SD Card vs SDHC: Key Differences, Compatibility & Which to Buy
SD Card caps at 2 GB and uses the FAT12/16 file system; SDHC (Secure Digital High Capacity) spans 4–32 GB and runs on FAT32. The tiny logo—plain “SD” versus “SDHC”—is the only visual hint that two cards with identical dimensions are technically different generations.
People grab whichever card looks right in the shop, then panic when a 64 GB drone or dash-cam refuses to read their “new” 2 GB relic. The same slot swallows both, so the mix-up feels like a scam—until footage stops recording mid-road-trip and memories vanish.
Key Differences
Capacity ceiling: SD 2 GB vs SDHC 32 GB. File system: FAT16 vs FAT32. Speed class: SD tops at 25 MB/s; SDHC starts at Class 2 and climbs to UHS-I. Compatibility: SDHC slots accept SD, but SD readers choke on SDHC. Price: a 32 GB SDHC now costs less than an old 1 GB SD.
Which One Should You Choose?
Buy SD only for vintage cameras or old GPS units. For phones, drones, or handheld consoles, grab SDHC 32 GB Class 10—cheap, stable, and supported. Future-proof? Skip both and jump straight to SDXC 64 GB+ if your device can handle exFAT.
Can I reformat an SDHC card to work in an old SD-only reader?
No. The hardware controller in SD readers can’t address beyond 2 GB, regardless of formatting tricks.
Does SDHC speed matter for photos?
Yes. A Class 10 SDHC clears camera buffers faster, letting you shoot RAW bursts without stutter.
Is SDHC the same as microSDHC?
Exactly the same spec—just smaller. Use an adapter and your microSDHC becomes a full-size SDHC.