Micro SDHC vs. Micro SDXC: Key Differences, Speed & Compatibility Guide
Micro SDHC (High Capacity) cards top out at 32 GB and use the FAT32 file system, while Micro SDXC (eXtended Capacity) start at 64 GB, switch to exFAT, and can reach 2 TB.
You’re at the checkout, staring at two 128 GB cards: one labeled SDHC, one SDXC. The packaging looks identical, the price gap is tiny, and the clerk shrugs—so you grab the first one and hope your phone accepts it later.
Key Differences
SDHC ends at 32 GB, FAT32, max 25 MB/s. SDXC begins at 64 GB, exFAT, and supports UHS-I/II/III for 104–312 MB/s. Device firmware must explicitly support SDXC to read exFAT.
Which One Should You Choose?
Pick SDHC for dash cams, old phones, and Nintendo 3DS. Choose SDXC for 4K drones, Switch OLED, or if your Android accepts adoptable storage and you crave 1 TB of offline Netflix.
Will a 64 GB SDXC work in my 2015 camera?
Only if the firmware update adds exFAT support; otherwise it will prompt “Card Error.”
Can I reformat SDXC to FAT32?
Yes, but files over 4 GB will split or fail, defeating the point of high-capacity recording.