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Fix 'The Specified Disk Is Not Convertible' Error in Windows

Updated by Tracy King on Jan 29, 2021
Written by Brithny

On this page, we'll show you the solutions to fix this issue, converting your disk to MBR or GPT successfully. You may also follow to learn the causes and how to avoid this issue from happening again.

Don't worry if Windows warns you 'the specified disk is not convertible' while converting a disk or initializing a disk to GPT/MBR. Follow to see how to get rid of this error from your disk now:

Note that if your disk is accessible now, please create a backup of your disk data first in case of file loss while fixing 'the specified disk is not convertible' error.

Fix 1: The Specified Disk Is Not Convertible Because The Size Is Less Than The Minimum Size Required

The specified disk is not convertible error image

Error Message Symptoms
"The specified disk is not convertible because the size is less than the minimum size required".
  1. 1. Disk can't initialize
  2. 2. Can't convert to GPT
  3. 3. Disk shows as 0GB & "Read-only"

Causes of This Error: 1. Partition exists on disk; 2. The disk contains unknown errors.

The specified disk is not convertible because the size is less than the minimum size required error usually occurs in disk management while initializing a disk to GPT. So how to fix this error and convert your disk successfully?

Fix "The Disk Is Not Convertible Because the Size Is Less" Error [3 Moves]

So how to get rid of this issue from your disk in Windows 10/8/7? Follow through the guides below, you'll make your disk convertible again:

#1. Check Disk State in Disk Management

Step 1. Connect or install the new disk to your computer.

Step 2. Press Windows + R keys, type diskmgmt.msc in the Run dialog, click "OK".

Step 3. Open Disk Management, check the state of your disk:

  • If it shows as 0GB or Read-only, clean the Read-only state in #2. 
  • If it shows as Unknown, Not Initialized, move to #3 and initialize the disk.

Disk layout that cannot be initialized in disk management

#2. Clean Read-Only in DiskPart

Step 1. Press Windows + R keys, type cmd in the Run box, click "OK" to open Command Prompt.

Step 2. Type diskpart and hit Enter to open DiskPart. 

Step 3. Type the following command lines one by one and hit enter each time:

  • list disk
  • select disk 0 (Replace 0 with the disk number of your read-only disk)
  • clean
  • exit

Note that this method would clean up the whole disk, and if you have files on it, you'll lose the dis data. To restore the lost data, you can turn to reliable data recovery software for help.

After this, you may now move to #3 to initialize your disk to GPT without any convertible issues.

#3. Initialize Disk to GPT or MBR

Here, we would like to suggest you try EaseUS partition manager software which allows you to initialize disk in only a few clicks:

Step 1. Open EaseUS Partition Master. Connect the hard drive or SSD to PC.

Right-click the target HDD or SSD and select "Initialize to MBR" or "Initialize to GPT" accordingly.

Fig 1. Initialize to MBR:

initialize to mbr

Fig 2. Initialize to GPT:

initialize to gpt

Step 2. A pending operation of initializing disk to MBR or GPT disk will be added. Execute the operation and click "Apply".

Initialize to GPT - 2

Wait for the process to complete. Now, you can then partition hard drive in Windows and make use of the disk space. 

Fix 2. The Specified Disk Is Not Convertible. CORMs and DVDs Are Examples of Disks That Are Not

CMD can't convert disk to MBR or GPT

Error Message Symptoms

"Virtual Disk Service error:
The specified disk is not convertible. CDROMs and DVDs are examples of disks that are not convertible".

  1. 1. Can't convert to GPT or MBR
  2. 3. Error message pops up in DiskPart CMD

Note that Windows can't convert CDs and DVDs to MBR or GPT. So if you attempt to convert CD or DVD, you can't fix this error. But if it's a hard drive disk, check out the causes and follow to fix it here.

Causes of This Error: 1. Partitions exist on the drive; 2. Windows built-in utility requires deleting all existing partitions for disk conversion.

It requires cleaning the whole disk to convert between MBR and GPT using DiskPart. Otherwise, Windows will not allow you to wipe the hard drive, which makes it even difficult to convert system disk to GPT or vice versa.

Fix "The Specified Disk Is Not Convertible" Error and Convert Disk to MBR/GPT

So how do you fix a specified disk is not convertible error without losing any partitions and data? Here, a reliable disk management tool  - EaseUS Partition Master can help.

Its disk conversation feature enables you to fully convert a disk from GPT to MBR or MBR to GPT without deleting partitions or losing any data.

Follow the steps here to convert your disk to MBR in only a few clicks now:

Step 1. Install and open EaseUS Partition Master on your Windows computer.

Step 2. Right-click the GPT disk that you want to convert and select "Convert to MBR". Then, you will add a pending operation.

convert GPT to MBR

Step 3. Click the "Execute Operation" button at the top-left corner. Next, click "Apply" and begin to convert GPT disk to MBR. All data is safe with EaseUS partition manager software.

convert GPT to MBR

When the conversion process completes, you are good to go and continue using the drive for saving your data again.

Tips to Protect Drive from "The Specified Disk Is Not Convertible" Error

Is there a way that can protect your drive and data from a "the specified disk is not convertible" issue? Yes. Here are some tips that you can try:

  1. 1. Create a hard drive data backup
  2. 2. Run antivirus software to clear virus or malware
  3. 3. Update disk driver timely
  4. 3. Choose the right disk conversion tool like EaseUS Partition Master for help.

It's Your Turn, Take Action to Protect Your Disk Safely

If you encountered the error message of 'the specified disk is not convertible' error while converting your hard drive disk, SSD, or even an external hard drive to MBR or GPT, don't worry.

Check the error message on your computer and follow the respective guide here and follow to fix the issue immediately. It's your turn now. Take action and you can convert your disk successfully. 

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Updated by Tracy King

Tracy joined in EaseUS in 2013 and has been working with EaseUS content team for over 7 years. Being enthusiastic in computing and technology, she writes tech how-to articles and share technical solutions about Windows & Mac data recovery, file/system backup and recovery, partition management and iOS/Android data recovery.

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Written by Brithny

Brithny is a technology enthusiast, aiming to make readers' tech life easy and enjoyable. She loves exploring new technologies and writing technical how-to tips. On her spare time, she loves sharing things about her favorite singer - Taylor Swift on her Facebook or Twitter.

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Product Reviews

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  • I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes. I also think the overall look and feel of EaseUS Partition Master Free makes whatever you're doing with your computer's partitions easy.

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  • Partition Master Free can Resize, Move, Merge, Migrate, and Copy disks or partitions; convert to local, change label, defragment, check and explore partition; and much more. A premium upgrade adds free tech support and the ability to resize dynamic volumes.

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  • It won't hot image your drives or align them, but since it's coupled with a partition manager, it allows you do perform many tasks at once, instead of just cloning drives. You can move partitions around, resize them, defragment, and more, along with the other tools you'd expect from a cloning tool.

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All-round disk & partition management software for personal and commercial use. Let it manage your storage drive: resize, format, delete, clone, convert, etc.

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