Western Digital WD_BLACK SN770M 1TB PCIe 4.0 x4 NVMe M.2 2230

5150 MB/s read speed in a 2230 drive is the headline, and the 91st percentile random performance backs it up. 600 TBW endurance and a 5-year warranty make it a safe long-term bet. Prices swing from USD 287 to USD 450, so shop around before you buy.

Sequential reads of 5150 MB/s and writes of 4900 MB/s put this drive well above average for PCIe 4.0 drives, though not at the very top of the charts. The real story is random performance. 740K random read IOPS and 800K random write IOPS are numbers that would have been flagship territory a couple years ago. Now they're sitting in a 2230 drive the size of a postage stamp. That 91st percentile random ranking translates to snappy game loads and quick texture streaming, which is exactly what you want when you're cramming a 100GB title onto a handheld.

TLC NAND is doing the heavy lifting here, paired with Western Digital's nCache 4.0 technology. DirectStorage support is a nice future-proofing touch, though most handheld games won't leverage it yet. The 1,750,000 hour MTBF is a spec sheet number that sounds impressive and mostly just means Western Digital is confident in the silicon. In practice, this drive feels fast in ways that matter for gaming, not just in synthetic benchmarks.

Against the Samsung 9100 PRO, the SN770M actually holds its own on random performance, which is where real-world gaming workloads live. The Samsung drive is a full-size 2280 though, so it's not even a fair fight for handheld users. The Crucial T500 is a closer competitor on price and speed, but it also doesn't come in 2230. The Kingston Fury Renegade offers similar sequential speeds but typically costs less, though you're giving up the compact form factor. For Steam Deck and ROG Ally owners specifically, the SN770M's only real competition is other 2230 drives, and most of those are slower. The SanDisk WD_BLACK WDS400T2XHE is essentially a sibling product with more capacity, but it's a 2280 drive. If you need 2230, this is one of the few drives that doesn't feel like a compromise.

Pricing is all over the place. We're seeing USD 287 to USD 450 across four US listings, which is a USD 163 spread for the exact same drive. That's wild. At the low end, you're paying about USD 0.28 per GB, which is reasonable for a high-performance 2230 drive. At the high end, you're getting fleeced. The affordability percentile sits at 36th, meaning most drives in this category cost less. But most drives in this category also don't hit these speeds in this form factor. If you can find it near the USD 287 mark, it's a solid deal. If you're staring at USD 450, close the tab and wait for a sale.

The WD_BLACK SN770M hits 5150 MB/s read and 4900 MB/s write in a tiny M.2 2230 form factor. That's the headline here. Most drives this size top out around 3500 MB/s, so Western Digital is basically showing off. Our database puts its random performance at the 91st percentile, which means it's one of the absolute best right now for the kind of small-file work that actually matters when you're loading game levels or booting Windows off a cramped handheld.

But the portable score is a real letdown at 19.3 out of 100. That's not a typo. For a drive marketed squarely at Steam Deck and ROG Ally owners, it's strange to see portability rank near the bottom. The catch is that this metric likely reflects the drive's lack of included accessories or its power draw characteristics, not its physical size. The 1TB capacity sits at the 55th percentile, which is about average, but the 600 TBW endurance rating lands at the 88th percentile. That's a lot of write headroom for a drive this small.

If you don't own a device that requires the 2230 form factor, skip this drive. The affordability percentile of 36th means you're paying a premium for the compact size, and you can get faster full-size 2280 drives for less money. The capacity sits at the 55th percentile, so 1TB is nothing special. And if you're looking for a portable external drive, the 19.3 portable score suggests this isn't the right tool for that job. This is a specialist product for handheld gamers and compact laptop owners, not a general-purpose storage upgrade.

The SN770M is the drive to buy if you own a Steam Deck, ROG Ally, or a Surface laptop with a 2230 slot and you're tired of waiting for games to load. The 5150 MB/s read speed and 91st percentile random performance are genuinely impressive for this form factor. The 600 TBW endurance and 5-year warranty mean you won't have to worry about wearing it out. Just don't pay full price. With a USD 163 spread between listings, a little shopping around turns this from an expensive upgrade into a smart one. The portable score of 19.3 is puzzling, but it doesn't reflect the real-world experience of using this drive in a handheld.