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Fixing ERROR_SAME_DRIVE 143 (0x8F): Step-by-Step Guide

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Louis Ferguson

An editor at Blogzine


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Fixing ERROR_SAME_DRIVE 143 (0x8F): Step-by-Step Guide

The ERROR_SAME_DRIVE 143 (0x8F) error message indicates that “The system cannot join or substitute a drive to or for a directory on the same drive,” signaling that the system is unsuccessful in executing a drive substitution operation (using the SUBST command) or in mapping a drive to a directory on the same drive.

This particular error crops up when you attempt to assign a drive letter to a folder situated on the same drive as the intended drive letter. Windows prohibits this action due to potential conflicts with the file system of your device.

How can I resolve the ERROR_SAME_DRIVE 143 (0x8F)?

1. Opt for a different drive letter

When attempting to map a folder (for example, C:\MyFolder) to a drive letter (like F:), ensure that the chosen drive letter (F:) isn’t currently assigned to a different location on the same drive (C:). To verify your current substitutions, follow these steps:

  1. Hit the Windows key, type in cmd in the search field, and select “Run as administrator.”
  2. Input the following command to check existing drive substitutions, then press Enter: subst F: C:\MyFolder
  3. If F: is already linked to another path or a location on C:, you’ll encounter the ERROR_SAME_DRIVE message.

2. Relocate the directory

If you meet the ERROR_SAME_DRIVE message while trying to map a folder on the same drive, consider moving that folder to another drive. For instance, if there’s an available second drive, such as F:, transfer the folder from C:MyFolder to F:MyFolder.

  1. Press the Windows key, type cmd in the search field, and choose “Run as administrator.”
  2. Afterwards, if you attempt to create a virtual drive letter Z: pointing to the folder and press Enter, you will see the error: subst Z: C:\MyFolder
  3. To resolve this, move C:\MyFolder to a different drive. Use this command and hit Enter: move C:\MyFolder F:\
  4. Now, C:\MyFolder has been relocated to F:\MyFolder. To map the updated location, copy & paste the following command and hit Enter: subst Z: F:\MyFolder

3. Verify for typos & prevent circular references

Before proceeding, double-check the path and drive letter specified in the command to ensure there are no typographical errors, as these could result in additional issues.

Furthermore, be cautious of creating circular references, as they could lead to confusion and errors. Always inspect the folder’s contents you intend to map to ensure there are no references linked to the drive letter you’re using for substitution.

4. Utilize an existing drive letter

If you wish to create a substitution for a drive letter that’s already occupied, first delete the existing mapping.

For instance, if F: is in use and you want to release it, apply the command subset Z: /D, which will clear the mapping for Z: and allow you to reassign it as needed.

In summary, to prevent problems like ERROR_SAME_DRIVE, consider using an alternative drive letter, relocating directories to different drives, and checking for any circular references.

Additionally, we’ve published a new article regarding the Storage_Device_Abnormality_Detected issue, so check it out!

If you have any questions or comments concerning the ERROR_SAME_DRIVE problem, please share them in the comments section below.

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