SanDisk Extreme PRO microSDXC Card 256GB
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A dependable high-capacity microSD card with the write speed video recording actually needs, from a brand with a long track record in memory cards.
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ASIN: B09X7DMBVFModel: SDSQXCD-256G-GN6MACategory: MicroSD Cards
Overview
The SanDisk Extreme PRO 256GB microSDXC is a Class 3 UHS-I (U3) V30 card rated for a roughly 60 MB/s write speed, built to keep up with high-definition video recording on a phone, tablet, action camera or drone. 256GB gives enough room for extended video sessions plus a large photo library.
As a straight memory upgrade it is a low-risk purchase category, useful for anyone whose device is refusing 4K recording or running out of space mid-shoot.
- 256GB microSDXC capacity
- Class 3, UHS-I, V30 speed rating
- About 60 MB/s write speed
- Suited to HD and 4K video recording
Who it's for
A fit for anyone recording HD or 4K video on a phone, action camera or drone who needs both the write speed and the capacity to avoid interruptions. Overkill for someone who only stores music or documents and never records video.
Pros and cons
- V30 rating supports sustained high-definition video recording
- 256GB holds a large amount of video and photos
- UHS-I U3 speed class is widely supported by cameras and phones
- Listing gives no adapter or read-speed detail beyond write speed
- 256GB capacity costs more than smaller cards for buyers who do not need the space
Performance notes
The V30 rating guarantees a minimum sustained write speed of 30 MB/s, which is what keeps 4K video recording from stuttering or dropping frames, while the listing cites a write speed around 60 MB/s in practice. UHS-I and Class 3 (U3) are the interface and speed class standards that make the card compatible with cameras and phones built for high-bitrate recording.
Where it stands among microsd cards
- #1 most-searched brand and model of the 27 microsd cards lines we track (by search demand, not sales).
From the specs of the 17 microsd cards we list; not a test result.
Specifications
| Brand | SanDisk |
|---|---|
| Model | SDSQXCD-256G-GN6MA |
Frequently asked questions
Is the SanDisk Extreme PRO 256GB fast enough for 4K video?
Yes, its V30 rating guarantees a sustained write speed built for 4K recording, and the listing cites around 60 MB/s in practice.
What does U3 mean on this SanDisk card?
U3 is the UHS speed class, indicating a minimum sustained write speed suited to high-definition and 4K video recording.
How much storage does this SanDisk microSDXC card offer?
256GB, enough for extended video recording sessions along with a large photo library.