Nikon D300s - Manual (Page 251)

225
Q
Direct USB Connection
Connect the camera using the supplied UC-E4 USB cable.
1
Turn the camera off.
2
Turn the computer on.
Turn the computer on and wait for it to start up.
3
Connect the USB cable.
Connect the USB cable as shown. Do not use force or attempt
to insert the connectors at an angle.
4
Turn the camera on.
D USB Hubs
Connect the camera directly to the computer; do not connect the
cable via a USB hub or keyboard.