Convert a directory to a qtree using a Windows client
To convert a directory to a qtree using a Windows client, you rename the directory, create a qtree on the storage system, and move the contents of the directory to the qtree.
You must use Windows Explorer for this procedure. You cannot use the Windows command-line interface or the DOS prompt environment.
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Open Windows Explorer.
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Click the folder representation of the directory you want to change.
The directory must reside at the root of its containing volume.
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From the File menu, select Rename to give this directory a different name.
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On the storage system, use the
volume qtree createcommand to create a new qtree with the original name of the directory. Learn more aboutvolume qtree createin the ONTAP command reference. - 
In Windows Explorer, open the renamed directory folder and select the files inside it.
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Drag these files into the folder representation of the new qtree.
The more subfolders contained in the folder that you are moving, the longer the move operation takes.
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From the File menu, select Delete to delete the renamed, now-empty directory folder.