Did you check that your /tmp/.cemnt/mnt_sda1 was actually where your harddisk was... I had a problem with firefly media server and it turns out that my drive was by default mounted @ /tmp/.cemnt/mnt_sda2 instead...

To check if a directory has items that u need to find.... ssh in and use the command "ls" this will list every item in the current directory, for example "ls /tmp/.cemnt/" will list the drives mounted. You can then use ls and try to find your specific folder, Hope this helps.