SanDisk
SanDisk SDSQXCY-064G Micro SD Extreme Pro 2-Pack
★★★★★
4KUHD
Two 64GB cards rated at 170MB/s read and 90MB/s write give you sustained 4K UHD capture headroom and a backup card in one bundle.
$28.60*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.
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Overview
Key Features
Bundle includes (2) 64GB Micro SD Extreme Pro SanDisk Memory Cards with Adapters and (1) Everything But Stromboli (TM) MicroSD Card Reader
Compatible with the GoPro Hero 8 Black, GoPro Max 360 Action 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, 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
64GB (per card)
Bundle Quantity
2 Micro SD cards, 1 adapter, 1 card reader
Read Speed
Up to 170MB/s
Write Speed
Up to 90MB/s
Speed Class
Class 10
UHS Speed Class
U3
Application Performance Class
A2
Video Speed Class
V30
Video Support
4K UHD, Full HD, Virtual Reality, 360° video recording
Durability
Temperature-proof, water-proof, shock-proof, x-ray proof
Compatibility
GoPro Hero 8 Black, GoPro Max 360 Action Cameras, smartphones, drones, tablets
Pros & Cons
👍 Pros
- 170MB/s peak read speed makes offloading a full 64GB card to a computer over USB noticeably faster than standard UHS-I cards rated at 100MB/s.
- V30 video speed class guarantees the 30MB/s minimum write floor needed for uninterrupted 4K UHD capture at action camera bitrates.
- A2 application performance rating (4,000/2,000 IOPS read/write) supports direct app execution on Android devices alongside video capture duties.
- The two-pack format means you carry a hot spare without purchasing a second card separately — useful during multi-day shoots or events where offloading mid-session isn't practical.
- Waterproof, shockproof, temperature-proof, and X-ray proof construction makes these cards appropriate for action cameras mounted to boards, helmets, or bikes in wet conditions.
👎 Cons
- These are UHS-I cards — the 170MB/s read rating approaches the UHS-I bus ceiling (~104 MB/s theoretical), meaning real-world sustained reads in a UHS-I reader will land lower than the peak spec, closer to 100–130MB/s in practice.
- The bundled card reader is a basic USB-A device; users with newer laptops that have USB-C only ports will need a separate adapter not included in the bundle.
- At 64GB per card, capacity fills quickly when recording high-bitrate 4K footage for extended periods — a 100Mbps bitrate exhausts 64GB in roughly 85 minutes of continuous recording.
- The write speed advantage over mid-tier U3 cards is most apparent during burst photography or high-bitrate recording; for standard 1080p video use, the performance premium over cheaper cards is largely undetectable.
Frequently Asked Questions
What does the A2 application performance rating mean for these cards?
A2 specifies minimum random read performance of 4,000 IOPS and random write of 2,000 IOPS. That matters when a card is running apps directly from storage — on Android devices and some action cameras — where random I/O, not just sequential throughput, determines responsiveness. For pure 4K video capture, the V30 rating (minimum 30MB/s sustained write) is the more directly relevant spec.
What is the actual sustained write speed for 4K video capture, and will these cards keep up?
The V30 rating guarantees a minimum 30MB/s sustained sequential write floor — 4K UHD at typical action camera bitrates (around 60–100Mbps, or 7.5–12.5 MB/s) sits comfortably below that ceiling. The rated peak write of 90MB/s provides meaningful headroom above that floor before the card throttles.
Are these cards compatible with UHS-I or UHS-II devices only?
These are UHS-I cards (U3 rating), meaning they operate on the single-row UHS-I bus. They are backward-compatible with UHS-I host devices and will function in standard SD/microSD slots, but they will not achieve UHS-II speeds even in a UHS-II reader — the cards don't have the second row of contacts.
What does the bundled card reader support?
The included Everything But Stromboli microSD reader connects via USB and reads the cards directly without an adapter. It's a practical addition for transferring footage to a laptop — useful if your machine lacks a built-in SD slot or you want dedicated high-speed offload without tying up a port.
How durable are these cards in field conditions?
SanDisk rates the Extreme Pro line as temperature-proof, waterproof, shockproof, and X-ray proof. These aren't just marketing claims — SanDisk publishes the relevant testing standards. The waterproof rating covers submersion up to 1m for 30 minutes (IPX7 equivalent), relevant for underwater action camera use or incidental exposure in rain or water sports.
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