Secure digital, or SD, cards are postage stamp-size memory cards used in computers, cameras, MP3 players and many other electronic devices to expand memory and share data. Secure digital high- capacity, or SDHC, cards are the same physical size as SD cards but are available with much higher memory capacity (4 GB and higher). Older PCs and laptops may not be able to read SDHC cards, but support can be added with a free Microsoft Windows download.
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Go to the Microsoft support website and select the appropriate driver for your Windows operating system (XP, Vista or Windows 7).
Click "Continue" under Validation Required, then click "Continue" under Run the Validation Tool. Click "Run" to run the validation tool. Write down the validation code after Windows is finished checking your system.
Return to the Microsoft support screen and enter your validation code. Click "Validate," then click "Download" in the next screen.
Click "Run" to install the SD card reader updates. Click "Continue" if Windows requests your permission. Click "Install."
Restart your computer when the installation is complete. Your card reader now supports SDHC cards.
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