SD UHS-I FAQs

What is UHS?

UHS stands for “Ultra High Speed” and refers to the new technology that enables higher bus interface speeds on Secure Digital High Capacity (SDHC) and Secure Digital Extended Capacity (SDXC) cards. UHS-I defines interface speeds up to 104MB/sec. A SDHC or SDXC card that supports “UHS” could have performance up to 104MB/sec.

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What is the U1 Speed Class?

Some of the new UHS memory cards may have a U1 marking, which refers to the U1 Speed Class designed for UHS-I card. The U1 Speed Class designates a minimum capture (write) performance of 10Mbytes per second for recording streaming video content. Note that although U1 is the same speed as Speed Class 10, they are tested differently, and meeting one does not imply that the other is met by the card.

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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:

The chart below is a listing of SD host devices and memory cards that UHS-I cards support.

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What host devices in the market support SD UHS-I?

Fujifilm X-S1

Fuji FinePix F600EXR

Fuji Finepix Z900EXR

FinePix F550

FinePix HS20

FinePix X 100

FinePix F665XR

FinePix F775XR

FinePix HS30EXR

FinePix Z1010EXR

Olympus PEN E-P3

Olympus PEN E-PL3

Olympus PEN mini E-PM1

Olympus PEN X10

Sony SLT-A65V

Sony SLT-A77V

Sony α77

Nikon 1 J1

Nikon D7000

Nikon D5100

Nikon P500

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What is the benefit of using a Lexar® UHS-I SD card?

Lexar Professional memory cards accelerate the digital photography workflow. The Lexar Professional UHS-I cards deliver professional level, high speed performance and reliability, with minimum guaranteed speeds. Capture and store high-quality images and 1080p HD video, and transfer files faster to maximize workflow. Lexar UHS-I cards include Image Rescue® 4 software and come with a limited lifetime warranty. With Lexar UHS-I cards you can count on high-speed performance to maximize your digital photography workflow.

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