Cannot Daisy Chain My External Hard Drives on Macbook Pro Unibody

I have a 2010 Macbook Pro 13.3.  I am trying to daisy chain my 2 external hard drive enclosures to my firewire 800 port.  The enclosures are manufactured by Vantec, model Nextar 3.  Both devices have 2 firewire 400/800 ports and they advertise that they are able to be daisy chained.
My issue is:  I hook one to the other and power them both on and nothing seems to happen.  I can power one up and the drive will show up on my desktop, but when I power the second drive up, I get the pop up screen saying I have disconnected my device without properly shutting it down, and then the drive is gone.  I have tried connecting them several different ways.  Im not sure if its the external enclosures, if there is a process I'm supposed to follow, of if the Macbook Pro Unibody does not support daisy chaining firewire 800 devices.
Please, if anybody has had the same experience and has been able to fix it, let me know.  I am in need of some serious hard drive spance and am going to return both enclosures if I cannot get them to work.
Thank you.

I'm having the same issue.
I'v also found that I am able to daisy chain other drives throught the vantec drives.
And that, when  I get the pop up screen saying I have disconnected my device without properly shutting it down, and the drive is gone. I'm only able to remount the drive after restarting the computer while the drive is conected and powered. It won't apear on other computers untill the reboot sequence is preformed.
Strange,
Let me knwo if you've found a solution.
thanks,
joe

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