I have a My Book Duo that came stock with two 4TB WD Red drives in it, RAID0 for 8TB storage. I need to upgrade to 12TB, so I pulled the two 6TB WD Red drives out of my My Cloud RAID and put them in. WD Drive Utilities appears to see the new capacity of 12TB, but it’s not giving me the option to configure the new drives in RAID0, and the drive isn’t showing up on my desktop, or in Disk Utility.
I watched a video showing a guy doing just this, upgrading from 2TB drives to 4TB. Seemed to work like a charm.
OK, I answered my own question. And that answer is…
The Mac OS X version of WD Drive Utilities has issues. At least it did on 10.10.5. I had to borrow a friend’s laptop PC and install the utility on it to re-configure the RAID. Worked great, post-configuration scans passed… on the PC. When I tried running the scans on the Mac version of the software, they failed.
Drive came up on my desktop and formatted fine with Disk Utility. Running a Tech Tool surface scan now just to make sure, but I’m assuming it’ll be fine.
Side note: the 2 X 4TB drives that were originally in the My Book Duo are now swapped into a My Cloud NAS. Configuring those using the web interface worked fine.
Happy to help! Also glad I didn’t have to buy another enclosure for my two WD 6TB Red drives. Not sure why the utility isn’t working properly with OS X, but I saw enough folks referring to just that phenomenon that I thought dipping my toe in the PC pool might provide the answer. Glad it did!
