Urgent!!! mavericks wiped out my entire backups and data on external devices

I've upgraded to Mavericks recently. It's working fine on my 13-inch retina macbook. I'm currently using 2 external drives for time machine backups and also storing my work related data and iTunes files on these external drives. This morning when I when switched on my macbook strangely it gave me incorrect external drive name. When I looked into the 3TB disk it was blank. I've ejected the drive without writing to it.
Any suggestions or tools to retrieve data wiped in OSX?
My entire music and dvd archive and 20 years of work related data are gone!!!
Thanks in advance.
Sertac Orcun

FIrewire & Thunderbolt drives are having issues with Mavericks, avoid same until a fix is issued if you can.
many are reporting same, there is a firewire fault and TB HD on external HD from LaCie (Seagate) and from WD especially.
Technicians are looking into it.
Until there is resolution, consider setting up a USB ext. Time machine HD.
Until then consider confining Mavericks use with USB HD.
Ive tested a very long line of USB HD on Mavericks, all seem fine.
*However some are reporting now even USB HD are having problems IF they are running WD software
Recommend anyone DO NOT ATTACH any WD MyBook externals (firewire, thunderbolt or otherwise).     
I dont have same to test, so I dont know if the problem is in the firmware on the SATA bridge or if its a problem with the WD software

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