Serious external drive problems after installing Mavericks

OK, so now I am seeing multiple external drive problems. Here is my setup: A GTech 4TB drive connected to MacBook Pro via Firewire, formatted of 2 partitions of 2TB each (called GT1 and GT2). This is then daisy chained to two WD drives of 2TB each, called WD1 and WD2.
After installing Mavericks everything worked fine (in fact I have an amazing speed increase). However, after restarting my machine this morning I have the following issues:
The GTech is now a single partition called MyBook (obviously a hangover from the WD drives. I suspect the WD drive managment software) with NO data files. Interestingly it shows the following USED 1,106,870,272 bytes (1.11 GB on disk). This suggests that one of the partitions has disapeared completely.
Whilst WD 1 launces ok, WD 2 causes the Finder to relaunch whenever selected, meaning I can't get to the files. I remember having this problem before when I upgraded to SL, and it having something to do with hidden files that needed to be deleted via the terminal. However, I have searched the web and can't find the solution again.
Given that WD 1 and 2 are my backups of GT 1 and 2, then I now have a situation where I cannot access my primary or backup files for GT 2. Very impressive - not!
Can anbody remember the hidden file solution for the finder relaunch?
Can anybody help me get back my GT1 and 2 partitions (as they have the latest work on them)?

FIrewire & Thunder bolt 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.
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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