Recovery options for Mavericks MyBook/EFI data loss

Has anyone managed to recover full directory structures for the following data loss scenario?
OSX Mavericks 10.9
Any external drive initialised to a single MyBook partition with exposed EFI partition
WD Drive Manager / RAID Manager installed

If your data loss meets the above criteria then please:
open a support case with Western Digital
open a support case with Apple
If you are an Apple developer then please submit a defect report to Apple.
More reported cases = more attention by both Western Digital and Apple.
Please report your data loss on these forums, the WD community forums and here with the following information:
mac model / description
external drive(s) model, capacity, connection, paritions, empty name
eg MacBookPro9,1 (mid 2012 MacBook Pro Retina) and WD MyBook Studio II 6GB connected via Thunderbolt with 2 partitions reappeared as single empty MyBook and exposed EFI partition
You can find your mac model number using Apple menu > About This Mac > More Info... button under Hardware Overview: Model Identifier.

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