Micro SD/SDHC/SDXC C10 U2 U3 V90 card

DiskMFR micro SD cards are available in various specifications and cover a wide range of applications. Whether you need a high-speed card for your action cam, a high-performance card for your security camera, or just need extra storage for your phone or tablet, we’ve got the card for you.

• Speed Class
• UHS Speed Class
• Video Speed Class

 

Speed Class	UHS Speed Class	Video Speed Class
Speed Class Marked C10	UHS Speed Class Marked U3	Video Speed Class Marked V90

 

 

Numbers with a circular “C” symbol, a “U” symbol, or a “V” symbol next to or around them indicate memory card speed ratings. Manufacturers use these speed class symbols to indicate the type of speed class and rating on the memory card. The goal is to help consumers choose the right memory card for their hardware devices in terms of speed.

 

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Speed Class

The first speed class is known simply as the original speed class, but as it is denoted by a “C” symbol we will refer to it as class C throughout the rest of this guide. There are four classifications within class C:

• C2 (Class 2): minimum write speed of 2MB/s
• C4 (Class 4): minimum write speed of 4MB/s
• C6 (Class 6): minimum write speed of 6MB/s
• C10 (Class 10): minimum write speed of 10MB/s

C2 is the slowest speed class, while C10 is the industry standard. Because newer hardware devices require newer speed classes with higher speeds and capabilities, almost nobody uses Class 2 through 6 today. C10 is typically the minimum speed class for most hardware devices manufactured today.

 

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UHS Speed Class

The next speed class up is the UHS (Ultra-High Speed) Speed Class and it’s denoted with the “U” symbol. There are two ratings within the UHS Speed Class:

• U1 (UHS Speed Class 1): minimum write speed of 10MB/s
• U3 (UHS Speed Class 3): minimum write speed of 30MB/s

 

UHS Speed ​​Class is more commonly used than Speed ​​Class today, and many of the higher-end cameras require at least a U3-rated memory card for many of their features, e.g. B. for recording high-resolution videos. The UHS speed rating primarily refers to the minimum sustained write performance for video recording and arose because 4K-compatible video recording devices require faster write speeds. As a rule of thumb, 4K-capable recording cameras generally require at least a U3 class SD card.

 

What makes the U1 and U3 memory cards more advanced than the Speed ​​Class cards is that they use one of two UHS bus interfaces:

• UHS-I: theoretical maximum transfer speeds up to 104MB/s
• UHS-II: theoretical maximum transfer speeds up to 312MB/s

Both U1 and U3 memory cards can use the UHS-I bus interface but are not compatible with the UHS-II bus interface.

These UHS bus interfaces specify theoretical maximum read and write speeds as opposed to sustained speed class write speeds. UHS bus interfaces are denoted by a Roman numeral symbol “I” or “II” on the face of the card. Bus speeds refer to the theoretical data transfer rate of the interface itself, while a U3-rated SD card has its own sustained write speed of 30MB/s. For example, a card with UHS-I U3 guarantees a write speed of 30 MB/s but has the potential for reading and writing speeds of up to 104 MB/s when used with a compatible bus interface device.

These UHS bus interfaces specify theoretical maximum read and write speeds as opposed to sustained speed class write speeds. UHS bus interfaces are denoted by a Roman numeral symbol “I” or “II” on the face of the card. Bus speeds refer to the theoretical data transfer rate of the interface itself, while a U3-rated SD card has its own sustained write speed of 30MB/s. For example, a card with UHS-I U3 guarantees a write speed of 30 MB/s, but has the potential for read and write speeds of up to 104 MB/s when used with a compatible bus interface device.

A UHS-II compliant card has a potential read and write speed of up to 312MB/s. UHS bus interfaces are backward compatible, so you can use a UHS-II card in a UHS-I compatible device, but you won’t see the speed benefits of UHS-II because the card defaults to UHS’s lower specs – I. Both the card and the bus interface must be fully compatible to take advantage of the speed.

 

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Video Speed Class

The latest video speed class was created to enable higher video resolution and recording capabilities such as multiple video streams, 360-degree recording, VR content, and 4K or 8K resolution videos. They are usually marked with the “V” symbol. There are five classifications for video speed classes:

• V6 (Video Speed Class 6): minimum write speed of 6MB/s
• V10 (Video Speed Class 10): minimum write speed of 10MB/s
• V30 (Video Speed Class 30): minimum write speed of 30MB/s
• V60 (Video Speed Class 60): minimum write speed of 60MB/s
• V90 (Video Speed Class 90): minimum write speed of 90MB/s

The video speed class is unique in that it can use both the UHS-I and UHS-II bus interfaces. Speed ​​class V6 to V90 memory cards can use the UHS-II bus interface, but the UHS-I bus interface only supports speed class V6 to V30 memory cards.

Video Speed ​​​​​​Class offers the fastest speeds available and is ideal for ultra high definition video, high-quality video, and multi-file recording on drones and 360 cameras. Supports HD video formats up to 8K on drones, 360 cameras, action cameras, and VR cameras.

You can find the best card for your hardware device by selecting the same speed class or higher that your device requires. For example, if your device requires a class 4 memory card, you can use speed class 4, 6, or 10. If your device requires a UHS Speed ​​Class 1 card, you can use UHS Speed ​​Class 1 or 3. The same functionality applies to Video Speed ​​Class as well. for a device, it still works but you don’t get all the benefits of the higher speed class because the device only supports the lower speed class.