The easiest way to end the "storage full" dance on a Steam Deck, ROG Ally or MSI Claw is to swap the internal drive — but there's one detail that decides whether the SSD you order even fits: these handhelds take the small M.2 2230 size, not the full-length 2280 that goes in a desktop or the new Steam Machine. Get that right and the upgrade is a ten-minute job. All three picks here are true 2230 drives sized for a real game library: the WD_BLACK SN770M is our best overall, the Corsair MP600 Mini is the fastest for the money, and the Sabrent Rocket 2230 is the best budget buy.
One number trips people up, so let's kill it first: the 2230 vs 2280 thing. 2230 is 30mm long; 2280 is 80mm. The Steam Deck (LCD and OLED), ROG Ally and Ally X, Legion Go and the MSI Claw 8 AI+ all use 2230. A 2280 drive physically will not fit, and a 2230 drive in a 2280 slot needs an adapter — so match the size to the device before anything else. (The newer Intel Arc handhelds, the Claw 8 EX AI+ and Predator Atlas 8, switched to 2280; for those and the Steam Machine see our best SSDs for the Steam Machine guide instead.)
Who this comparison is for#
- Anyone whose Steam Deck, ROG Ally or MSI Claw 8 AI+ is out of space and wants to replace the internal drive rather than lean on a microSD card.
- Upgraders who want the move done once, with a drive that runs cool and sips power in a sealed handheld.
- People who've been burned by a listing and want to be sure they're buying the right 2230 size and the current, faster revision — not last year's slower one.
How we picked#
- 2230 size, no exceptions. Every pick is a genuine M.2 2230 (30mm) drive. That's the only size these handhelds accept — the single most common upgrade mistake is ordering a 2280 by accident.
- PCIe 4.0 and single-sided. All three are PCIe 4.0 and single-sided, so the chips sit on one face and clear the tight lid and battery inside a handheld. Most 2230 drives are DRAM-less by design and lean on the host's memory (HMB) — normal here, and it keeps power and heat down.
- Cool and power-efficient over headline speed. In a fanless or lightly-cooled handheld, sustained thermals and battery draw matter more than a peak number you'll never hit. We weighted efficiency and steady performance heavily.
- Current revision, real capacity. We flag the traps that cost people money: buying an older, slower revision of the same drive, or chasing a capacity a given model doesn't actually sell.
Product 1 — WD_BLACK SN770M (Best Overall)#
The SN770M is Western Digital's 2230 drive built specifically for handhelds, and it's the one we'd hand most people without a second thought. It's PCIe 4.0 with reads up to about 5,150 MB/s, single-sided, and tuned to stay efficient — WD rates it for the kind of sustained, low-power operation a Steam Deck or ROG Ally actually runs, so it holds performance instead of cooking itself in a sealed shell. You're buying a known quantity with WD_BLACK's gaming pedigree and a five-year warranty behind it.
Just as important, it comes in 1TB and 2TB, so you can size it to your library and be done. It installs the same way in a Steam Deck, ROG Ally or Claw 8 AI+ — one screw, drop it in, reimage SteamOS or Windows — and then you stop thinking about storage. This is the safe, no-second-guessing choice.
Key specs#
Interface : M.2 2230, PCIe 4.0 x4 (NVMe)
Rated read : Up to ~5,150 MB/s
DRAM : DRAM-less (HMB), single-sided
Capacities : 1TB / 2TB
Warranty : 5-year limited
Best for : Anyone who wants the proven, purpose-built handheld drive
Bottom line. WD's handheld-specific 2230 drive: efficient, cool, well-warrantied, and available up to 2TB. The default best-overall pick for a Steam Deck or ROG Ally.
Product 2 — Corsair MP600 Mini (Best Value)#
If you want the most speed per dollar, the MP600 Mini is the pick — but buy carefully, because Corsair sells two different revisions under the same name. The current one is rated up to 7,000 MB/s (3D TLC), noticeably quicker than the older revision that tops out around 4,800 MB/s. They look nearly identical in listings, so check the speed rating before you click buy — you want the 7,000 MB/s version, and it's the one we link below.
