Sandisk Extreme 256GB microSDXC UHS-I Memory Card — A2 app performance, V30 4K-ready

SanDisk 256GB Extreme MicroSDXC is a high-performance microSD card designed for 4K video, fast app loading, and reliable storage in cameras, drones, and smartphones.

This SanDisk Extreme 256GB MicroSDXC (SDSQXA1-256G-GN6MN) combines UHS-I speed with C10, U3 and V30 ratings to handle sustained 4K recording and quick file transfers. It supports the A2 app performance class for faster random read/write operations on compatible devices, and its generous 256GB capacity stores hours of high-resolution video, thousands of photos, or large app libraries. Rugged build quality helps the card resist everyday use in action cameras, drones, and mobile devices.

How fast is this card for 4K video and burst photos?

The card meets U3 and V30 video speed classes, which means it supports a minimum sustained write speed suitable for most 4K video workflows and continuous burst shooting. Sequential read speeds make transferring large files to your computer quicker, while sustained write prevents dropped frames during long recordings.

• U3 / V30: minimum sustained write performance for 4K video
• UHS-I interface: high read throughput for fast file transfers
• Optimized for burst and continuous shooting in action cameras

Will this card improve app performance on phones and tablets?

Yes — the SanDisk Extreme carries the A2 performance class designation, which prioritizes random IOPS needed for app loading and multitasking. When used in compatible Android devices or adapters, apps stored on the card can launch faster and run more smoothly than on standard microSD cards.

• A2 App Performance: better random read/write for apps
• Suitable for expandable storage on Android phones and tablets
• Works best in devices that support A2-class microSD cards

Is this card durable and compatible with my gear?

SanDisk builds Extreme microSD cards to endure everyday conditions, making them reliable for outdoor and mobile use. Compatibility spans a wide range of devices that accept microSDXC format, including cameras, drones, action cams, and many smartphones; check your device’s microSDXC and maximum-capacity specifications for full compatibility.

• MicroSDXC (SD 3.0) format compatible with most modern devices
• Rugged construction suitable for travel and field use
• Use with adapters where full-size SD is required

How do I manage files and protect my data on this card?

Regular backups and safe ejection from devices help protect your files; the card can be paired with SanDisk’s software tools for recovery and management if needed. For mission-critical shoots, using multiple cards or backing up to a computer or cloud storage reduces risk of data loss.

• Use device eject or unmount before removing the card
• Back up important footage to a computer or external drive
• Consider SanDisk recovery tools for accidental deletions

Who is this for: Photographers, videographers, drone pilots, and mobile users who need a reliable 256GB microSD card that supports 4K recording, faster app performance (A2), and quick file transfers. It’s a solid choice for anyone upgrading storage on action cameras, Android phones, dash cams, and compact devices that require microSDXC capacity and UHS-I speeds.