Re-Detecting Plug and Play Devices
From LinuxMCE wiki
Sometimes LinuxMCE gets trouble detecting new children devices, added later (like adding new mounted NAS storages to the FREENAS device)…
You can delete the QUEUE in database and then LinuxMCE will rediscover them.
Use the following command lines:
sudo mysql –uroot
delete from PnpQueue
After that, you will need to reload router and re-add the mentioned devices.