On a Windows Vista-based computer, you use Windows Explorer to copy a file to a Distributed File System (DFS) shared folder. However, even though there is sufficient free space in the shared folder, the file copy operation may fail. 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 use Windows Explorer to check the free space of the DFS shared folder, Windows Explorer displays an amount of space that is less than what is actually available on the file server.