Hi,
I just found out that some of space in one of my partition is occupied by NO file after I updated my Windows 8 to Windows 8.1 via MS Store. There is no file hidden in the partition but the computer shows me that 3GB of a partition in my second hard drive are being used.
What I did on my computer before I updated Windows 8 were:
1. Recovered my PC to the factory state
2....
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