ÀîêÍ wrote: > I googled this problem for many days and didn't find any way to solve > this problem. Maybe it is a bug. I hope someone can help me. Thank you. You may lose data doing this but at least for NFS volumes if something is stuck I umount the file systems with the "-l -f" options. I'm not sure if it'll work for NTFS but if you really want to force unmount try umount (path to mounted file system) -l -f You may want to check to see if any files are in use on that file system first, for that I'd use lsof lsof | grep (path to mounted file system) nate