SanDisk
SanDisk SDSDQXCZ-256G 256GB Extreme Pro MicroSD Card
★★★★★
4KUHD
U3/V30/A2-rated at 170MB/s read — this 256GB microSD handles simultaneous 4K capture and app execution without throttling.
$32.11*
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*Price sourced from Amazon.com. Last updated:Jun 04, 2026.Price and availability are subject to change.
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Overview
Key Features
Bundle includes (1) 256GB Micro SD Extreme Pro SanDisk Memory Card with Adapter and (1) Everything But Stromboli (TM) MicroSD Card Reader
Compatible Memory card for action cameras Insta360 One X 360 camera, Insta360 EVO smartphone 360 cameras, Insta360 Titan, Insta360 Pro 2, Insta 360 Pro professional VR cameras
Temperature-proof, water-proof, shock-proof and x-ray proof - built for tough conditions!
Transfer speeds of up to 170MB/s read and 90MB/s write speeds for your action cam, smartphone, professional VR cam, drone or tablet
Featured specs include Class 10, UHS Speed Class 3 (U3), A2, Video 30 (V30), 4K UHD and Full HD which means your card is ready for forays into virtual reality and 360 ° video recording
Specifications
Capacity
256GB
Type
microSDXC
Max Read Speed
Up to 170MB/s
Max Write Speed
Up to 90MB/s
Speed Class
Class 10, UHS-I U3, V30, A2
Durability
Temperature-proof, Waterproof, Shockproof, X-ray proof
Compatible Devices
Insta360 One X, EVO, Titan, Pro 2; action cameras; drones; Android smartphones
Bundle Includes
SD adapter + Everything But Stromboli microSD card reader
Model
SDSDQXCZ-256G-GN6MA
Pros & Cons
👍 Pros
- 170MB/s read speed enables fast file offloading from the card to a computer — emptying a fully loaded 256GB card to a fast drive takes under 30 minutes at peak throughput.
- V30 minimum 30MB/s write certification guarantees uninterrupted 4K recording on all V30-compliant devices, eliminating dropped frame risk during sustained capture.
- A2 random I/O spec supports running apps directly from the card on Android devices without the performance degradation seen on slower A1 or unrated cards.
- The four-axis durability rating — temperature, water, shock, X-ray — makes this card suitable for action cameras, drones, and field use where consumer-grade cards fail.
- 256GB capacity provides over 1 hour of 4K video recording headroom on most action cameras before reaching capacity, reducing mid-session card swaps.
👎 Cons
- The 90MB/s maximum write speed, while fast for a microSD, is well below the sustained write capability of NVMe or even SATA SSD storage — high-bitrate multi-camera 360 rigs can push up to or beyond this ceiling under thermal stress.
- Performance at the 170MB/s read rating requires a USB 3.x card reader; the included Everything But Stromboli reader's USB generation is not specified, potentially limiting real-world offload speeds.
- microSDXC format means compatibility requires the host device to support SDXC — older devices supporting only SDHC are limited to 32GB and cannot use this card.
- Sustained 4K write performance can thermal-throttle in high-ambient-temperature environments (direct sun on a drone or action camera), with the card's physical size providing minimal thermal mass for heat dissipation.
- At 256GB, this capacity tier carries a premium over 128GB cards while delivering less than double the usable capacity of cards that can be found at comparable prices across other brands.
Frequently Asked Questions
What do the U3, V30, and A2 speed class ratings on this card actually mean for recording?
U3 guarantees a minimum 30MB/s sustained write speed; V30 is the video-specific equivalent, confirming minimum 30MB/s for continuous video recording. A2 specifies minimum 4000 IOPS random read and 2000 IOPS random write, which is the performance floor required for running apps directly from the card. Together, these three ratings confirm this card can handle 4K video recording and app storage simultaneously without the write speed floor dropping below what the device requires.
What is the maximum sequential read and write speed on this card?
The card is rated at up to 170MB/s sequential read and 90MB/s sequential write. In real-world use — action cameras, drones, and smartphones — the write speed under sustained 4K recording will vary by device and thermal conditions, but V30 certification ensures the minimum floor is maintained.
Is this card compatible with the Insta360 ONE X and similar 360-degree cameras?
Yes, compatibility is specifically listed for Insta360 One X, Insta360 EVO, Insta360 Titan, and Insta360 Pro 2. 360-degree cameras write to multiple sensors simultaneously, creating high sustained write demands — the V30 minimum write speed rating ensures this card meets the throughput floor those devices require.
What does the durability rating cover — can this card withstand a drone crash or submersion?
SanDisk rates the Extreme Pro as temperature-proof, waterproof, shockproof, and X-ray proof. Waterproofing covers submersion up to a specified depth per IEC standards. Shockproof certification covers standard drop impacts. These ratings cover survival during typical real-world incidents — a drone crash landing in water or going through airport X-ray — though extreme physical damage (direct crushing impact) is not covered.
Does this bundle include an SD adapter, and can I use it in a standard SDXC slot?
Yes, the bundle includes a microSD-to-SD adapter, allowing use in standard SD card slots found on laptops, DSLRs, and card readers. The Everything But Stromboli microSD card reader included in the bundle provides direct USB connection for computers that lack a built-in card slot.
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