I Need advise with laptop-mode-tools

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https://bbs.archlinux.org – Hello,I installed the laptop-mode-tools to control my external harddrive. I followed closely the wiki and I managed to configure the /etc/laptop-mode/conf.d/usb-autosuspend.conf exactly, it is explained in the wiki. It works (kind of) but I don't know this is the right behaviour. It powers off my external harddrive, but after a while it powers it on again even if I don't touch the external harddrive. I thought when once the harddrive powered off it remains so until I use it. Is this the proper behavior of the laptop-mode-tools program? These are my configuration settings (Exactly the (HowTos)