Why it happens
Realtek Card Reader driver missing or replaced by a generic driver after a Windows Update
SD card not inserted fully — the XPS 14 9440 uses a spring-loaded slot that requires a firm push until a click is heard
SD card reader disabled in BIOS after a firmware update as a security default
SD card formatted with an exFAT or NTFS file system that the reader cannot mount without the appropriate driver
How to fix
Reinstall the Realtek Card Reader driver — Go to Dell Support, find the XPS 14 9440, and download the Realtek Card Reader driver. Uninstall the existing card reader driver in Device Manager under Smart card readers or Memory technology devices, install the Dell driver, and restart.
Re-insert the SD card fully — Remove the SD card completely and reinsert it with firm pressure until you hear a click. The XPS 14 9440 uses a spring-eject mechanism that requires the card to seat fully for the reader to make electrical contact.
Enable the SD card reader in BIOS — Restart, press F2 to enter BIOS, go to System Configuration → Miscellaneous Devices and ensure SD Card Reader is enabled. Dell XPS BIOS updates occasionally reset this setting to disabled for security compliance.
Test with a different SD card — Try a known-working SD card to rule out a faulty or incompatible card. The XPS 14 9440 reader supports SD, SDHC, and SDXC up to UHS-I. Some UHS-II cards may not be recognized if the speed bus negotiation fails.
Check Device Manager for driver errors — Open Device Manager and look for any entries under Memory technology devices or Smart card readers with a yellow exclamation mark. Update or reinstall any flagged device, or scan for hardware changes via Action → Scan for hardware changes.
Ahmad, Penang: “The SD card reader on my XPS 14 9440 stopped working after a BIOS update. Checking the BIOS settings found that SD Card Reader had been reset to disabled. Enabling it fixed everything immediately.”
Frequently Asked Questions
What SD card speeds does the Dell XPS 14 9440 reader support?
The XPS 14 9440 SD card reader supports UHS-I speeds, which means maximum read speeds up to 104 MB/s. UHS-II cards will work but at UHS-I speeds only. For faster SD card access, use a Thunderbolt 4 docking station with a UHS-II card reader.
Does the Dell XPS 14 9440 have a full-size or microSD card slot?
The XPS 14 9440 has a full-size SD card slot. MicroSD cards require an adapter. The slot is spring-loaded on the right side of the chassis and supports standard SD cards flush with the laptop body for storage convenience.
Why does my SD card show up in Device Manager but not in File Explorer?
If the card reader appears in Device Manager without errors but the card is not visible in File Explorer, the SD card may not have an assigned drive letter. Open Disk Management (Win + X → Disk Management), find the SD card volume, and assign it a drive letter manually.
Can I use the XPS 14 9440 SD card reader for camera memory cards?
Yes. The XPS 14 9440 SD reader is compatible with standard SD, SDHC, and SDXC camera memory cards. Ensure the Realtek Card Reader driver is installed from Dell Support for reliable card detection and stable transfer speeds during photo imports.
Ryan holds a Computer Science degree and has over 20 years of hands-on experience with PC hardware, software, and driver troubleshooting. He is the author behind softwaredriverdownload.com, where he helps everyday users fix driver issues quickly and accurately. Ryan has personally tested most of the fixes on this site across a range of Windows 10 and Windows 11 machines.
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