I have unknown readers

'Computer' and 'Windows Explorer' r show drive (C :) and two optical drives.  They also show:

(F) reserved Système "this folder is empty".

However, 'Properties' show: space - 28.1 MB, free space - 71.8 MB, used capacity - 99.9 MB

(I) Windows 8 "this folder is empty".

However, 'Properties' show: used space - 11. 7 MB, free space 31.8 MB, ability - 31.8 MB

I don't understand this.  Can someone there explain to me?

Windows 7 Home Premium, 64-bit

There are hidden files that are used to manage the hard disk space, and that's probably what you see.  If you want all the details, you can download Treesize to http://www.download.com and it will show you everything you want to know and then some.  :-)

Good luck.

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