I used to label the memory card with the name of my favorite game until a better one came out.

 I used to label the memory card with the name of my favorite game until a better one came out.

I used to label the memory card with the name of my favorite game until a better one came out.

The SD Association is in charge of marketing and labeling various memory card classifications, features, and specifications. There are various classifications labeled on both the packaging and the memory card itself, but it can be difficult to sort through the jargon to understand what they really mean.


The speed class is one of the most important aspects of the memory card classifications. Some cards are frequently labeled with a combination of two, which can be confusing. It began with the original speed class, with C2, C4, C6, and C10 indicating the minimum write speed of 2MB/s, 4MB/s, 6MB/s, and 10MB/s, respectively. The UHS Speed Class was then added, denoted by either U1 or U3 to indicate minimum write speeds of 10MB/s and 30MB/s, respectively.


Because the SD Association continued to add new speed classes with new naming conventions, manufacturers began renaming them to label them on memory cards, which can be difficult to follow. For example, a card may be labeled C10 and U1, even though they both mean the same thing. A camera manufacturer may require a C10-rated SD card, but since the SD Association has moved on to the UHS Speed Class and begun labeling its cards as such,

To make matters worse, card manufacturers insist on using the older speed classes alongside the newer speed classes, despite the fact that their card speeds have long surpassed the older speed classes. As a result, there are cards with the designations C10 and U3. If U3 indicates a minimum write speed of 30MB/s and C10 indicates a minimum write speed of 10MB/s, listing both speed classes is redundant because U3 already indicates a write speed greater than 10MB/s. The latest Video Speed Class is designed for higher resolution videos like 4K or 8K, but a V30 card is the same as a U3 card because both have a minimum write speed of 30MB/s.


SD card sleeve

Because of the variety of naming conventions, it is the responsibility of both memory card and device manufacturers to ensure that consumers can find what they are looking for. For the average consumer who is unfamiliar with the naming conventions and labels, this results in memory cards labeled with all three Class-C, UHS, and Video standard speed classes.


The UHS bus interface, which is denoted by a Roman numeral "I" or "II" symbol, is one classification that is specifically labeled on UHS Speed Class cards. It's usually written as "UHS-I" and "UHS-II," but to comply with the SDA logo guidelines, many card manufacturers are omitting the UHS lettering and simply using a "I" or "II" symbol to indicate the type of UHS bus interface on the card.


Finally, with the introduction of Android's Adopted Storage Device feature, a new classification has been introduced. Under specified conditions, the App Performance Class guarantees minimum random and sequential performance speeds to meet both run and store execution time requirements. It does all of this while also storing photos, videos, music, files, and other important data. In general, these devices are best suited for use in smartphones and mobile gaming devices that run applications at random read and write speeds while also serving as storage.

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