5

I was shopping for a couple of new memory cards for new cameras this year and noticed that there are some SD cards that are now UHS-1 compatible. I wasn't sure what that really meant so I went looking for more info, and found that UHS stands for Ultra-High Speed and brings newer, faster signaling to SD cards.

Reading the overview at Secure Digital Wikipedia page it isn't clear if the new speeds also come with a guarantee of backwards compatibility. It seems like UHS cards might be compatible if the reader/writer also accepts SDXC cards - because they were both defined in version 3.0 of the SD spec, though the signaling (voltage and actual bit transfer) is unique for UHS cards.

Anyone with hands-on experience or links to other articles/vendor pages that might shed light on the subject?

5

From Lexar's (one of bigger manufacturers of memory cards) FAQ located here:

Can I use an UHS-I card with a SDHC host device?

Yes! All SD UHS-I cards can be used with all existing SDXC and SDHC devices (backwards compatible). Note that SDXC UHS-I cards are not compatible with SD or SDHC host devices, only with SDXC host devices. See the SDXC FAQ for more information. Although SD UHS-I cards can be used with all existing SDXC and SDHC devices, if you want to optimize UHS performance, select a device with the UHS-I logo:

| improve this answer | |
  • Ah, so 32GB is the cutoff between SDHC and SDXC. A 32GB card will work in SDHC but not 64GB. – Chloe May 28 '16 at 6:02

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.