I've never seen anything like this and might be posting prematurely, as I haven't seen my friend's computer yet. He called me this morning wanting information. The following is from his description of what happened.
After a typical MS Windows 10 update installation, he received a message saying that drive D: -- his recovery drive -- was out of space and the update couldn't be installed.
I have long been under the impression that the recovery drive only contained a mirror image of the computer as it was at the date of purchase. I thought nothing could be added to it and it just stood, as is, until and if it was ever needed. At that point (after saving data and resetting the machine), THEN you installed all the updates, which go on C: or the root drive. Again, not on the recovery partition.
He says the update that failed is for a 40+ MB Synaptics driver. He checked his drive info and there are 2MB of space left on his recovery drive (somewhere around a 300 GB drive, according to what he read to me off his computer).
Can regular MS updates even add or make changes to a recovery partition, or did he possibly download something he shouldn't have?
Thanks in advance if you can at least answer the question in red and I'll try to write again, with better information if I get it. He doesn't want to impose due to the holidays, so I might not know any more until after the first of the year.