fox river wrote:1) Used space on disk C.
I don't know why, I got different result if I check the space used on this drive, by right click on C (will show the pie chart) and by go into drive C, CTRL-A and then properties. The difference is about 15 GB !!!
Note : I have already set the explorer to view hidden files.
Most likely this is partially due to the clustering of your file system. If you have clusters of 4kB (common standard value on NTFS), and you store a file with a size of 3kB, it will use an entire cluster, and therefore block 4kB of memory. No other file can be written to that cluster, even if it has a size of only 0.5kB. This file will block another cluster of 4kB. A 5kB file will block two clusters. If you have a look at the properties of the three files, you will see that they have a cumulated file size of 8.5kB, but due to the clustering they will block 16kB.
The more small files you have, the higher will be the difference between cumulated file size and file system usage.
fox river wrote:2) I found a "Recovery Partition" on my disk. It's about 10 GB.
Should I remove it (since I've created two recovery DVDs) ? and how to remove it (I couldn't do it with Disk Management) ?
As far as I remember, the system you have installed will still work even if you remove the recovery partition. But the recovery won't work anymore because the MBR has been changed. But I can't tell this for sure.