How to Fix Image File Is Locked Daemon Tools Error


How to Fix Image File Is Locked Daemon Tools Error

If you are using Daemon Tools to mount image files such as ISO or MDF, you may encounter an error message saying “Unable to mount image. Unable to access image file.” or “Unable to mount image. Unit is locked.” This can be frustrating if you want to access the content of the image file or run a game or program from it. In this article, we will show you some possible solutions to fix this error and unlock your image file.

Method 1: Mount the MDS File Instead of the MDF File

Some image files come in two parts: a MDF file and a MDS file. The MDF file contains the actual data of the image, while the MDS file contains the metadata and information about the image. If you try to mount the MDF file directly, you may get an error message because Daemon Tools cannot read the information from the MDS file. To fix this, you need to mount the MDS file instead of the MDF file. The MDS file will automatically link to the MDF file and mount it correctly.

To mount the MDS file, follow these steps:

  1. Open Daemon Tools and click on the Add Image button.
  2. Browse to the folder where your image files are stored and select the MDS file. Click Open.
  3. The image file will appear in the Image Catalog. Right-click on it and select Mount.
  4. The image file will be mounted to a virtual drive. You can access it from My Computer or Explorer.

Method 2: Check the Permissions and Attributes of the Image File

Method 1: Mount the MDS File Instead of the MDF File

Another possible reason why you cannot mount or access your image file is that it has some permissions or attributes that prevent Daemon Tools from opening it. For example, if your image file is read-only, hidden, encrypted, or compressed, Daemon Tools may not be able to read it properly. To fix this, you need to check and change the permissions and attributes of your image file.

To do this, follow these steps:

  1. Right-click on your image file and select Properties.
  2. Go to the General tab and uncheck any boxes that say Read-only, Hidden, Encrypt contents to secure data, or Compress contents to save disk space. Click Apply.
  3. Go to the Security tab and click on Edit. Make sure that your user account or Everyone has Full control over the image file. If not, check the box next to Full control and click Apply.
  4. Click OK to close the Properties window.
  5. Try to mount your image file again with Daemon Tools.

Method 3: Create a New Image File from Your Original Disc

If none of the above methods work, it may be that your image file is corrupted or damaged somehow. This can happen if you downloaded it from an unreliable source, copied it incorrectly, or modified it with some software. In this case, you may need to create a new image file from your original disc using Daemon Tools or another software such as Alcohol 120% or PowerISO.

To create a new image file from your original disc, follow these steps:

  1. Insert your original disc into your optical drive.
  2. Open Daemon Tools and click on the Make Disc Image button.
  3. Select your optical drive as the source device and choose a destination folder for your new image file. You can also choose a format for your new image file such as ISO or MDF/MDS.
  4. Click Start and wait for the process to finish.
  5. You will have a new image file in your destination folder. You can mount it with Daemon Tools without any errors.


We hope this article has helped you fix the Image File Is Locked Daemon Tools error and unlock your image file. If you have any questions or suggestions, feel free to leave a comment below.


Leave a Reply

Your email address will not be published. Required fields are marked *


Proudly powered by WordPress   Premium Style Theme by