Wrong free size after extending volume in Windows 2008 R2

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http://serverfault.com – I extended volume and now Explorer and Disk management shows correct size of volume, but did not add extended space as a free space. Basically, I had 100Gb disk and had 30Gb free space, now I have 200Gb disk and still 30Gb of free space (numbers are same in Disk Management, Explorer and chkdsk.exe). Thanks for any help. (HowTos)