Need Help with Firewire drive

I got a Seagate HDD in a Vantec Firewire enclosure. Every so often when my IMAC awake from sleep, the External Drive look like still in sleep mode. It is not responding at all. I cannot hear the HDD spinning.
The only way I can get the drive to work again is by turning it off, then unplug and plug the firewire cable back. If I just turn the power on and off on the external enclosure, the HDD wont spin at all.
I know the external enclosure and the HDD work fine because I tested it on My PC and it work fine without any issue.
Is there a way to turn off the power management for the IMAC firewire port or any solution to resolve the drive stop responding after wake up from sleep? This could happen 2-3 times a week.

Not going to hi-jack this thread with my issue but I'm experiencing some very odd (and not too far off) behavior like this with a Seagate drive (However it's a FreeAgent Desk | Mac).
YOU ARE NOT ALONE! Something must be going on. I'll edit this post with a link to my post once I'm through searching (Came across yours, wanted to see if I could find an existing Seagate / Firewire issue.

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