My system has dual boot: windows xp and ubuntu. Accessing files and directories of windows xp from ubuntu is easy as well known. I deleted some files and directories in windows xp, let say in c:\foo.bar from ubuntu. When I boot to windows xp, I expected some more free disk space after some delete from ubuntu, but the free disk space is unchanged as nothing happened, but deleted files and directories from ubuntu have all gone. Where is this space?