Use the flat end of a spudger to lift up and unlock one side of the data cable's connector on the motherboard. Repeat this step on the other side of the connector.

You'll hear a faint click noise when unlocking the connector. Make sure not to apply too much pressure when lifting up on the connector with the spudger, or else damage may result.

Gently pull the optical drive data cable straight up and out of its socket on the motherboard to disconnect it.