Easier to clarify the number of drives I have with a photo.
The single drive on the far right is the unit running the Firmware version 2.10.310
Product number is different -
2 Older single bay drives = WD BCTL 0030HWT - 00
New single bay drive = WD BCTL 0030HWT - 01
Here is the new ‘slimmer’ product packaging which makes printed reference to supporting Windows 10 & Mac OSX Yosemite which didn’t appear on previous ‘cube shaped’ packaging.
