If you are using a version from 2019 or earlier, you are not using the new portable version. You are risking corrupted writes on modern high-capacity microSD cards.
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Once the "Write Successful" message appears, close the tool. Right-click the drive in Explorer and select "Eject" before physically removing the card. If you are using a version from 2019
: Frequently used in Android and ARM-based projects to deploy firmware and kernels. How to Use the New Portable Version win32diskimager portable new