Can't save Campaign games on hard drive

I fired up the Campaign a few minutes ago to get an achievement and one of the challenges. When I finished, I went to save and quit but I got a message saying there was no room left on my storage device and it prompted me to select another device. I didn’t have another device ready, so I pressed no, the game went back to the main menu, and I had lost my progress. I know that there should be enough room on my hard drive (more than 10 GB). Has anyone else come across this issue, and what can be done to resolve the issue?

Edit: I was able to save games last week; I started experiencing the issue today.

You just click on the same hard-drive.

Hmm didn’t think to do that. I’ll try it tomorrow. Thanks!