I am getting an actively refused error when I try to connect to the betaftpd server and this is probably a common error.
Have you disabled to in-built Humax FTP Server before using betaftpd, with Menu >> Settings >> System >> Internet Settings >> FTP Server = Off?
Do you have anything mounted into the file system - a network drive or a USB drive - to avoid accessing via the "storage" option? These can confuse the disk usage figures.
What I am trying to find out is whether you have any network drives mapped into My Video, which could confuse the disk occupancy. It is also possible to map USB drives in the same way.