Strange thing: suspending the laptop makes the drive spin down normally (no noise).
Different methods of spinning down the drive when suspending and halting? -- Unsafe HDD (bad noise) spin down when shutting down Edgy Eft https://launchpad.net/bugs/68660 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs