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ERROR_JOIN_TO_JOIN
What ERROR_JOIN_TO_JOIN means
ERROR_JOIN_TO_JOIN is a Win32 system result whose documented message is: “The system tried to join a drive to a directory on a joined drive.” In practical troubleshooting, it belongs to invalid legacy mapping topology where a drive is being joined to a directory located on another joined drive.
Typical causes
- mapping scripts chain JOIN relationships
- a destination path was resolved through an existing JOIN unknowingly
- configuration was copied from a different drive layout
How to investigate the result
- expand both source and target to their underlying volumes
- draw the current JOIN topology and detect chains or cycles
- remove intermediate mappings in a controlled test
Developer guidance
Keep JOIN relationships flat. Resolve destinations to ordinary directories on non-joined drives before creating a mapping.
Administrator and support guidance
Simplify legacy mappings one at a time and preserve the original configuration for rollback. Modernize to volume mount points where practical.
Example
Drive D: is already joined elsewhere, and a script tries to JOIN E: to a directory reached through D:, resulting in this result.
How it differs from related results
This code rejects JOIN-to-JOIN chaining specifically; ERROR_IS_JOINED only says one drive already has a JOIN relation.
References
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