Before disconnecting Drobo 1st or 2nd Generation from DroboShare or disconnecting power from Drobo or DroboShare, always put Drobo into Standby first. You can do this by clicking the Standby button in Advanced Controls -> Tools in Drobo Dashboard. Clicking the Standby button in the Commands section will put a single Drobo into Standby. Clicking on the Standby button in the DroboShare section will put all Drobos connected to DroboShare into Standby mode.
Warning: Failure to properly remove Drobo from DroboShare can cause loss of data.
The Standby operation should take only a few seconds. Once Drobo is in Standby, all lights will turn off except for the power indicator, which will turn orange. Only then, can you safely disconnect your Drobo from DroboShare or disconnect the power from your Drobo.
Disconnecting
Your Drobo from Your PC
Advanced Drobo Dashboard