Free Tools To Check SD Card Speed And Capacity Online

Why Check SD Card Speed and Capacity?

Ensuring your SD card performs as advertised is crucial for optimal device performance and data integrity. Here are some free tools to help you verify the speed and capacity of your SD cards, along with detailed steps and tips to make the process seamless.

1. H2testw

Overview
H2testw is a reliable and widely used tool for testing the true capacity and read/write speed of SD cards. Developed by Harald Boegeholz, it is particularly useful for detecting counterfeit SD cards that may not meet their advertised specifications.

How to Use

• Download and Install: Download H2testw from a trusted source. The software is available in both 32-bit and 64-bit versions and supports Windows 11, 10, 8, and 7.
• Run the Test: Launch H2testw and select the SD card you want to test. The tool will write and read data to the card to determine its actual capacity and speed.
• Language: Although the website and initial interface may be in German, you can switch to English after the first run.
• Compatibility: H2testw works with various storage devices, including USB sticks, hard drives, and network drives.

2. FakeFlashTest

Overview
FakeFlashTest is another tool designed to quickly test the capacity and read/write speed of SD cards. It offers a "Quick Size Test" that speeds up the testing process, making it ideal for larger capacity cards.

How to Use

• Download and Install: Download FakeFlashTest from a trusted source.
• Run the Test: Launch FakeFlashTest and select the SD card. Choose the "Quick Size Test" option, which writes and reads 512 bytes of data at random sectors. Note that this test is destructive and will erase data on the card.
• Non-Destructive Test: If you prefer not to lose data, you can opt for a longer, non-destructive test.
• Backup Data: Always back up your data before running any tests.

3. EaseUS Partition Master

Overview
EaseUS Partition Master offers a "DiskMark" feature that allows you to test the speed of your SD card in detail. This tool provides comprehensive data on sequential and random read/write speeds, I/O, and delay times.

How to Use

• Download and Install: Download EaseUS Partition Master from the official website.
• Launch DiskMark: Open EaseUS Partition Master, navigate to the "Discovery" section, and activate the "DiskMark" feature.
• Configure Test: Select the target drive (your SD card), choose the test data and block size, and click "Start" to begin the test.
• Features: Besides speed testing, EaseUS Partition Master can format SD cards, repair bad sectors, and check SSD health.

4. AJA System Test

Overview
AJA System Test is a free tool that helps you check the speed of your SD card on both Windows and Mac. It provides detailed graphs to help you visualize the performance consistency of your SD card.

How to Use

• Download and Install: Download AJA System Test from the official website.
• Run the Test: Launch AJA System Test and select the SD card. Choose the file size to write to the card and start the test. The larger the file size, the longer the test will take.
• Interpret Results: Look for any major fluctuations in the speed graph. Minor fluctuations are normal, but significant variations may indicate issues with the card.

5. Speed Out

Overview
Speed Out is a simple, portable tool that tests SD card speeds by writing temporary files to the card. It is easy to use and does not require installation.

How to Use

• Download: Download Speed Out from a trusted source.
• Run the Test: Extract the files and run the executable. Select the SD card and start the test.
• Limitations: While Speed Out is quick and easy, it does not provide detailed data compared to other tools.

Additional Tips

Backing Up Data

Before running any tests, especially those that are destructive, make sure to back up all important data on your SD card to avoid data loss.

Using Command Prompt for Health Checks

For checking the health of your SD card, you can use the built-in chkdsk command in Windows. This command helps identify and repair file system errors.

Scanning for Viruses

If you suspect your SD card might be infected with malware, use Windows Defender to scan the card. Right-click the SD card in File Explorer, select "Scan with Microsoft Defender," and follow the prompts.

By using these free tools, you can ensure your SD cards are performing as expected and detect any potential issues early on. Always prioritize data safety and use these tools wisely to maintain the health and performance of your storage devices.