Sony PCG-R505JSP Manual

You may disconnect the notebook from the docking station when the notebook is 
off or on. 

However, do not disconnect the notebook from the docking station 

while the docking indicator is on, while the notebook is in Standby or Hibernate 
mode, or while battery power is low. If you do attempt to disconnect the docking 
station in any of these three states, you may lose data or the notebook may 
malfunction. 

Follow one of the two procedures below to disconnect the docking station when 
the notebook is off or on.

Before you begin, disconnect all peripheral devices (i.e., i.LINK devices) from 
the notebook and the docking station. Also, remove all objects placed on top of 
the notebook.

Pull out the two release levers on either side of the rear corners of the 
docking station, to release the notebook from the docking station.

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When the battery is low, turn off the notebook before you disconnect the docking 
station.