Well sir, I now have a partitioned (1.37TB each volume, x2) running successfully on my WD TV Live.
Huzzah! Thanks for your comments and advice - they have been really helpful.
I actually did this before reading your Linux suggestion - and it's a good job, as I would have given up at that point
I paid for the full licence key for Acronis DD 11 and found, to my horror, that although it created the separate volume, it wuldn't format it.
However, as the first partition was already up and running, and the second volume was now 'seen' in my computer, I did the windows quick format on it, at 4096 bytes, and it worked. For future reference, under the Disk Management control centre, the second partition is coloured light-blue and noted as being a 'logical drive'.
For those who may want to try this at home, it's possible that Acronis got the drive to the feeble state that Windows format rescued it from in the trial version, so buying the full program may not even be necessary.
For the record, Partition Wizard doesn't acknowledge the volumes still, but re-connecting to my computer brought up autoplay options for each volume in succession.
So, thanks again, RoofingGuy; kudos headed your way
As for WD, I think they're being a bit naughty about this - apparently, from January 2011, the industry standard for Hard Disks will be to be manufactured with the 4096 byte clusters as standard. They must know about this but have said nothing thus far, when they will soon be faced with a player that will not be compatible with newly-manufactured HDD's.
Admittedly I am a tad bitter over the runaround and hoops I've had to jump through to get to this point, and I don't know if these factors are even relevant for HDD's of less than 2TB size but even so, I imagine the near future needs an improvement by WD in this area with their TV player series.....