Micro SDHC vs. SDXC: Key Differences & Which Card You Need
Micro SDHC (Secure Digital High Capacity) tops out at 32 GB and uses the FAT32 file system. SDXC (Secure Digital eXtended Capacity) starts at 64 GB, runs exFAT, and can reach 2 TB—same physical size, different ceiling.
People buy the wrong card because the labels look identical in a checkout line. You grab a 256 GB “micro SD” assuming it’ll work in your 2017 drone, only to see “card error” on screen—your slot was born before SDXC firmware.
Key Differences
Capacity: SDHC 4 GB–32 GB, SDXC 64 GB–2 TB. File system: FAT32 vs exFAT. Speed classes overlap, but SDXC often ships with faster UHS-II lanes. Compatibility: older readers reject exFAT without a firmware update.
Which One Should You Choose?
Pick SDHC for dash cams, old phones, or budget action cams under 32 GB. Choose SDXC for 4K drones, Nintendo Switch, or phone storage beyond 64 GB—just confirm your device lists “SDXC support” in its specs first.
Can I reformat SDXC to FAT32 for an old camera?
Yes, but the camera may still refuse cards over 32 GB, so test before a big trip.
Will an SDXC slot read my old SDHC card?
Absolutely—backward compatibility is built in, so your 16 GB card will work fine.