When shopping for a new memory card for a phone, camera, or other device, it’s easy to get confused by all the different speed ratings and classifications. So, what exactly is the difference between Class 10 and UHS-I micro SD cards?
Class 10 and UHS-I are both speed classifications for micro SD memory card technology. Still, UHS-I is newer and faster, offering minimum write speeds of 10 MB/s (like Class 10) but potential maximum speeds up to 104 MB/s.
While this explanation covers the basic difference, it’s worth reading on to understand when each type matters for your specific device and use case. Choosing the wrong card could mean wasted money on unnecessary speed capabilities or, worse, performance issues with your device.
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When Should You Choose Class 10 vs UHS-I Micro SD Cards?
The choice between Class 10 and UHS-I largely depends on your device and how you plan to use it. Class 10 cards are perfectly suitable for basic photography, HD video recording, and general storage in older devices. If you’re using a smartphone that’s more than a few years old or a basic point-and-shoot camera, a Class 10 card will likely meet all your needs.
UHS-I cards become essential when working with newer devices, especially those capturing 4K video or burst-mode photography. They’re also beneficial for gaming devices like the Nintendo Switch, where faster load times can enhance the experience. However, it’s important to note that you’ll only get UHS-I speeds if your device specifically supports this standard.
What Do the Numbers on Micro SD Cards Actually Mean?
The number system on SD cards can seem like a cryptic code at first. Class 10 indicates a minimum write speed of 10 megabytes per second (MB/s). This number system started with Class 2 (2 MB/s) and went up to Class 10, which was the highest in the original classification system.
UHS-I takes this further by introducing speed classes like U1 (10 MB/s) and U3 (30 MB/s). You might also see numbers like “V30” or “A2” on cards, which refer to video speed class and app performance class, respectively. These additional ratings help users match cards to specific use case,s like 4K video recording or running mobile apps.
Is It Worth Paying Extra For A UHS-I Card?
The price difference between Class 10 and UHS-I cards has narrowed significantly in recent years, but UHS-I cards still typically cost more. The extra cost is worth it if your device supports UHS-I and you need the speed, for example, if you’re recording high-resolution video or transferring large files frequently.
However, if your device doesn’t support UHS-I speeds, paying extra for a UHS-I card won’t provide any benefit – the card will simply operate at the device’s maximum supported speed. It’s always wise to check your device’s specifications before making a purchase to ensure you’re not overspending on features you can’t use.
What About UHS-II And UHS-III Cards?
While comparing Class 10 and UHS-I cards, it’s worth mentioning that there are even faster standards available. UHS-II cards have an additional row of pins and can achieve speeds up to 312 MB/s, while UHS-III cards can reach speeds up to 624 MB/s. However, these cards are significantly more expensive and are primarily used in professional photography and videography equipment.
Most consumer devices don’t support these faster standards, so for the average user, choosing between Class 10 and UHS-I remains the most relevant decision. Additionally, UHS-II and UHS-III cards are backward compatible, meaning they’ll work in devices designed for slower cards, but they’ll only operate at the device’s maximum supported speed.
How Can You Tell If Your Device Supports UHS-I?
The easiest way to determine if your device supports UHS-I speeds is to check the user manual or the manufacturer’s specifications online. You can also look for the UHS-I symbol (a Roman numeral “I” inside a “U” shape) on your device’s SD card slot.
Many devices made in the last 5-7 years support UHS-I, but there are still plenty of older devices in use that don’t. If you can’t find specific information about your device’s SD card compatibility, checking when it was manufactured is a good rule of thumb. Devices made before 2010 are unlikely to support UHS-I speeds, while most devices made after 2012 do support them. When in doubt, using a UHS-I card won’t harm your device – it will simply operate at the slower Class 10 speeds if that’s all your device supports.
Making The Right Choice For Your Needs
Before making your next micro SD card purchase, take a moment to look up your device’s specifications online or in its manual to confirm whether it supports UHS-I speeds. This simple check will ensure you make an informed decision and get the best value for your money, whether that means saving money with a Class 10 card or investing in a UHS-I card that your device can fully utilize.
