By Michael / Last Updated March 16, 2022


If you have ever noticed the problem about how to restore USB drive back to full capacity, you may be not surprised that your SD card shows wrong capacity. Let’s say that, you bought a 4GB USB days ago without much use so far, but to find it show as a drive with only 1GB capacity left when you plug it in your PC and try to do something. Why should this problem occur? And how to deal with it?

This problem may be caused by various problems, for example, some readers or host devices are not compatible with the larger SDHC and SDXC card which leads to re-partition the SD card to a size that is supported, besides invisible shadow files, formatting overhead, and hidden recovery partition can also make SD card not showing full capacity. If you experience the problem, please don’t worry! Here is a solution, you can use a third-party SD card format tool to restore SD card to full capacity, and we recommend you free AOMEI Partition Assistant.

Restore SD card to full capacity via AOMEI Partition Assistant

AOMEI Partition Assistant is a professional and convenient SD card format tool, which supports all Windows edition including Windows XP/Vista/7/8/10, both 32bit and 64bit. Next, we’ll show you how to restore SD card to full capacity with it in simple three steps. Please download it first and plug your SD card in your computer.

Step1: Launch AOMEI Partition Assistant. Right click your SD card partition and select “Format Partition”. (Format will delete all data on partition, please backup before the operation.)

Format Partition

Step2: Choose a file system and click “OK” to proceed.

Choose File System

Step3: Now you can restore SD card to original size. Choose “Resize Partition” to extend the reformatted partition to full disk space.

Just three simple steps with AOMEI Partition Assistant, you can restore SD card to full capacity. And don’t forget to click “Apply” in the end so to commit the operation. Except to restore SD card to original capacity, it also helps to use SD card as internal storage Android and so on.