The JMicron PCIe SDMMC Host Controller is a device driver used for enabling communication between the operating system (such as Windows) and a JMicron-based SD (Secure Digital) card reader or MMC (MultiMediaCard) reader that is connected via PCI Express (PCIe). This controller allows the system to recognize and interact with SD or MMC cards, such as those used in digital cameras, smartphones, or other devices.

What is the JMicron PCIe SDMMC Host Controller Driver?

• JMicron is a company that manufactures controller chips for various peripheral devices, including storage devices like SD card readers.
• The PCIe SDMMC Host Controller refers to the hardware interface (via PCIe) that allows your computer to interact with SD or MMC storage media.
• The driver is software that facilitates this communication between the device (SD/MMC card reader) and the operating system.

How to Install the JMicron PCIe SDMMC Host Controller Driver on Windows

Method 1: Install via Windows Update (Automatic)

Windows usually tries to automatically install drivers for connected devices, including SD card readers.

1. Connect the SD/MMC reader to your computer if it’s not already connected.
2. Open Device Manager (press Win + X and select Device Manager).
3. Look for any device listed under "Other devices" or "Storage controllers" with a yellow exclamation mark indicating missing drivers.
4. Right-click on the device and select Update driver.
5. Choose Search automatically for updated driver software. Windows will search the web (including Windows Update) for the appropriate driver.
6. Follow the prompts to install the driver if found.

Method 2: Manually Install the Driver

If Windows Update does not find the correct driver, you can manually download and install the JMicron driver from the official JMicron website or from your motherboard's support page (if your system has an integrated SD/MMC reader).

1. Download the driver:

   • Go to the JMicron website: https://www.jmicrontech.com/
   • Find the driver for your specific card reader model or check your motherboard manufacturer's website for the latest drivers for your system.

2. Install the driver:

   • Once the driver is downloaded, open the Device Manager (press Win + X > Device Manager).
   • Find your JMicron PCIe SDMMC Host Controller under Storage Controllers or Other Devices.
   • Right-click and select Update Driver.
   • Choose Browse my computer for driver software.
   • Select the folder where you downloaded the driver and proceed with the installation.

3. Restart your computer if necessary.

Method 3: Use Driver Update Software

If you're unsure about which driver to download, you can use third-party driver update tools, such as:

• Driver Booster
• Driver Easy
• Snappy Driver Installer

These tools scan your system for outdated or missing drivers and attempt to update them automatically.

Troubleshooting

• If the SD card reader is still not working after installing the driver, try the following:
  • Uninstall the driver from Device Manager and reinstall it.
  • Test the SD/MMC card reader on another computer to rule out hardware failure.
  • Make sure your motherboard’s chipset drivers are up to date, as they could impact how the PCIe devices work.
  • If you’re using an external SD card reader, ensure it is functioning properly on other systems as well.

Conclusion

The JMicron PCIe SDMMC Host Controller driver is essential for allowing Windows to recognize and communicate with SD/MMC card readers. By either relying on automatic Windows updates or manually downloading the driver, you should be able to restore functionality to your SD/MMC reader.