# You cannot determine which port to insert the USB flash drive

If you are unsure which port to insert the USB flash drive in, use this information to ensure that you are using the correct port.

## About this task

You should use one of the USB ports that are associated with the node canister that was used when you verified the system status LED was blinking.

## Procedure

1. Determine the USB port that is associated with the node canister that you used to confirm the system status LED. For both the upper and lower node canisters there are two USB ports that you can use to insert the USB flash drive. Use one of the USB ports that corresponds with the node canister that you used to verify the system status LED.
   The USB ports are directly underneath the Ethernet ports. The following diagram shows the location of the USB ports for each node canister:
   Figure 1. USB ports on the node canisters
2. Ethernet cables can be obstructing your view of the USB ports. If you need to move these cables to insert the USB flash drive into the USB port, check whether you have dislodged any cables and reseat them, in necessary.

Parent topic: The fault LED does not start blinking or stops