I have just been using one of my 4TB My Book external disks on a MacBook AIR running 10.10.4
All well and good. Only 1 installed at a time using the USB port.
But the system told me there is a WD update so I installed it. Immediately after installing WD Drive Utilities and trying it out the WD disk on the desktop greyed out, then vanished completely. I pulled out the USB cable and put it back into the MacBook. The desktop icon for the WD drive reappeared, but greyed out, then vanished.
So I thought it must be the new update so I uninstalled it using the WD Uninstall program. Same problem. I have an older (2014) WD Drive Utilities install-software on a MyPassport drive so I plugged in the USB for that drive, same problem, that is also greyed out and then vanishes from the desktop.
So I tried the My Book again, using Disk Utilities in the MacBook. It sees the drive at first, but then it vanishes within 5 seconds. Disk Utilities says “Error: A disk with a mount point is required”.
I am very loathe to plug in my other 2 MyBook 3TB drives in case these also vanish or become unuseable for this same reason. I have a huge amount of data backed up on all of these disks. I think the disks are okay and maybe if I can get hold of older WD software from 2014 then I can backtrack and put it back the way it was. As a first step does anyone know where I can get hold of older WD software such as Drive Utilities (I think that was the one which did it). Or is there some files it has installed on the MacBook hidden away somewhere which I can delete?