Beyond the speed, it's a straightforward 2230, PCIe 4.0, single-sided drive that drops into any of these handhelds. On a bandwidth-limited handheld you won't always see that full 7,000 MB/s, but the faster controller and TLC flash give it more headroom for big installs and stay snappier as the drive fills. For most people this is the sweet spot of price and performance.
Key specs#
Interface : M.2 2230, PCIe 4.0 x4 (NVMe)
Rated read : Up to ~7,000 MB/s (current revision)
Flash : 3D TLC, single-sided
Capacities : 1TB / 2TB
Warranty : 5-year limited
Best for : The best speed-per-dollar — if you buy the current revision
Bottom line. The fastest-rated pick here and a genuine value, with one catch: get the 7,000 MB/s revision, not the older 4,800 MB/s one sold under the same name.
Product 3 — Sabrent Rocket 2230 (Best Budget)#
When you just want more space for the least money, the Sabrent Rocket 2230 is the honest budget pick. It's a PCIe 4.0, single-sided 2230 drive with TLC flash, rated up to roughly 4,750 MB/s — plenty for a handheld where sequential speed isn't the bottleneck, and it installs exactly like the others.
One thing to know before you shop: the standard TLC Rocket 2230 tops out at 1TB. If you see a "2TB Rocket 2230," that's actually the Rocket Q4 2230, a different QLC drive — fine if you want the capacity and accept QLC, but it isn't the same product, so don't buy it expecting TLC. For a 1TB upgrade that keeps the cost down, this is the one.
Key specs#
Interface : M.2 2230, PCIe 4.0 x4 (NVMe)
Rated read : Up to ~4,750 MB/s
Flash : 3D TLC, single-sided
Capacities : 512GB / 1TB (2TB only as the QLC Rocket Q4 2230)
Warranty : Up to 5-year (with registration)
Best for : The cheapest way to a real 1TB upgrade
Bottom line. A solid, no-drama 1TB budget drive. Just don't confuse the 2TB "Rocket 2230" listing with this — that's the QLC Q4 sibling.
Which one should you buy?#
For most people, the WD_BLACK SN770M is the right call: it's built for handhelds, runs cool and efficient, is warrantied for five years, and comes in up to 2TB. If you care most about speed for the money and you're willing to confirm you're getting the current revision, the Corsair MP600 Mini at 7,000 MB/s is the value champion. And if the goal is simply the cheapest honest 1TB, the Sabrent Rocket 2230 does the job.
A quick honorable mention: the Acer MA200 is a newer, well-priced TLC 2230 drive worth a look, but it only goes up to 1TB, so it's out if you want 2TB. Whatever you pick, double-check two things at checkout — that it says 2230, and that you're on the current, faster revision — and your Steam Deck, ROG Ally or Claw 8 AI+ will have room to spare.
FAQ#
Will a 2230 SSD fit my Steam Deck, ROG Ally or MSI Claw? : Yes — the Steam Deck (LCD and OLED), ROG Ally, Ally X, Legion Go and the MSI Claw 8 AI+ all use the M.2 2230 size, which is what every drive here is. The newer Claw 8 EX AI+ and Predator Atlas 8 use the longer 2280 instead, so check your exact model first.
What's the difference between 2230 and 2280? : It's the physical length in millimetres — 2230 is 30mm, 2280 is 80mm. They use the same connector, but an 80mm drive won't fit a 30mm slot. Handhelds take 2230; desktops and the Steam Machine take 2280.
Does a DRAM-less SSD hurt gaming performance? : Not in any way you'll notice on a handheld. These drives use Host Memory Buffer (HMB) instead of onboard DRAM, which keeps power and heat down — exactly what you want in a sealed, battery-powered device — while delivering the same real-world game loading.
Why does the Corsair MP600 Mini have two versions? : Corsair updated the drive to a faster controller and flash without renaming it, so an older ~4,800 MB/s revision and a current ~7,000 MB/s revision both sell as "MP600 Mini." Check the rated speed in the listing and buy the 7,000 MB/s one.
Do I need to reinstall the OS after swapping the drive? : Yes. The new SSD is blank, so you'll reimage SteamOS (via Valve's recovery image) on a Steam Deck, or reinstall Windows on a ROG Ally or Claw. Back up saves to the cloud or a microSD first, and the whole process takes under an hour.