I have a 120GB (actually a bit less than 112GB) Kingston SSD as my primary disk.
I don't check it very much but as I am thinking to install a VM to play with W10 I decided to verify how much free space I had on it and got puzzled to find only 30GB (I thought I had more).
Then I right-clicked the C: unit to check properties and it said that I had 80GB used. Then I marked "Show hidden files" option at Explorer, selected everything at C: and checked Properties again and this time it said 60GB.
Where should the missing 20GB has ended?

I don't check it very much but as I am thinking to install a VM to play with W10 I decided to verify how much free space I had on it and got puzzled to find only 30GB (I thought I had more).
Then I right-clicked the C: unit to check properties and it said that I had 80GB used. Then I marked "Show hidden files" option at Explorer, selected everything at C: and checked Properties again and this time it said 60GB.
Where should the missing 20GB has ended?
My Computer
At a glance
Windows 7 Professional 64bitIntel i5-33308GBOnboard
- Computer type
- PC/Desktop
- Computer Manufacturer/Model Number
- Custom
- OS
- Windows 7 Professional 64bit
- CPU
- Intel i5-3330
- Motherboard
- GigaByte B75M-D3H
- Memory
- 8GB
- Graphics Card(s)
- Onboard
- Sound Card
- Behringer UCA222
- Monitor(s) Displays
- Samsung 22.5"
- Screen Resolution
- 1920x1080
- Hard Drives
- SSD Kingston 120GB
HDD Samsung 320GB
- Internet Speed
- 1M
- Antivirus
- ZoneAlarm FW + AV Free
- Browser
- Chrome