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SD vs. UHS-II: the key difference
| Term | What it describes | What it does not tell you |
|---|---|---|
| SD | The Secure Digital card family and form factor | Bus generation, capacity category, or sustained write speed |
| UHS-II | A bus interface, identified by an additional row of contacts | Storage capacity or a guaranteed real-world read/write speed |
| SDHC / SDXC | Capacity categories within the SD family | Which bus interface the card supports |
| U1 / U3 / V60 / V90 | Speed-class markings for minimum sequential performance under defined conditions | Whether the card uses UHS-II |
The SD Association lists UHS-I at up to 104 MB/s and UHS-II at up to 156 MB/s full duplex or 312 MB/s half duplex. These are bus-interface maxima, not guaranteed card transfer speeds. Actual performance depends on the card and operating conditions. See the Association’s bus-speed guidance.
What do UHS-II speed figures mean in practice?
UHS-II’s additional contacts support its higher-speed signaling. The interface’s maximum rate is not the same as a card’s measured read or write speed: the SD Association notes that maximum speed differs from bus-interface speed and varies with card performance. Check the specific card’s manufacturer-rated performance for an estimate of what that card can deliver, rather than treating the UHS-II ceiling as a promise.
The host device also sets a limit. To use UHS-II’s higher interface capability, both the card and the camera or reader must support UHS-II. The Association recommends matching the supported interfaces for best performance; its bus-interface guidance explains the distinction.
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Will a UHS-II card work in my camera?
The SD Association says the first row of contacts on a UHS-II card provides backward compatibility with conventional host interfaces. In an older compatible camera that does not support UHS-II, the card should operate using the interface that camera supports, not at UHS-II rates. Check your camera manual for both interface compatibility and the card families and capacities it accepts.
For faster in-camera transfers, the camera must support UHS-II. For faster offloads to a computer, the reader must support UHS-II too; using a UHS-II card in a slower reader will not provide the higher interface capability.
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Is UHS-II the same as U3 or V60?
No. UHS-II identifies the bus interface; U1, U3, V60, and V90 are speed-class markings that communicate minimum sequential performance under defined conditions. Those classes are particularly relevant to sustained recording, where a camera needs a card capable of keeping up with its write demands. The SD Association says U1 and U3 can be applied to UHS products, while V60 and V90 apply to UHS-II and UHS-III products. Its Speed Class overview describes the markings.
For video, follow the camera manufacturer’s required sustained write class for the recording mode you intend to use. A UHS-II label alone does not establish that a card meets the camera’s recording requirements.
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Does UHS-II mean the card has more storage?
No. Capacity is described separately by the card family. SDHC covers capacities over 2 GB through 32 GB; SDXC covers over 32 GB through 2 TB. UHS-II is available on SDHC, SDXC, and SDUC cards, so the interface label does not determine how much data the card stores. See the SD Association’s capacity guidance and SD standard overview.
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How to choose a card for your camera or reader
- Check the host’s interface. Look in the camera or reader specifications for UHS-I or UHS-II support. Choose UHS-II if you need its higher interface capability and the host supports it.
- Confirm the card family and capacity. Verify that the device supports the SDHC, SDXC, or SDUC family and capacity you plan to use.
- Match the required recording class. For video or other sustained capture, use the speed class required by the camera for the chosen mode; do not select by interface maximum alone.
- Consider where speed matters. A compatible camera matters for in-camera performance; a compatible reader matters for transfers to a computer.
- Compare card-specific ratings. Check the manufacturer’s read/write specifications for the exact card, since the interface ceiling is not its guaranteed performance.
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