To disconnect a drive that is connected, highlight that drives row and hit the Disconnect Drive button, or right click & select Disconnect.  If you want to select multiple drives to disconnect at once, hold down the Ctrl key while highlight each row you want to disconnect, and when finished selecting the rows, Disconnect Drive button. When multiple drives are selected, NDC attempts to disconnect them in the order they appear, not the order selected. In other words, the topmost selected drive will disconnect first, then the next one down, etc. The display will refresh after the disconnection attempt(s) are finished.