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Small red microSD card with white SanDisk Extreme label

SanDisk

SanDisk Extreme 128GB UHS-I U3 microSDXC Memory Card

SKU CH-RM8S-JRSPS

High-capacity 128GB microSDXC card delivers 245MB/s read and 170MB/s write speeds for 4K UHD video and fast app loading

  • 128GB capacity stores extensive photos and videos
  • Read speeds up to 245MB/s enable quick file access
  • Write speeds up to 170MB/s support 4K UHD recording
  • U3 and V30 ratings guarantee smooth 4K video capture
  • A2 rating loads apps quickly for enhanced device experience

Capacity and use-case

This SanDisk Extreme microSDXC card provides 128 GB of removable storage for action cameras, drones, Android devices, laptops and handheld gaming consoles. It targets enthusiasts and creators who need reliable capacity for high-resolution photos, 4K UHD video and app installation. Buyers who require more than 128 GB should consider the larger 256 GB, 512 GB or 1 TB variants in the same range.

UHS-I bus limits

The card uses the UHS-I interface, so maximum sequential read speed reaches 245 MB/s while write speed tops out at 170 MB/s on the higher-capacity models. U3 and V30 ratings guarantee a minimum sustained write of 30 MB/s for uninterrupted 4K UHD recording. Devices limited to the older UHS-I bus cannot exceed these throughput figures regardless of card rating.

Durability and daily handling

SanDisk designs the Extreme line to withstand temperature extremes, water, shock and X-ray exposure, protecting footage during outdoor shoots and travel. The microSDXC form factor fits directly into compatible slots or works with the included SD adapter for full-size readers. A2 rating ensures quicker app loading and smoother multitasking when the card hosts applications on phones or consoles.

Highlights

  • 128GB capacity stores extensive photos and videos
  • Read speeds up to 245MB/s enable quick file access
  • Write speeds up to 170MB/s support 4K UHD recording
  • U3 and V30 ratings guarantee smooth 4K video capture
  • A2 rating loads apps quickly for enhanced device experience

Specifications

No published specifications for this item yet.

Questions about this item

Which capacity should I pick — 128GB, 256GB, 512GB or 1TB?

The 128GB card offers up to 245MB/s read and up to 170MB/s write. The 256GB, 512GB and 1TB models share the same read speed and also deliver up to 170MB/s write, so choose the smallest size that fits your footage and app library.

What does the 245MB/s read speed actually give me in daily use?

It lets you offload large batches of 4K UHD clips or high-resolution photos to a computer in a fraction of the time a slower card would take, keeping your editing workflow moving.

How does the UHS-I U3 and V30 rating affect real-world recording?

Both ratings guarantee a minimum sustained write of 30MB/s, which is the threshold needed for smooth 4K UHD and Full HD video capture without dropped frames.

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