Firewire drives not showing up

I did the most current updates yesterday, firmware etc... Now my firewire drives will not show up. What do I need to do? I rebuilt permissions, ran Techtool Pro 6, Ran CleanMyMac and still has not changed. Running LIon

Well didn't get an answer here so I decided to connect yet another hard drive to MBP. it worked. the two drives I was trying to mount were the ones that I had connected during update of software and firmware. this tells me that it fried the firewire 800 ports on drives. The lesson for me is to unmount/dis-connect external drives during firmware updates.

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