ERROR_IS_JOIN_TARGET - 133 (0x85)

Technical Background

The ERROR_IS_JOIN_TARGET error, with the numeric code 133 and hex code 0x85, is a specific file system-related error that occurs when attempting to use the JOIN or SUBST command on a drive that already contains previously joined drives. This error indicates an attempt to perform an operation that is not supported by the current state of the file system.

Error Details

The JOIN and SUBST commands in Windows are used for mapping network locations or creating virtual drives, respectively. When these commands are issued, they create junctions or mount points within the file system hierarchy. If a drive that already contains such junctions is targeted by another JOIN or SUBST command, this error is generated.

Common Causes

• Invalid Parameter Values: The attempt to use JOIN or SUBST on a drive that has existing joined drives.
• Incorrect Object Type: The operation was performed on an object type other than a drive, which is not supported by these commands.

Real-World Context

This error typically occurs in scenarios where administrators are managing network drives or virtual drives. For example, if a user attempts to join a network location to a drive letter that already has existing junctions, this error will be returned.

Is This Error Critical?

The ERROR_IS_JOIN_TARGET is not critical from a system stability perspective but can disrupt intended operations. It indicates an attempt to perform an unsupported operation and should be handled by the application or script performing the command.

How to Diagnose

To diagnose this error, follow these steps:

1. Review Operation Context: Ensure that the drive letter or network location being targeted is not already in use as a junction point.
2. Validate Parameters: Confirm that the correct parameters are provided for the JOIN or SUBST command. Incorrect parameter values can lead to this error.
3. Confirm Object Types: Verify that the operation is being performed on a valid drive object and not an unsupported file system entity.

How to Resolve

To resolve this issue, consider the following steps:

1. Correct Parameter Usage: Ensure that the correct parameters are used for the JOIN or SUBST command. Incorrect parameter values can lead to this error.
2. Adjust Operation Context: If a drive already contains junctions, use a different drive letter or network location for the operation.
3. Restore Data: In cases where data corruption is suspected, restore from backups if available.
4. Retry Operation with Valid Inputs: Attempt the command again with valid inputs to ensure that the error was due to temporary conditions.

Developer Notes

Developers should handle this error by providing appropriate feedback to users and ensuring that operations are performed in a context where they are supported. This can be achieved through validation logic before executing JOIN or SUBST commands.

Related Errors

• ERROR_ALREADY_ASSIGNED (0x82): Occurs when an attempt is made to assign a drive letter to a resource that already has one.
• ERROR_PATH_NOT_FOUND (0x3): Indicates that the path specified in the command does not exist.

FAQ

Q: What causes the ERROR_IS_JOIN_TARGET error?

A: The error occurs when attempting to use JOIN or SUBST on a drive that already contains existing junctions.

Q: How can I prevent this error from occurring?

A: Ensure that the target drive does not contain existing junction points before performing JOIN or SUBST operations.

Summary

The ERROR_IS_JOIN_TARGET is a specific file system error indicating an attempt to perform an unsupported operation. It is important for developers and administrators to handle this error appropriately by validating parameters, ensuring correct object types, and providing user feedback. This error does not pose a critical risk to the stability of the system but can disrupt intended operations.