Deleted data on external HDD after upgrading to Mavericks

Hello everyone,
I have a Mac Mini 2011 with Lion Montain and two external drives, one 500GB and the other is a 4TB WD mybook, both Firewire.
I have updated the system at Mavericks, everything went ok all the disks were visible and everything worked perfectly.
I regularly off the MAC (the firewire drives go out on their own), the next day when I restarted the MAC I was surprised to see both disks completely EMPTY, as if they were formatted.
I made a disc scan with Data Rescue 3, the data are present and recoverable but are clearly reconstruct the entire folder structure with a huge job.
Do you know what happened and if there is an alternative solution to recover data?
Thanks in advance for your answers.
Max

What are you trying to do?
What have you done so far?
What is on your boot drive, where else is your data located and what is it?

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Deleted data on external HDD after upgrading to Mavericks

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