the workstation can only recognaize it after installing the card reader's driver. why?
Do you mean "USB for RDP Workstation" or your PC which is workstation? Anyway please enable auto-redirecting on USB for RDP Workstation and replug the device. It will be redirected fine without the drivers on the workstation's side.
thanks for your answer. I installed usb for rdp workstation on my pc. The problem is that if I don't install the driver on my pc, the usb for rdp workstation software can not recognaize it and redirect,even i check auto redirect option.