Memory Card (microSD)

microSD cards come in several capacity standards. Each one supports different maximum storage sizes:

• microSD: Older standard — up to ~2 GB

• microSDHC (High Capacity): ~2 GB to 32 GB

• microSDXC (Extended Capacity): ~32 GB to 2 TB (most common today)

• microSDUC (Ultra Capacity): Up to ~128 TB (emerging standard)

➡️ Always check your device specs — not all devices support larger formats.

🚀 2. Speed Ratings / Classes

These determine how fast the card can read and write data, which affects things like video recording, file transfers, and loading apps:

📈 Basic Speed Class

• Class 2 / 4 / 6 / 10: Minimum write speeds from 2 MB/s (Class 2) up to 10 MB/s (Class 10).
  Class 10 is the baseline for modern use (HD video, photos).

⚡ UHS (Ultra High Speed)

• U1: Minimum write ~10 MB/s

• U3: Minimum write ~30 MB/s — better for 4K video.

Cards marked U1/U3 generally give faster real‑world performance than just Class numbers.

🎥 Video Speed Class

Suitable for high‑resolution video:

• V10, V30, V60, V90 — indicating higher minimum sustained write speeds for 4K/8K video.

🔁 3. Application Performance Class (A1 / A2)

This tells you how well the card handles small random data tasks — like running apps or loading game files:

• A1: Good general app performance

• A2: Faster app performance with higher random read/write speeds

📂 4. Read & Write Speeds

• Read Speed: How fast the card can send data to your device or computer
• Write Speed: How fast the card can save data (important for recording video or shooting lots of photos)
Cards with higher speeds mean quicker transfers and smoother 4K/8K video recording.

🔌 5. Compatibility

Not all devices support every microSD format — older devices may only accept microSD or microSDHC, while newer ones support microSDXC. Always check your device specs before buying.

🛡️ 6. Durability Features

Quality microSD cards often include protections such as:

• Water resistance

• Shock and vibration proofing

• Temperature tolerance

• X‑ray and magnetism resistance
  These matter if you use the card in action cameras, phones, or outdoors.