By Cherry / Last Updated April 25, 2022

Can‘t convert basic disk to dynamic disk


“Hello everyone, I’m trying to convert my system volume from basic to dynamic to be able to do mirroring. When converting other volumes to dynamic, it completes with no problems at all. But when I’m trying to convert the system volume, nothing happens. Is Windows Disk Manage cannot convert system disk to dynamic disk?”


Why you are unable to convert to dynamic disk?

Many Windows users have faced the problem that cannot convert to dynamic disk with different error messages in Windows 11/10/8.1/8/7. 

1. The pack name is invalid

One of the error messages is “the pack name is invalid”. This problem occurs when you are using Windows Vista, Windows 7/8 in a country such as China, Japan, or Korea. Users all know that when you install Windows, it asks you to provide a name to your computer, and if you use one or more double-byte characters such as Chinese, Japanese, or Korean while giving name to your PC, you might get this error so that you can’t convert to dynamic disk successfully.

2. The operation is not supported by the object

A part of users may get an error message saying “The operation is not supported by the object” while converting basic disk to dynamic disk. Well, first, dynamic disk cannot work on Firmware, USB, or removable disk. A dynamic disk can span multiple drives. If a volume spanned a removable disk and the disk was removed from the system, then the volume would be broken. Second, basic disk can’t be converted into a dynamic disk if the basic disk exists on a laptop. third, "a basic disk can’t convert to dynamic disk" involves clustered servers. Besides, you can’t convert any hard disk with a sector size greater than 512 bytes.

3. Not enough space

You may want to convert a disk from basic to dynamic disk to mirror two volumes on another disk of equal size. However, when you try to convert it into a dynamic disk, you may get an error saying “there is not enough space available on the disk(s) to complete this operation”. For this problem, you need to know that you must have at least 1MB of unallocated space at the end of the MBR disk that you want to convert to create the database for the dynamic disk. This space is automatically reserved when the partition or volume is created in Microsoft Windows 2000 or Windows XP Professional. However, it may not be available on partitions or volumes that are created in other operating systems. This may be the cause for can’t convert to dynamic disk not enough space problem.

4. The disk could not be converted to dynamic because security is enabled

Many users have met the error with the message “The disk could not be converted to dynamic because security is enabled on one or more partitions” when attempting to convert basic disk to dynamic disk via both Disk Management and Diskpart. For this error, you need to know that you cannot enable dynamic disk on any disk with system partitions on it. Also, enabling dynamic disk will delete all partitions on the disk as well.

5. Convert to Dynamic Disk option greyed out

There is another situation that when you try to convert the basic disk to dynamic disk with Windows Disk Management, you may find that the Convert to Dynamic Disk greyed out like the following screenshot.

Convert to dynamic greyed out

Sometimes, the another option Convert to GPT Disk option greyed out too. We all know that in Disk Management, if a disk is initialized as MBR, then there is an option to convert the disk to GPT; on the contrary, if the disk is initialized as GPT partition style, then you can convert it to MBR. Thus, the 3TB hard drive is an MBR disk. And the GPT/MBR has a closed relationship with dynamic disk. For MBR disk, the maximum storage space it can recognize is 2TB, storage space that exceeds 2TB will be shown as unallocated space. Thus, when you convert a large hard drive to dynamic disk, the allocated space will keep Disk Management from doing the conversion.

How to convert to dynamic disk without losing data

Different causes have different ways to solve. And here we will provide you with some practical ways to solve your problems.

Method 1. Change your computer name

If you get the error message “The pack name is invalid” when you convert basic disk to dynamic disk, you can fix it by changing the name of your computer with English characters. And that would be helpful.

1>. Open Run dialog box by pressing Win + R keys, type "sysdm.cpl" and press Enter.

2>. It will open the System Properties window. Click on Change button.

3>. In the next screenshot, type a new name for your computer and make sure it doesn’t contain any double-byte characters.

Change Computer Name

After the changes, restart your computer and now you’ll be able to convert a basic disk into dynamic disk without any problem.

Method 2. Upgrade MB driver

If you get the error message saying “Operation not supported on this object”, while it is not a removable drive, you can try to upgrade MB drivers to Windows 64bit drivers. And after upgrade, you are able to convert to dynamic disk successfully.

Method 3. To change a basic disk into a dynamic disk using command line

Using command line to convert to dynamic disk may work. 

1>. Run cmd as admin to open the command prompt.

2>. Type diskpart to open diskpart command prompt.

3>. Then run the following commands to convert disk to dynamic.

▪ list disk
▪ select disk n
▪ convert dynamic disk 

Note: "n" refers to the number of the disk that you want to convert to dynamic.

Convert to Dynamic CMD


Method 4. To use storage space and create a mirror

If you have met the problem cannot convert to dynamic disk because security is enabled, you can try to use storage space and create mirror (*this would not help you convert basic disk to dynamic disk, but can help you to create mirror). You can access the control for Storage Spaces in Server Manager under the files and sharing section, then look at storage pools. From here you can add disks that do not have any partitions, or (new in 2016) any empty partitions on existing disks. Once you've added your physical disks to a pool, you can create virtual disks in mirror mode to have an effective raid 1. Note that using server manager is very basic, but easily gets the job done for some setups. Storage spaces have a lot of cool options and features that are only accessible via PowerShell.

Method 5. Convert basic MBR disk to GPT

If you have met a similar situation as we mentioned in point 5 before. then, you need to convert the hard drive to GPT at first, and then, convert it to dynamic disk. 

1>. You’ll need third-party software to assist you in converting MBR to GPT, and AOMEI Partition Assistant Professional is a great tool that can convert MBR to GPT without losing data. If you want to use Windows 11, you must convert MBR to GPT.
2>. In case of some unexpected accident happened, you should backup hard drive before doing.

✍ You can download the demo version of AOMEI Partition Assistant Professional to stimulate the operation. 

Download Demo Win 11/10/8.1/8/7/XP
Secure Download

Step 1. Install AOMEI Partition Assistant to your Windows 11/10/8/7 and launch it. Right-click the hard drive you need to convert to GPT partition style, select Convert to GPT Disk.

Convert Data Disk to GPT

Step 2. It will pop up a window where you can confirm the information, click OK.

OK to GPT Data Disk

Step 3. click Apply to submit the whole progress.

Apply to GPT Data Disk

After converting the hard drive to GPT partition style, you can back to Windows Disk Management and convert basic disk to dynamic disk successfully.


If you are working with Windows Server 2003, 2008, 2012, 2016, 2019, 2022, you can use AOMEI Partition Assistant Server to convert basic MBR disk to GPT.
 Converting a basic disk into a dynamic disk is a semi-permanent operation. Once you convert a basic disk into dynamic disk, you can not convert it back into basic disk unless you delete every volume on the entire disk, unless you use AOMEI Dynamic Disk Converter, which can help you convert dynamic disk to basic disk without losing data.