Solved: DiskPart Cannot Create Primary Partition on USB or SD Card

Have you ever suffered the problem that DiskPart cannot create primary partition on USB or SD card? If you have this problem, please read this tutorial carefully to know the reasons and how to solve it.


By Hedy / Updated on May 12, 2023

Share this: instagram reddit

DiskPart cannot create primary partition on USB or SD card

Nowadays, as the functional and portable data storage device, USB flash drive or SD card becomes more and more popular for people to store a number of important files and documents so that they can carry it everywhere and anytime. Portability is the most remarkable advantage of USB flash drive or SD card. As long as they connect it to the computer, they have the possibilities to get the data at any time.


However, USB drives and SD card usually have only one partition by default. As people store more and more files on it, they realize that it's hard to find the exact one they need someday. That's why many users want to create at least two partitions on it, which allows them to manage their different kinds of files, so that they can quickly find the locations of files next time.

When it comes to creating primary partition on USB flash drive or SD card, you probably ask diskpart.exe for help, but you may have encountered the problem that DiskPart cannot create primary partition on USB when you type the command as the tutorials online.  

Possible causes for DiskPart cannot create primary partition on USB

Why does diskpart cannot create primary partition on USB or SD card? It is caused by various factors not just because you input the wrong command. The next content will show you the most possible reasons and you will know what to do after reading.

✫Lose connection. As we all know, a USB drive or SD card should be continuously connected to your computer if you want them work normally. When USB becomes disconnected with the computer, DiskPart may fail to recognize and exert the command on it. So check the connection first.

✫Low Windows version. The previous Windows system has the restriction on the partition number of USB flash drive or other removable media like SD card. Hence, maybe you have created a primary partition on USB successfully, but you can’t see the new one on USB stick in File Explorer because the Windows can only recognize the first primary partition. To solve it, you can upgrade system to Windows 10 version 1703 or later versions.

How to create primary partition on USB or SD card?

Since we have known there are different reasons which can cause the error that DiskPart cannot create primary partition on USB or SD card, it's complicated to get rid of the factors one by one. In the following content, we will recommend you an easy way to create primary partition on USB or SD card no matter what circumstance you have met.

AOMEI Partition Assistant Professional is a powerful disk manager which not only allows you to create partitions on hard drives but also enables you to shrink volume as well as delete volume on the USB drive or SD card. In addition, it only needs several simple steps as follows:

Download DemoWin 11/10/8.1/8/7/XP
Secure Download
Note: Please make sure you Windows can recognize the second or later primary partition, otherwise you cannot see it in file explorer or store data on it even though you have created a second primary partition successfully.

Method 1: Quick partition

If you USB flash drive or SD card is empty without any partition on, "Quick partition" should be your first choice.

Step 1: Download the software and launch it. Click “Quick Partition” in the right menu.


Step 2: In the pop-out window, you can set partition number, label, size and disk type as you wish. Then click "Start Partitioning".


Method 2: Split partition

If you have had partitions on your USB flash drive or SD card and you want to create more on it, you can try "Split partition".

Step 1: Run AOMEI Partition Assistant Professional, right click the partition you want to split and then choose "Split partition".


Step 2: In the new window, you can modify the size of original and new partition. Then click "OK".


Step 3: Then you will back to the main console, and click "Apply" to commit the operation.


No matter which method you will choose, you can get new partitions now. If you are not sure whether they are primary or logical partitions, you can check in AOMEI software by the following steps:

♦ Right click the new partition.

♦ Click "Advanced".

♦ In the extended menu, if it shows "Convert to Primary Partition", it means the new partition is not a primary one, then you can click it to convert; "Convert to Logical partition" means it's primary partition; if the "Convert to Primary Partition" option is grayed out, the most possible reason is the disk is MBR and the number of primary partition has reached its limit.


Now, when the DiskPart cannot create primary partition on USB or SD card, you know why it may happen and learn several ways to solve it. Since AOMEI Partition Assistant Professional has powerful functions no matter what situations you are at, it's highly recommended to you. Additionally, you can enjoy its more helpful features to manage partitions conveniently and quickly. For example, it can copy recovery partition to USB, wipe USB flash drive, clone USB drive and so on.

Hedy · Staff Editor
Hedy is an editor of AOMEI Technology. She is very good at solving problems of partition management, and she wants to share all the problems she had already solved to users who met the same questions.