Seagate ext disk doesn´t show in finder when booting

Hi there.
Odd little problem here.
My Seagate ext disk doesn´t show when I start my iMac. When my iMac is up, the disk has started, but is not yet discovered. I just unplug and reconnect the FW cable, and it shows up right away. Seems like it just dont pick it up in the starting sequence.
Any ideas?

I'm guessing it's something to do with the firewire protocol, I'm not sure if there actually a fix for this.
It could be possible to make an Automator action that would 'search for firewire devices' to run at user login?
Regards,
Peter.

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