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Small black microSD card with gold contacts and full-size SD adapter

Silicon Power

Silicon Power Superior 256GB microSDXC UHS-I Memory Card

SKU CH-ANQZ-6MKNM

256GB microSDXC card with UHS-I U3, V30 and A1 ratings for 4K recording and fast app performance, up to 100MB/s read and 80MB/s write

  • TypeMicroSD
  • Capacity256GB
  • Speed Class RatingClass 10
  • Stores hours of 4K footage with 256GB capacity
  • Sustains 4K Ultra HD recording via U3 and V30 ratings
  • Reads up to 100MB/s for fast file transfers
  • Writes up to 80MB/s for smooth capture
  • Boosts app launches with A1-rated 1500 read IOPS and 500 write IOPS

Capacity & Speed Ratings

This 256GB microSDXC card carries UHS-I U3, V30, Class 10 and A1 ratings. It is built for users who need reliable storage for 4K video recording and app-heavy mobile devices. The included full-size SD adapter adds flexibility for camera slots and card readers.

Read/Write Performance

Sequential read reaches 100MB/s while write tops out at 80MB/s. Random access delivers 1,500 IOPS read and 500 IOPS write, keeping Android apps responsive. Sustained 4K capture is supported, but extended high-bitrate bursts or simultaneous heavy I/O may hit the write ceiling.

A1 App Performance Class

The A1 rating guarantees minimum random read of 1,500 IOPS and random write of 500 IOPS. This single spec decides if the card will keep phone and tablet apps launching quickly. Buyers who need faster sustained write speeds or higher random IOPS for intensive workloads should look elsewhere.

Highlights

  • Stores hours of 4K footage with 256GB capacity
  • Sustains 4K Ultra HD recording via U3 and V30 ratings
  • Reads up to 100MB/s for fast file transfers
  • Writes up to 80MB/s for smooth capture
  • Boosts app launches with A1-rated 1500 read IOPS and 500 write IOPS

Specifications

TypeMicroSD
Capacity256GB
Speed Class RatingClass 10

Questions about this item

Will this 256GB microSDXC card work in my older camera that only supports UHS-I and Class 10?

Yes, the card is rated UHS-I U3 and Class 10, so it will operate at UHS-I speeds in your camera.

How can I verify the card delivers the rated 100MB/s read and 80MB/s write speeds after I set it up?

Run a benchmark tool such as CrystalDiskMark or ATTO on a PC using the included SD adapter; sequential results should approach 100 MB/s read and 80 MB/s write.

Does the package include the full-size SD adapter, or do I need to buy one separately?

The card comes with a full-size SD adapter in the box; no separate purchase is required.

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