I realize that this is a very old post but I wanted to take the opportunity to explain how the RSS 4000 frees up disk space.
When you have recordings that you no longer need and delete them from the GUI they are moved out of their normal folder to a trash folder. The trash folder is purged once every 24 hours. The timer for that 24 our purge clock starts when the RSS 4000 is booted. For example, let's say your system was booted at 8:00 am. At 10:00 am you delete some recordings. You will not notice a reduction in used disk space until the purge runs at 8:00 am the next day. If you reboot the RSS the timer will be reset. In the example I used let's say that you reboot the system at 5:00 pm after deleteing the files at 10:00 am. Now, instead of the trash folder being purged at 8:00 am the next morning it won't be purged until 5:00 pm the next afternoon.
Michael K. Bromley, CVE, CCENT, WCNA, VCA-DCV Technical Lead Infrastructure Technical Support Center