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Memory Card Buying Guide: What to Look Out For

The choice of the right memory card depends entirely on your device and the use you intend for it. Not all devices require the most expensive card on the market. See below the key points that will help you choose correctly.

Updated 01/07/2026

1. Card Type: Will it fit my device?

Before checking speeds, make sure of the physical size your device supports:

microSD: The smallest in size. Used in smartphones, tablets, Nintendo Switch, drones and action cameras (e.g. GoPro). They usually come with an adapter to fit into SD slots as well.
SD (Secure Digital): The standard size for cameras (DSLR/Mirrorless) and laptops.
CFexpress / CompactFlash: Designed for professional photographers and filmmakers who require extreme write speeds (e.g. 8K RAW video).

2. Capacity (GB): How much space do I need?

32GB - 64GB: Ideal for basic use on mobile devices, storing documents or MP3s.
128GB - 256GB: The "golden mean" for most users. Can store thousands of high-resolution photos and several hours of 4K video.
512GB and above: Essential for gamers (Nintendo Switch/Steam Deck) or if you record 4K/60fps video on a daily basis.

3. Write Speed: The Key for Video

Many people confuse it with read speed, but for video recording we are interested in the write speed. Look for the following symbols:

V10 / U1: Suitable for Full HD video.
V30 / U3: The necessary requirement for stable 4K video without interruptions.
V60 / V90: Professional specifications for 8K video or shooting photos in Burst RAW mode.

4. Special Usage Categories

Depending on the device, there are some details that make a difference:

For Dash Cams & Security Cameras: Choose cards labeled High Endurance. They are designed to withstand thousands of hours of continuous recording and extreme temperatures.
For Smartphones & Tablets: Prefer cards with A1 or A2 certification. This means that the apps and games installed on the card will run much faster.
UHS-I vs UHS-II: UHS-II cards have a second row of pins on the back. They are much faster, but more expensive. Buy them only if your camera supports them, otherwise they will work as regular cards.

Extra Tip: Don't forget to format the card using the device you will use it with (e.g., through your camera's menu) before first use, to ensure maximum compatibility and speed.