Windows disk manager shows the partitions. You just can't do anything with them. Really dumb as it was a system disk, that appears to have had extra hidden system partitions added from upgrades such as windows 8 to 10. Now I just wanted to clean the disk entirely so I can use it as an image backup. But with all those hidden partitions, windows image thingy keeps getting very confused.
Yes I know I could image with something like Acronis, but this is a lappy I'm trying to clean out for someone else and I just want a simple solution so they could wipe and reset. As there is only now a small SSD in the lappy I didn't want lots of that filled with the original manufacturer's restore segments that ate a third of the SSD when I cloned the whole thing in Acronis.