Choose based on your handheld’s exact model: an M.2 SSD is internal storage, while a microSD card is removable expansion that works only if the device has a compatible reader. A card is the simpler way to add removable space; an SSD upgrade may suit someone seeking more internal storage who is comfortable checking fit and the device’s upgrade process. There is no universal capacity limit or speed advantage that applies to every handheld.
What’s the difference between an M.2 SSD and a microSD card?
- M.2 SSD: Internal storage, either installed by the manufacturer or upgraded if the handheld’s design and documentation permit it. Fit depends on the supported M.2 length, interface, and physical clearance.
- microSD card: Removable expansion inserted into a built-in card reader. Compatibility depends on the reader, supported card interface and formats, and any device capacity limit.
These are different storage routes, not interchangeable parts. An M.2 SSD cannot be added through a microSD slot, and a microSD card does not replace an internal SSD.
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Which option should you choose?
| Decision | M.2 SSD | microSD card |
|---|---|---|
| Best suited to | More internal storage, if the device supports an upgrade and you verify fit and installation requirements. | Convenient, removable expansion on a handheld with a compatible reader. |
| Check before buying | Exact model, M.2 length, interface, clearance, and upgrade instructions. | Reader presence, supported card type and interface, and the device’s capacity limit. |
| Installation | Requires access to the device; the process depends on the model. | Insert the card and complete any device-specific setup or formatting. |
| Comparative performance | Not established by the official specifications cited here. | Not established by the official specifications cited here. |
The official specifications below identify interfaces and configurations, but do not provide controlled, side-by-side read/write or game-loading tests. They therefore cannot support a specific speed ratio or promise of shorter loading times.
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Steam Deck OLED
Valve lists 512GB and 1TB NVMe SSD configurations. Its microSD reader is UHS-I and supports SD, SDXC, and SDHC. These specifications apply to the OLED model, not automatically to other handhelds. Valve’s Steam Deck OLED specifications also note that product specifications can change.
#1 Best Overall
- PCIe 4.0 Performance: Delivers up to 7,100 MB/s read and 6,000 MB/s write speeds for quicker game load times, bootups, and smooth multitasking
- Spacious 2TB SSD: Provides space for AAA games, apps, and media with standard Gen4 NVMe performance for casual gamers and home users
- Broad Compatibility: Works seamlessly with laptops, desktops, and select gaming consoles including ROG Ally X, Lenovo Legion Go, and AYANEO Kun. Also backward compatible with PCIe Gen3 systems for flexible upgrades
- Better Productivity: Up to 2x faster than previous Gen3 generation. Improve performance for real world tasks like booting Windows, starting applications like Adobe Photoshop and Illustrator, and working in applications like Microsoft Excel and PowerPoint
- Trusted Micron Quality: Built with advanced G8 NAND and thermal control for reliable Gen4 performance trusted by gamers and home users
Steam Deck LCD
Valve’s LCD specifications list 64GB, 256GB, and 512GB models, each with a microSD slot. The reader supports UHS-I, SD, SDXC, and SDHC. The page says some models are available while supplies last, so do not treat the LCD configurations as interchangeable with OLED configurations. Valve’s Steam Deck specifications provide the LCD details.
Lenovo Legion Go 2
Lenovo’s user guide lists one M.2 SSD slot supporting 2242 or 2280 drives over PCIe Gen4, alongside a UHS-II microSD reader. Confirm the specifications for your exact device and configuration in the Legion Go 2 user guide.
Rank #2
- PCIe 4.0 Performance: Delivers up to 7,100 MB/s read and 6,000 MB/s write speeds for quicker game load times, bootups, and smooth multitasking
- Spacious 1TB SSD: Provides space for AAA games, apps, and media with standard Gen4 NVMe performance for casual gamers and home users
- Broad Compatibility: Works seamlessly with laptops, desktops, and select gaming consoles including ROG Ally X, Lenovo Legion Go, and AYANEO Kun. Also backward compatible with PCIe Gen3 systems for flexible upgrades
- Better Productivity: Up to 2x faster than previous Gen3 generation. Improve performance for real world tasks like booting Windows, starting applications like Adobe Photoshop and Illustrator, and working in applications like Microsoft Excel and PowerPoint
- Trusted Micron Quality: Built with advanced G8 NAND and thermal control for reliable Gen4 performance trusted by gamers and home users
Legion Go, Powered by SteamOS (8.8-inch, Gen 2)
Lenovo’s announcement lists up to 2TB of internal M.2 2242 PCIe Gen4 SSD storage and up to 2TB of additional microSD capacity for this named edition. Those figures are not universal limits for Legion Go devices or other handhelds. Check Lenovo’s announcement and current local specifications for this particular model.
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How to format a microSD card on Steam Deck
- Insert the microSD card into the Steam Deck.
- Open Steam > Settings > System > Format SD card.
- Follow the on-screen prompts to format it.
This is the workflow documented by Steam Support for Steam Deck. Do not assume another handheld uses the same menus or process.
Quick Recap
Best Value
- This product has been replaced by our latest generation. Please search for the SANDISK Optimus GX 7100X SSD for ROG XBOX Ally (X) and PC.
- OFFICIALLY XBOX LICENSED. Your drive is officially licensed for Xbox gaming, so you can upgrade your internal storage to store and play more on your ROG Xbox Ally, ROG Xbox Ally X and PC.
- HIGH-OCTANE GAMING. Experience speeds up to 7,250MB/s(2) read and 6,900MB/s(2) write (2TB(1) model), with up to 35% faster performance than previous generation.(4)
- ADD FAVORITES AND NEW TITLES. Available in multiple capacities up to 4TB,(1) so you have tons of storage for your favorite games and the ones you’re looking forward to. CLEAR THAT CHECKPOINT. Built with laptops and handheld gaming devices in mind, with up to 90% more power efficiency over the previous generation.(4)
- 1 MONTH XBOX GAME PASS ULTIMATE. Play new games on day one. Enjoy hundreds of high-quality games on console, PC, and cloud. Get EA Play. Dive into legendary franchises. Play together with friends.(3)
Rank #4
- PCIe 4.0 Performance: Delivers up to 6,600 MB/s read and 5,000 MB/s write speeds for quicker game load times, bootups, and smooth multitasking
- Spacious 500GB SSD: Provides space for AAA games, apps, and media with standard Gen4 NVMe performance for casual gamers and home users
- Broad Compatibility: Works seamlessly with laptops, desktops, and select gaming consoles including ROG Ally X, Lenovo Legion Go, and AYANEO Kun. Also backward compatible with PCIe Gen3 systems for flexible upgrades
- Better Productivity: Up to 2x faster than previous Gen3 generation. Improve performance for real world tasks like booting Windows, starting applications like Adobe Photoshop and Illustrator, and working in applications like Microsoft Excel and PowerPoint
- Trusted Micron Quality: Built with advanced G8 NAND and thermal control for reliable Gen4 performance trusted by gamers and home users
Rank #3
- Ideal for high speed, low power storage
- Gen 4x4 NVMe PCle performance
- Up to 6,000MB/s read, 4,000MB/s write
- Includes Acronis cloning software
- 5-year limited warranty
A quick checklist before buying
- Identify the exact handheld model and edition; similarly named models can have different storage specifications.
- For an SSD, verify M.2 length, interface, clearance, and the device’s upgrade instructions.
- For a microSD card, confirm the device has a reader and check its supported card type, interface, and capacity limit.
- Use manufacturer specifications for that model rather than assuming another device’s maximum capacity or interface applies.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
