I've spent days trying to upgrade my Blue Ring 1Tb into a 2TB using a regular WD USB drive (disk is a WD20EADS) which I purchased. I've used two techniques found on this forum and neither worked - the drive will simply not boot as far as getting an IP address, and no lights flash. The partition structure etc looks OK as far as I can tell with my inexperienced Linux eyes.
So, in the absence of any info which might help me achieve that goal, I am going to return the drive to being a regular WD USB driver. HOWEVER - I don't know how to format it properly to do so, either the settings or the commands. I believe it's just one partition, which I now have, but it is not a RAID EXT3, which I believe it should be. I tried using MDADM with some switches but I didn't have the devices correctly defined so gave up in case I caused yet more mayhem. (btw I've used an image from here which has given me the WD Smartware in a 644 Mb partition on the drive, which appears as K in XP, but I can't "manage itr - i.e. delete, format etc that partition) - although in DISKMGMT.msc it shows me a healthy unknown partition of 1862Gb, which must be the 2Tb disk, but all I can do is delete the partition "The selected partition was not created by Windows and might contain data recognised by other operating systems. Do you wish to continue" So I did that, and it's gone :-)
When I have the 2Tb attached to my MBWE fdisk -l shows me one large partition.
Anyone have any ideas please?