Noticed something slightly odd last night. The old 1TB disk that I dropped in was still about 90% full of old recordings and this is indeed reflected in the disk icon on screen and in the webif.
However, the media list is only showing me the couple of recordings that I made last night - none of the pre-existing ones that were made on my original T2. Ergo I can't delete anything to create more space.
Not too worried about this disk as it's a temporary measure but a bit more concerned that my 2TB disk might display the same behaviour when I come to fit it.
Any ideas?