By Ailsa / Last Updated May 15, 2020

SD Card Not Showing Full Capacity Problem

A user wrote his problem on the forum for help: I have a 64GB Samsung SD card and it’s not showing full capacity, so I determined to format the SD card. However, the 64GB Samsung SD card only shows 29GB not 64GB after formatting, it seems that the format operation cuts off some space on it. I have some files on it. Any ideas to restore Samsung SD card size? Thanks.

Or you may see the problem related to SD card showing wrong size issue like that: I have a 32GB SD card not showing full capacity in my Windows 7 computer, I can’t format it to the correct size with Windows format tool. How can I figure it out? Any help would be appreciated.

Why SD Card Memory Card Reduced?

There are some reasons should take responsible for the SD card not showing all space problem, like virus attack, non genuine memory card, or other factors. You’d better to remove virus using antivirus software, or purchase a SD card through official channels in case your rights are violated. On the other hand, formatting your SD card with an improper format tool also leads to the result that SD card size is wrong.

If your SD card lost capacity due to other reasons, you’d better format your SD card or memory card with powerful ways.

How to Restore SD Card to Full Capacity?

How to format an SD card when it is showing less space? There are two ways to format SD card to solve this problem: one is DiskPart command, the other is powerful and free SD card format software.

Format SD Card with DiskPart Command

Press WIN+R key combination.

Enter the following commands in turn.


List disk

Select disk m, where m is the SD card number.

Select partition 1

Delete partition



Create partition primary


Wait for a moment, SD card will be formatted successfully.

Format SD Card with Micro SD Card Format Tool

AOMEI Partition Assistant will do you a big favor, which is a free and powerful SD card format software. It’s a piece of cake for Partition Assistant to format SD card to restore SD card capacity. Here is how it works.

1. Download AOMEI Partition Assistant Standard, install and run the program. Insert your SD card into your computer via SD card reader.

2. Select Format Partitionon SD card partition. Please backup data in advance.

Format Partition

3. Choose a File System for you SD card, hitOK.

File System

4. Press Apply at the upper left corner to format your SD card.

5. Pitch on your SD card partition and select Resize partition.

Resize Partition

6. Drag the double arrow rightwards to increase SD card partition to its original size.

Resize Partition Size

7. Click Apply.


A few seconds later, the SD card not showing full capacity issue will be fixed. You will enjoy the job now. Besides, you can create a second partition on SD card, create a bootable USB drive, and more. Furthermore, AOMEI Partition Assistant offers a professional edition, which permits you to allocate free space from one to the other, convert primary partition to logical, convert system disk between MBR and GPT, etc.