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

July 25, 2017

Some old system are not supported on dynamic disks. Learn to convert dynamci disk to basic disk without data loss.

Question: A 500G USB flash disk which was made into dynamic disk in XP can be read by XP system, but it is "invalid" in Win7 and cannot be read. What’s the matter? Is there a solution to make it valid in Win7?
We can easily convert a basic disk to dynamic one on our Windows 2000, XP, 2003, 2008, Vista, Windows 7, Windows 8 ,or 2012 operating system, but it’s fairly difficult to convert a dynamic disk to basic. Why is that so? This is because 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.

About dynamic disk and 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.
Windows Operating System supports two types of disk storage: basic disk and dynamic disk. Basic disks use primary partitions, extended partitions and logical partitions to manage the data on the disks; while the conception of Dynamic disk was introduced by Microsoft since Windows 2000, and it is added into Disk Management Tool. Dynamic disk storage uses volume-oriented disks, with the advantages such as the ability to create volumes that span multiple disks. Therefore, 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 provides no service for such needs. However, users can depend on third party software, such as AOMEI Partition Assistant, to do it. With the help of AOMEI Partition Assistant, you could easily convert dynamic disk to basic disk without data loss, and similarly, we could also easily convert basic disk to dynamic one either by using Windows built-in Disk Management Snap-in or partition assistant.

To convert dynamic disk to basic

You have to download partition assistant before you start. There are several editions you can choose from. Though Standard edition and Lite edition is free of charge, they do not support converting dynamic disk to basic disk. Therefore, you need to pick from other editions. Here, we will take screenshots of profession edition, an edition which is the most widely used and most popular among paid editions.
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.Launch AOMEI Partition Assistant 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 referring to the steps above.
On the other hand, if you want to convert basic disk to dynamic one, you indeed can take advantage of partition assistant. Besides, you can also make use of Windows built-in Disk Management Snap-in.
Except converting dynamic disk to basic drive, partition assistant can also convert partition between primary type and logical type, convert system disk between MBR and GPT Styles, Convert Data Disk between MBR and GPT Styles and so on.