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1. Currently running operation system is in this partition.
2. Current partition is being opened by Windows Explore or My Computer.
3. There is some system tray program accessing the partition.
4. There are other programs accessing or residing in the partition.
All in all, if only there is some program accessing the partition, it will prompt that error.
Where tray program lies is in the area the time is showed on the right-underside of the desktop.