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UHS-II M series 256GB
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- High speed transfer up to 277 MB/s (read) and 150 MB/s (write) for performance and efficiency
- V60 Video Speed Class and UHS Speed Class 3 for dependable 4K and high-bitrate video capture
- Compatible with Sony's SD Scan Utility to monitor card write cycle limits and alert you when they are reached
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- Capacity is based on 1 GB = 1 billion bytes. A portion of the memory is used for data management functions and therefore usable storage capacity will be less.
- UHS-II: Up to 277MB/s transfer speed, 150MB/s write speed2. UHS-I: Up to 95 MB/s transfer speed; write speed up to 90MB/s2. Based upon Sony testing using SD Association certified testing tool. Transfer speeds vary and are dependent on host hardware. To effectively utilize the product’s high-speed capabilities, your compatible device must support UHS-II.
- Based on SONY internal testing. We cannot guarantee against damage to record data or card in all situations and conditions. Memory Card File Rescue is available for Windows and is newly available for macOS and also supports Canon CR3 raw format files. The file rescue supports recovery of RAW, XAVC S, and Other Various Data Types for Professional Use. For more information please visit https://www.sony.net/Products/memorycard/en_us/datarescue/index.html
- Waterproof certified to IEC 60529 IP57 standard, dust proof certified to IEC 60529 IPX5 standard, media is durable and data will operate after drop testing from 1.5m, can operate in temperatures between -13 degrees Fahrenheit (25 degrees Celsius) and 185 degrees Fahrenheit (85 degrees Celsius).
- Need to be installed on Windows PC or Mac before using.
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Is the Sony UHS-II M series 256GB (SF-M256) card suitable for 4K video recording?
Yes. With a V60 Video Speed Class and UHS Speed Class 3, along with up to 150 MB/s write speed, it's designed for dependable 4K and high-bitrate video capture.
What read and write speeds does the SF-M256 offer?
In UHS-II mode the card supports high speed transfer up to 277 MB/s read and 150 MB/s write. In UHS-I devices, performance is up to 95 MB/s read and 90 MB/s write.
How much usable storage does the 256GB SF-M256 provide?
Capacity is based on 1 GB = 1 billion bytes, and a portion of the memory is used for data management functions, so the usable storage capacity will be less than the labeled 256GB.
What speed classes does the Sony SF-M256 support?
It supports V60 Video Speed Class and UHS Speed Class 3 (U3), ensuring minimum sustained write speeds suitable for high-resolution photo bursts and 4K video recording.
What devices are compatible with the SF-M256 UHS-II SDXC card?
It works best with UHS-II capable cameras and devices. It's backward compatible with UHS-I and standard SD devices, but transfer speeds will be limited to those devices' maximum speeds, so your device must support UHS-II to fully utilize the card's high-speed capabilities.
Is the SF-M256 durable enough for harsh shooting conditions?
Yes. It's waterproof certified to the IEC 60529 IP57 standard, dust proof certified to the IEC 60529 IPX5 standard, and the media will operate after drop testing from 1.5m, with reliable use in temperatures between -13°F and 185°F.
Does the SF-M256 include any card monitoring or data recovery tools?
Yes. It's compatible with Sony's SD Scan Utility to monitor card write cycle limits and alert you when they're reached, and Sony's File Rescue software can help recover RAW, XAVC S, and other data types.
How much does the Sony UHS-II M series 256GB (SF-M256) card cost?
MSRP is listed as $234.99. Given that, these models can go on sale from time to time, and there are several other opportunities to save on price like through their group discounts for education, healthcare and military/veterans (ID.me & Unidays) along with their free loyalty program that gives up to 5% back in points.
What capacities are available in the Sony UHS-II M series lineup?
The M series is available in 128GB, 256GB, and 512GB options, so you can choose the capacity that best fits your shooting needs.
*FAQ generated on 07/23/2026. Financing, pricing and promotions may no longer apply.