MicroSDXC memory card EMTEC ECMSDM128GEXG 128 GB UHS-I read 880 MB/s write 550 MB/s U3 V30

EMTEC ECMSDM128GEXG is a 128 GB MicroSDXC memory card with a UHS-I interface designed for high-speed file transfer and reliable recording of high-bitrate video. With declared read speeds up to 880 MB/s and write speeds up to 550 MB/s, this card is classified U3 and V30 to support sustained video capture. The card is rated waterproof and is intended for use in devices where fast sequential and random access improves performance.

Advantages

The card offers high sequential read and write performance suitable for fast file transfers and responsive app loading on compatible devices. U3 and V30 classifications indicate sustained write capability for 4K and high-bitrate video recording. Built-in waterproof protection increases durability for use in outdoor or mobile environments.

Suitable for

• Action cameras and drones requiring sustained write speeds for video capture
• Smartphones and tablets for app storage and faster app performance
• Portable gaming devices and consoles needing additional game storage
• High-speed file transfer workflows from cameras or mobile devices

When it may not be suitable

This MicroSDXC card requires a device that supports MicroSDXC and UHS-I performance to benefit from the highest read/write speeds; older devices or basic card readers may limit throughput. It is not a direct replacement for cards designed for specialized enterprise endurance workloads if extremely high write endurance is required.

Key specifications

• Capacity: 128 GB
• Form factor: MicroSDXC
• Interface: UHS-I
• Maximum read speed: up to 880 MB/s
• Maximum write speed: up to 550 MB/s
• Speed classes: U3, V30
• Durability feature: waterproof

How to use

Insert the MicroSDXC card into the MicroSD card slot of a compatible device such as a smartphone, tablet, action camera, drone or gaming device. Format the card in the device if prompted to ensure optimal file system compatibility. For large transfers, use a host device or card reader that supports UHS-I speeds to take full advantage of the read and write performance.

What to consider before purchase

• Confirm your device supports MicroSDXC cards and UHS-I interface to achieve advertised speeds.
• Check your intended workload (video resolution, bitrate, app use) to ensure U3/V30 classification is sufficient.
• Consider using a high-speed card reader or compatible host to avoid bottlenecks during transfers.

Usage recommendations

For reliable video capture, use the card in devices set to appropriate recording formats and bitrates for U3/V30 class cards. Regularly back up important data, and if you plan heavy continuous recording or high-frequency rewrite cycles, monitor card health and keep spare cards available.