On a Windows Vista-based computer or on a Windows Server 2008-based computer, you copy a file to a Distributed File System (DFS) shared folder in Windows Explorer. However, even though the shared folder has sufficient disk space, the file copy operation may not be successful. Additionally, you may receive the following error message:
The selected files could not be copied. There is not enough free space on the device.
When you check the free space for the DFS shared folder in Windows Explorer, Windows Explorer displays an amount of space that is less than what is actually available on the file server.