ERROR_IS_JOIN_TARGET 0x80070085

Error code 133 · HRESULT 0x80070085

WINDOWS

A JOIN or SUBST command cannot be used for a drive that contains previously joined drives.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

ERROR_IS_JOIN_TARGET is a Windows error code (system error 133, returned as HRESULT 0x80070085) reported by Windows. Its official message is: “A JOIN or SUBST command cannot be used for a drive that contains previously joined drives.”

How to fix ERROR_IS_JOIN_TARGET

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

ERROR_IS_JOIN_PATHERROR_IS_JOINEDERROR_IS_SUBSTEDERROR_IS_SUBST_PATHERROR_PROC_NOT_FOUNDERROR_SEEK_ON_DEVICEERROR_NEGATIVE_SEEK

Source: Microsoft WinError.h

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