0x00000087 – Error_Is_Substed – an Attempt Was Made to Use a JOIN or SUBST Command on a Drive That Has Already Been Substituted

The 0x00000087 – Error_Is_Substed means there's a problem when trying to use a JOIN or SUBST command on a drive that's already been changed.

This can happen if the commands are used wrongly or if two different programs are trying to use the same drive, which can make it hard to open files and might even cause some programs to crash.

To fix this error, users should check their drive settings using the Command Prompt and make sure no two processes are clashing. Keeping track of drive assignments can help avoid this issue and keep the computer running smoothly.

Error meaning:

An error means something went wrong.

It can happen when facts are wrong, calculations are off, or rules aren't followed.

Finding and fixing errors is important to keep things working well, especially in computers and machines.

Causes:

Potential reasons for the x00000087 error:

1. Using the JOIN or SUBST commands incorrectly.
2. Trying to reference a drive that is already in use.
3. Multiple users or processes trying to change the same drive at the same time.
4. Incorrect drive mappings in the system settings.
5. Conflicts with virtual drives.
6. Forgetting to check existing drive substitutions before running commands.

Symptoms:

Symptoms associated with the x00000087 error include:

1. Unable to access certain drives.
2. Error messages saying the drive has already been substituted.
3. Applications crashing or freezing unexpectedly.
4. Problems opening, saving, or transferring files.
5. Slower response times on the computer.
6. Difficulties running scripts or batch files that need drive access.

Solutions:

Step 1: Open the Command Prompt on your computer. You can do this by searching for "Command Prompt" in the Start menu.

Step 2: Type the command 'SUBST' and press Enter. This will show you a list of any drive substitutions that are currently set up on your system.

Step 3: Look for any drive substitutions that seem wrong or are not needed.

Step 4: If you find unnecessary substitutions, type 'SUBST [drive letter] /D' (replace [drive letter] with the letter of the drive you want to remove) and press Enter.

This will delete the incorrect substitution.

Step 5: Check if any programs or scripts are trying to use the substituted drives at the same time.

If they are, try closing them to avoid conflicts.

Step 6: Make sure all your software is up to date.

You can usually do this by going to the settings or help menu in each program and looking for an update option.

Step 7: If the error still happens, restart your computer.

This can help clear any temporary issues.

Step 8: Check again to see if the error is gone.

If it is not, you may need to seek further help.

Impact:

How the x00000087 Error Affects System Performance:

1. Application Failures: Programs may stop working or crash suddenly.
2. Data Access Issues: You might not be able to open or save files properly.
3. System Instability: The computer can become slow or freeze often.
4. Downtime: The system may be unavailable for work, wasting time.
5. Productivity Loss: Tasks take longer to complete, slowing down work.
6. User Confidence: People may start to doubt if the system is reliable.
7. Extra IT Work: Fixing these errors takes time away from other important tasks.

Relevance:

The x00000087 error is often seen in Windows operating systems, especially Windows 7, Windows 8, and Windows 10.

It happens when there is a problem with drive letters, which can affect how your computer works.

This error can come up if the JOIN or SUBST commands are used incorrectly.

Understanding this error helps both regular users and IT workers fix problems quickly and keep computers running smoothly.

Prevention:

To avoid encountering the x00000087 error in the future, follow these steps:

1. Don't Use JOIN or SUBST: Avoid using the JOIN or SUBST commands on drives that already have letters assigned.
2. Check Drive Mappings: Regularly check your drive mappings to ensure there are no conflicts.
3. Keep Records: Write down your drive assignments so you know which letters are used.
4. Be Cautious with Scripts: When using scripts or batch files, make sure they don't change drive letters unexpectedly.
5. Audit Drive Configurations: Perform regular checks of your drive settings to catch any problems early.

People Also Ask

What Operating Systems Are Affected by This Error?

The error can happen on many Microsoft Windows versions, including Windows 95, 98, XP, Vista, 7, 8, and 10. Problems can arise when using JOIN or SUBST commands with drives that are already substituted.

Can This Error Occur During Software Installation?

Yes, this error can happen when installing software if the program tries to use a drive that has been changed or is not working correctly. It's important to manage drives well to prevent these problems during installation.

Is There a Specific File Format Linked to This Error?

This error isn't tied to any file format. It happens because of problems with how drives are connected in the system. This can change how drives are used during different tasks, causing issues when trying to access them.

Will Antivirus Software Trigger This Error Message?

Antivirus software usually doesn't cause this error message. But sometimes, it can mess with drive commands or changes, which might lead to problems. Keeping the software up to date and setting it up correctly can help prevent these issues.

How Can I Report This Error to Microsoft?

To report an error to Microsoft, go to their Support website. Find the right section for your problem and fill out a form. Make sure to explain what happened and include details about your computer and what you did before the error happened.