How to Convert Dynamic Disk to Basic Disk without Losing Data?

November 7, 2018

It is necessary to learn how to convert dynamic disk to basic as some old system are not supported on dynamic disks. Read this paper and get detailed steps.


“I have a USB hard drive which was made into dynamic disk in XP can be read by XP system, but it is "invalid" in Win7 and cannot be read. I try to convert it back to basic disk in Windows 7 to solve this problem, but only find that the option of “Convert to Dynamic disk grayed out..? Is there a way to convert disk to basic? Thanks!”

Dynamic disk VS basic disk

Basic disk: A kind of physical disk which can be visited by MS-DOS (Microsoft Disk Operating System) and all Windows-based operating systems. It can contain up to 4 primary partitions or 3 primary partitions and 1 extended partition which contains several logical partitions.

Dynamic disk: It is also a kind of disk whose function is similar to that of the primary partition on basic disk. However, it can split or share data between or among disks. For example, a dynamic disk actually can consist of the storage space which is separated on two single disks. Besides, dynamic disk can copy data between or among disks in case of certain disk damage. This function needs more disks, but it is more reliable.

Dynamic to basic converter software is necessary

An increasing number of users want to use dynamic disk instead of basic one and they are design to convert their basic drives into dynamic ones. However, since some Windows operating systems (Windows 98/NT, MS-DOS and all Microsoft operating system Home editions, Vista Home Basic Edition, Windows 7 Home Basic Edition…) do not support dynamic disk, in some situations, you have to convert dynamic disk into basic.

Unfortunately, Windows disk manager doesn’t support converting a dynamic disk which contains volume(s) or partition(s) into basic disk, and it will only allow you to convert those disks which contain no volumes or partitions.

If you don’t want to delete the existing volumes on the dynamic disk, you can depend on third party software, such as AOMEI Partition Assistant Professional, to do it. With the help of AOMEI Partition Assistant Professional, you could easily convert a dynamic disk to a basic disk without data loss. Except converting dynamic to basic disk, AOMIE Partition Assistant can also convert partition between primary type and logical type, convert system/ data disk between MBR and GPT and so on.

Convert dynamic disk to basic via AOMEI Partition Assistant

(Take converting dynamic disk to basic disk in Windows 10 as an example)
Note: In case of data loss results from accidents due to wrong operation or other unexpected factors, you’d better have a backup of your data. To do this, AOMEI Backupper can help you.
Step1. Install and run AOMEI Partition Assistant Professional and click Dynamic Disk Converter in the Wizards column on the left.
Dynamic Disk Converter
Step2. In the new pop up window, click Next to continue.
Step3. As you can see from the following screenshot, there are two options:
  • Method 1: Convert a dynamic disk back to basic disk. Safely, directly and time-saving (only take 3-10 seconds) revert a dynamic disk back to basic disk without losing data.
  • Method 2: Convert any dynamic volume to basic partition. Sector by sector clone simplified volume, spanned volume, striped volume, mirrored volume and RAID-5 volume from dynamic to basic disk.


Since we are going to convert a dynamic disk to basic disk, we simply choose Method 1. (If you need to convert a dynamic volume to basic, then you can choose the Method 2.) Then, click Next to go on.      
Step4. Tick the dynamic disk which you want to convert and then click Next.
Note: You can tick to check if the selected disk contains mirrored volumes (RAID 1).
Step5.Confirm your operation and then click Proceed. Notice that you should tick “I have decided to execute this operation, click Proceed to start, the process only take 3-10 seconds” before clicking Proceed to show that you have confirmed the related information.
Step6. AOMEI Dynamic Disk Converter will notice you as soon as the operation has been completed. Click OK -> Finish to end this operation.
Note: To ensure the conversion take effect, it will restart the computer, so do not surprise by the sudden shutting down of your PC.
If your desktop or laptop cannot load Windows 10/8/7 successfully, you can install this software on another working computer. Then create a bootable media with a USB flash drive or CD.DVD to boot the other computer that fails to boot. To boot from AOMEI bootable media, you need to press a specific key (usually, Del for desktop, F2 for laptop) at computer startup to enter BIOS and change boot order. Then it will load the main interface of AOMEI Partition Assistant in which you can change dynamic disk to basic disk without losing data referring to the steps above.