Hi all, my 12TB drive makes a jagged sound after a few seconds when booting up (power on, resume from standby etc). "clack-clack-clack-clack-clack* (five times). No noises are audible during operation/under load. Write/read values and speeds as expected. SMART/fsck are inconspicuous. The disk was filled to approx. 10% on a test basis, all files without checksum errors. The SATA data cable was replaced as a precaution, without effect. Is this "normal" or should I have the disk replaced?