Internal hdd won´t sleep, when booting from firewire. How to spindown?

Hi,
when I boot my powerbook from an external firewire drive, the internal hard drive does not spindown, no matter, what the disk sleep setting is. I tried pmset and the SpindownHD tool, provided by Apple´s CHUD, but the internal drive remains active, all the time. I can also unmount the internal drive, but no matter what I do, it won´t sleep.
Any advice? Thanks.

I ended up re-installing Yosemite 10.10.2 on both drives, and things are (so far) back to normal. I'll be back again if I have this problem recur.

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Internal hdd won´t sleep, when booting from firewire. How to spindown?

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