Wow that last post was a lot of stuff.
Lets try to simplifiy. Anyone doing this stuff already knows about SSH.
Remove all WDMC .dirs:
find /mnt/HD/HD_a2 -name .wdmc -exec rm -rf {} ;
Stop the service:
killall wdmcserverd ; chmod -x /etc/init.d/wdmcserverd
killall wdphotodbmergerd ; chmod -x /etc/init.d/wdphotodbmergerd
Must be done again after hard power cycle.