After I managed to mount one of my windows partitions I worked with it for some time without any problems. After restart I can't access any more the partition, meaning the folder I mounted it on, still exists (obvious), but when I enter it, it is clean, meaning it has no data inside.
When I try to mount again my partition I get the following message: Mount is denied because the NTFS volume is already exclusively opened.
The volume may be already mounted, or another software may use it which
could be identified for example by the help of the 'fuser' command.
How to fix the problem?
Edits:
To mount my partition I used the command line:
sudo mkdir Hard
sudo mount /dev/sda5/ /media/alexandru/Hard/