Occasionally, while running, I occasionally* get a loud TICK, like maybe the hard-drive is parking the heads with a vengeance. Its not continuous, the drive continues to spin normally (that I can hear at least) and have the normal head-moving noises.

No gaps, no errors on serial output.

Is it just parking the heads violently perhaps? I don't hear it regularly tho. Maybe once or twice every couple days, but I could be missing it over the music.

* School of Redundancy school