I connected a flash drive to the system and UD detected.
It took a while for the page to refresh i.e. 20-30secs
At this point the parity drive sdk had spun up and I have 4 drives showing in the UD on dashboard.
Dev4 is sdk
i have attached syslog for period of plugin.
Unplugging flash drive Parity drive now shows active on dashboard and dev 3 and 4 disappear.