KRadio down. Anyone know why the HD goes into a state of hyper-activity when KRadio is started and, more importantly, how to stop this activity? Cheers. -- This computer is environment-friendly and is running on OpenSuSE 10.1