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# How to Check if a Flash Drive’s Capacity Matches the Claimed Size
- URL: https://en.blog.themarfa.name/how-to-check-if-a-flash-drives-capacity-matches-the-claimed-size/
- Published: 2025-01-10T06:57:39.000Z
- Updated: 2025-01-10T06:57:39.000Z
- Description: When purchasing a no-name flash drive, there’s no guarantee that the capacity listed on the packaging will match the actual storage available on the device. It’s a good idea to verify this in advance.
- Author: Konstantin Dokuchaev
- Tags: Windows, ValiDrive

When purchasing a no-name flash drive, there’s no guarantee that the capacity listed on the packaging will match the actual storage available on the device. It’s a good idea to verify this in advance.

You can do this using the free utility [**ValiDrive**](https://www.grc.com/validrive.htm), which makes it easy to check the actual memory capacity.

### Steps to Check

1\. Launch the program.

2\. Reconnect the USB drive.

3\. Click the **Check USB Drive** button.

4\. Optionally, you can choose to display the output in monochrome mode.

![](https://storage.ghost.io/c/31/c7/31c7da9c-f519-464c-9a3b-2d4144b557a6/content/images/2025/01/------------2-1.png)

![](https://storage.ghost.io/c/31/c7/31c7da9c-f519-464c-9a3b-2d4144b557a6/content/images/2025/01/------------1.png)

![](https://storage.ghost.io/c/31/c7/31c7da9c-f519-464c-9a3b-2d4144b557a6/content/images/2025/01/------------3-1.png)

The program will then begin testing the sectors for write capability. As the test proceeds, each sector will be color-coded to indicate its status:

• Sector is available.

• Read error.

• Write error.

• Not writable.

![](https://storage.ghost.io/c/31/c7/31c7da9c-f519-464c-9a3b-2d4144b557a6/content/images/2025/01/------------5-1.png)

![](https://storage.ghost.io/c/31/c7/31c7da9c-f519-464c-9a3b-2d4144b557a6/content/images/2025/01/------------6-1.png)

At the end of the process, you’ll receive a clear summary report about the memory’s actual capacity. Additionally, **ValiDrive** will generate a detailed report containing data from all the tests.

You can download an example report below:

[ValiDriveValiDrive.rtf899 KBdownload-circle](https://en.blog.themarfa.name/content/files/2025/01/ValiDrive.rtf "Download")

[Try ValiDrive](https://www.grc.com/validrive.htm)