Micro SD-Cards: All you need to know on which ones to buy

In the digital age, where photos, videos, and data are our cherished treasures, micro SD-cards have emerged as the unsung heroes of portable storage. These minuscule memory wonders empower us to carry our digital worlds in our pockets. However, the realm of micro SD-cards isn’t merely about size; it’s about selecting the right class, speed, and capacity to match our needs. In this comprehensive guide, we delve into the nuances of micro SD-cards, demystifying the criteria that define their performance and helping you make informed choices.

The one which I personally use is the Sandisk Extreme 512GB U3 A2, it is has fast read/write speeds which is perfect for 4K Ultra HD Videos. Continue reading to know exactly why this is my choice.

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Understanding Micro SD Card Classes:

Micro SD-cards are classified based on their minimum sustained write speeds. These classes are denoted by numbers enclosed within a circle on the card. The most common classes include:

Class 2: Suitable for SD video recording at 720p resolution, with a minimum write speed of 2 MB/s.

Class 4: Suited for HD video recording at 720p, offering a minimum write speed of 4 MB/s.

Class 6: Ideal for capturing Full HD videos at 1080p, with a minimum write speed of 6 MB/s.

Class 10: Recommended for Full HD video recording and high-resolution photography, boasting a minimum write speed of 10 MB/s.

UHS Speed Classes: UHS (Ultra High-Speed) classes indicate higher minimum write speeds for advanced devices. Look for symbols with a “U” followed by a number, such as U1 or U3. U1 corresponds to a minimum write speed of 10 MB/s, while U3 ensures a minimum write speed of 30 MB/s.

Selecting the Right Speed:

1. Basic Use: For casual smartphone or camera usage, Class 4 or Class 6 micro SD-cards are sufficient. They handle typical photo and video recording tasks smoothly.

2. HD and Full HD Recording: If you’re capturing HD or Full HD videos frequently, consider Class 10 or UHS Class 1 (U1) cards. These ensure smooth recording without dropped frames.

3. 4K Video and Burst Photography: If you’re into 4K video recording or capturing bursts of high-resolution photos, opt for UHS Class 3 (U3) cards. They offer the required speed to handle the heavy data flow.

Capacity Considerations:

Micro SD-cards come in various capacities, from a few gigabytes to several terabytes. Your choice depends on how much data you need to store. Consider the following guidelines:

1. Light Usage: For basic documents, music, and a few photos, 16GB to 32GB cards are suitable.

2. Moderate Usage: If you’ll be storing more photos, videos, and apps, 64GB to 128GB cards offer a good balance.

3. Heavy Usage: Professional photographers and videographers might need 256GB to 1TB cards for ample storage space.

Compatibility and Read Speeds:

When purchasing a micro SD-card, ensure compatibility with your device. Some older devices might not support UHS classes. Additionally, consider read speeds, especially when transferring data to and from the card to a computer.


The world of micro SD-cards isn’t about choosing the smallest or most colorful card; it’s about selecting the right class, speed, and capacity to align with your usage scenarios. Whether you’re capturing family moments, filming breathtaking landscapes, or juggling professional tasks, understanding these criteria empowers you to make smart decisions. As you delve into the micro SD-card landscape, remember that it’s not just about storage—it’s about ensuring your digital experiences are seamless, speedy, and perfectly preserved.

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