Internal SSD Slot: The Facts#
| Question | Answer | Source |
|---|---|---|
| Slot type | Single M.2, PCIe 4.0 NVMe | Valve specs / launch reviews |
| Form factors that fit | 2230 and 2280 only — the board has standoff points at 30 mm and 80 mm, nothing for 2242/2260 | iFixit teardown |
| Standoff for 2280 | Included with the machine | launch reviews (Club386, Lexar) |
| Stock drive | 512 GB or 2 TB NVMe (2230), model varies | Valve specs |
| User-replaceable? | Yes — storage is officially expandable by the user | Valve / Wikipedia |
| Second drive slot? | No — one slot; upgrading means replacing the stock drive | iFixit teardown |
| Heatsink needed? | No — the stock drive is bare; tall PS5-style heatsinks are a PS5 requirement, not a Steam Machine one | — |
| Largest confirmed capacity | 4 TB (Kingston Fury Renegade 4 TB shown running) | community testing |
The swap is documented — by the people who should document it#
We don't write teardown instructions; the official sources already exist, and they're good:
- The physical swap is covered step-by-step, with photos, in the iFixit M.2 SSD Replacement guide.
- After any drive change, SteamOS must be reinstalled from Valve's official recovery image — SteamOS Recovery at Steam Support. There is no data migration: plan on signing in and re-downloading your library.
What the job takes, per iFixit's tool list: a T8 Torx bit, a spudger (or any slim flat object), and a USB stick flashed with the SteamOS recovery image.
microSD Slot: The Facts#
| Question | Answer | Source |
|---|---|---|
| Slot standard | UHS-I — same class as the Steam Deck's | Valve specs |
| Real-world speed ceiling | ~100 MB/s, regardless of what the card is rated for | UHS-I bus limit |
| microSD Express cards (rated 800–900 MB/s) | Work, but run at UHS-I speed — the premium is wasted here | SD spec |
| V90 / UHS-II cards | Same story — no benefit over a good UHS-I card | SD spec |
| What actually matters | A reliable UHS-I card with A2 app-class rating and honest capacity | — |
| Max capacity | SDXC cards up to 2 TB are within spec | SD spec |
| Can games run from it? | Yes — SteamOS installs and runs games from microSD, at slower load times than the NVMe | Valve |
Rule of thumb: the microSD slot is for library overflow — older, smaller, or less-often-played games. Anything you play daily belongs on the NVMe.
FAQ#
Do I need a PS5-style heatsink drive? No. That's a PS5 requirement. The Steam Machine wants a plain bare NVMe; a chunky heatsink may not physically fit.
Will a 2242 or 2260 drive fit? No. The board only has mount points at 30 mm (2230) and 80 mm (2280).
Can I add a second SSD instead of replacing the stock one? No — there's a single M.2 slot. Your options are: replace the internal drive, or expand via microSD.
Is the 512 GB model worth upgrading? That's a buying question, not a compatibility one — see Best SSDs for the Steam Machine.
Sources#
- Valve — Steam Machine official page
- iFixit — Steam Machine (2nd Generation) device page and M.2 SSD replacement guide
- Steam Support — SteamOS Recovery
- Wikipedia — Steam Machine (2026)
Last verified: July 25, 2026. This page is maintained as a living reference — corrections and newly confirmed drives are folded in as they're verified.