Why two WD icons in my menubar for one WD Mystudio Drive?

I have a new WD mybook studio drive on my Mac running 10.9.  I installed the WD software so I could change from RAID0 to RAID1.  My drive seems to be working properly, but I get two WD icons and two drives are shown in Finder. One is MyBook and one is EFI.  What is EFI and why is it there?  Can I delete the WD software now that I have my drive set up as RAID1?  MUST I delete the WD software to avoid data loss?


Update: I ran the WD software uninstaller once I noticed people with data loss problems were seeing two mounts, one called EFI and one called Mybook. Now that the software is gone, I only have one called Mybook.

Hello r0kdotorg,

Thanks for sharing. I’ll forward this to the proper department so they can run some test.