Hm sounds like something wrong with the drive/partition itself. Someone else may be able to guide you without opening the drive but if not, look for a virgin image of the 3tb drive. Then just put the hard drive into your desktop. Boot the desktop on a gparted live usb or other distro that has “dd” and sata support. Identify with parted or fdisk which dev name the drive has (like /dev/sda) and just overwrite the whole thing with the virgin image (NOT THE SAME AS ROOTFS.IMG) by doing dd if=input_virgin_3tb_image.img of=/dev/
Here is my previous thread about recovering my 2tb (only the full virgin image worked for me):
http://community.wd.com/t5/WD-My-Cloud/Please-help-me-debrick/m-p/699320#M9926
I would think the only difference is the ending point of the data partition but I don’t know enough about binary images to alter the 2tb one for you.
