If your diagnostic tool flags a -30b current anomaly on the 5V rail, retire the drive immediately . Do not wait for S.M.A.R.T. to report a failure. By then, the actuator will have already scored the platters.
But instead of writing the data in neat radial sectors, Bertha began to sing . hard disk 5 -30b-
Boot into Linux (Ubuntu Live USB recommended). Identify the suspect drive: If your diagnostic tool flags a -30b current