I am currently running Windows 10 and have a 1tb hard drive. A few days ago I had 300gb of storage left of my hard drive, then the next day when I booted up my computer I had nothing left. I have been able to reclaim some storage due to deleting some programs, however I have no idea where that 300gb went, Please help. I have tried many things online such as looking at system restore points or running system clean-up, yet I have found no evidence of what has happened. I would be very grateful of any help.