SanDisk Express microSD Card, 256GB Up to 880MB/s Read, Up to 650MB/s Write, 210MB/s Sustained Write, U3, C10

Unmatched Next-Gen Specs This card represents a massive leap forward in storage technology. By utilizing a PCIe Gen 3-NVMe interface, it boasts peak read speeds of up to 880MB/s, write speeds of 650MB/s, and sustained writes of 210MB/s. This effectively gives you portable SSD performance in a tiny microSD form factor. Real-World Gaming Performance While unlocking those advertised peak speeds requires specialized hardware, this card is remarkably impressive on current handhelds. When paired with the Steam Deck and the original Nintendo Switch, the card is amazingly fast. Because it falls back to perfectly max out the standard UHS-I speeds of those consoles, your game load times, file transfers, and level transitions will remain exceptionally snappy and responsive. The Special Hardware Caveat To fully experience the exponential leap in speed (up to 4.4x faster than standard UHS-I), you need an SD Express-compatible reader or a future device that supports the PCIe-NVMe bus. However, its flawless backward compatibility means you get top-tier performance today while completely future-proofing your storage for tomorrow's hardware. Final Verdict Even if you don't currently have the dedicated hardware to hit the 880MB/s ceiling, this card is a fantastic investment. It delivers incredibly fast, reliable performance for current-generation consoles, making it a highly recommended choice for any handheld gamer.

I bought it for the Switch 2 and it works fine.

Switch2購入サイトで品切れのため購入。対応してたので良かった。他の使い道は未検討

Świetny produkt piekielnie szybki.

Update 06/07/2025, Comparing to Onn's Express 256: There is a new budget microSD 256 Express card from Onn that appeared in retail this week coinciding with the launch of the Switch 2. It claims to support up to 800MB/s reads and 600MB/s writes. I picked one up to compare. With larger stress tests (Random reads and writes going up to 5GB instead of the 1GB test I show here), this SanDisk can see its transfer rate drop to a minimum of 400GB/s on writes. For the Onn device, on writes the rate drops to 200MB/s typically, but sometimes as low as 150MB/s as the firmware seems to have trouble keeping up (it stalls completely), nearly 3 times slower on average than the SanDisk. What's worse is that it drops to 400GB/s even for transfers as small as 2GB, 300GB/s for 3GB, and 200GB/s from there on up, while the SanDisk still manages to hold minimum 600GB/s. Keep in mind that most larger games for the Switch 2 are about 20GB or more, and there are a few 64GB or larger. I do not currently own a PNY card to test, but online evidence suggests that it too is slower than the SanDisk, but may be faster than the Onn device. With the way the Onn card stalls on writing, literally stopping occasionally for upwards of a second while testing, I could never recommend it. You get what you pay for with the SanDisk. Full review follows. REVIEW: During play, the Onn express card may be able to keep up due to small transfers and minimal loads, but its stalls will affect things, and during download and game management on the Switch 2, you will definitely see a time impact, probably significant. The good news is that the Onn express card was able to hold up on read tests without stalls, with the same 750MB/s as the SanDisk, but it never really went above 750MB/s for even smaller transfers while the Sandisk peaked at about 990MB/s, above their claimed rate. I am sure some caching was involved in that number, but the system caches the Onn in the same way, so there is a significant difference. Great high-speed card if you have a reader that supports Express. This card also outperforms even on a standard controller due to its rapid response time and excellent IOPs (measure of the number it can handle per second). Does well enough to be considered as an external drive on the Mac, though an M.2 reader enclosure will outperform it on specs. Can't beat it for portability. For sustained throughput on the SanDisk Express reader, this can't be beat, easily outperforming any other card I have from 4X to 20X faster. Camera file transfers happen at about 1GB/s. No drivers needed for any recent OS, though Ubuntu has a recent bug that will prevent those devices from attaining full speed unless an external Express-capable reader is used.

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