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3 Ways to Fix Convert to Dynamic Disk Greyed Out

Gemma updated on Oct 12, 2020 Partition Master | How-to Articles

"Hi, we are trying to extend a basic volume (size is 3TB) to dynamic, and the option is greyed out. Could someone help please to resolve this issue quickly? Thanks."

Convert to Dynamic Disk Greyed Out

A user asked a question that when he wants to extend a 3TB basic volume to dynamic disk in a Microsoft forum, he finds out the convert option is greyed out. He wants to know how to fix this "convert to dynamic disk greyed out" issue. In this article, we will tell you why this problem arises and how to solve it.

What Causes Convert to Dynamic Disk Greyed Out
How to Fix Convert to Dynamic Disk Greyed Out (3 Fixes)

What Causes Convert to Dynamic Disk Greyed Out

According to the user's question, the problem appears when he wants to extend a basic volume in which the size is beyond 2TB. And this is the reason why he can't convert the basic disk to dynamic disk. For MBR disk, its partition system is limited to 2TB storage space. Thus, if you switch a disk over 2TB to dynamic disk, the allocated space won't allow Disk Management to perform the conversion.

How to Fix Convert to Dynamic Disk Greyed Out

Since the problem is mainly about the capacity of MBR disk, you can solve it by converting the disk from MBR to GPT. Because a GPT disk does not have limitations that MBR suffers from. It can hold a nearly unlimited number of partitions. And the disk capacity size is no longer limited to 2TB. You have three choices to convert a disk: a partition management tool - EaseUS Partition Master, the Disk Management on the computer, and the DiskPart Command Prompt.

1. Convert Disk from MBR to GPT without Data Loss

All the conventional converting methods will cause data loss. Even if you have made full backups of all your volumes, restoring the backups need quite a long time. As a result, we recommend you to choose EaseUS Partition Master.

EaseUS Partition Master enables you to convert a disk from MBR to GPT or GPT to MBR without deletion or data erase. So you don't need to wait a long time to conduct the backup and restore process. Besides, you can also apply this tool to resize partition on Windows, format a partition, or merge partitions into a larger one.

Download EaseUS Partition Master now, and follow the guide below to explore a safe and sound conversion.

Step 1. Download and launch EaseUS Partition Master on your Windows computer.

Step 2. Right-click the MBR disk that you want to convert and choose "Convert to GPT".

convert MBR to GPT - 1

Step 3. After that, find and click the "Execute 1 Operation" button on the toolbar and choose "Apply" to start the conversion. You need to restart your device to enable this change.

convert MBR to GPT - 2

2. Convert Disk from MBR to GPT with Disk Management

In Disk Management, you can convert the disk type, delete a volume, and extend and shrink a volume, etc. Please follow the steps below to see how to convert the disk from MBR to GPT. This method involves a volume deletion. Please make sure you have made a full backup.

Step 1. Go to Control Panel, head to Administrative Tool, and choose "Computer Management".

Computer Management

Step 2. Click "Disk Management", you can see all your disk volumes here. Right-click one volume and choose "Delete Volume". Repeat the process to delete all the volumes.

Delete Volume

Step 3. Now right-click the MBR disk and choose "Convert to GPT Disk".

Convert to GPT Disk

3. Convert MBR Disk to GPT with DiskPart Command Prompt

You can also convert the disk to GPT with the command prompt. But this method will also require you to delete the volume. Please remember to make a backup.

Step 1. Run as an administrator, press Win, and select "Command Prompt".

Step 2. Type the command diskpart, then type list disk and press Enter.

Step 3. If disk 1 is the MBR disk, type select disk 1. Once selected the MBR disk, type clean to remove all the data on this disk.

Step 4. Now type convert GPT and press Enter to proceed.

Convert to GPT Disk with Command Prompt

The Bottom Line

In a word, convert to dynamic greyed out issue happens because of the MBR disk system limitation. The next time you encounter the same problem, check the MBR disk's size first and pick one method you prefer to solve your problem. Anyway, the EaseUS Partition Master is our recommendation, for it saves users data, and is easy to use.

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