Well, -B is for Advanced Power Management, which your drive may or may
not support. If it doesn't, -B is just ignored I guess. The -S spindown
setting is independent, so if you set it to 12 you get spindown.

/etc/laptop-mode/laptop-mode.conf contains a block starting with this:

# Should laptop mode tools control the hard drive idle timeout settings?
#
CONTROL_HD_IDLE_TIMEOUT=1

In the following settings, LM_AC_HD_IDLE_TIMEOUT_SECONDS=60 gets
translated into -S 12.

You should change this if you don't want your drive to spin down.

Although you see a different behaviour in Hardy, I am not sure this is a
bug, since it is consistent with the man page as I understand it.

-- 
harddrive spins down when it shouldn't in laptop-mode
https://bugs.launchpad.net/bugs/286846
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