The Switch 2 uses a microSD UHS-II card, and you need at least 128 GB to avoid constant storage warnings

Nintendo Switch 2 requires a microSD UHS-II card — not the older microSD or microSDHC cards that work with the original Switch. The console has 64 GB of built-in storage, but games take up 10 to 50 GB each, so you will run out of space after two or three titles. A 128 GB card is the practical minimum; 256 GB or 512 GB gives you room to keep 10 to 20 games installed without deleting and re-downloading.

The Switch 2 reads microSD UHS-II cards at faster speeds than the original Switch, which matters because large games load noticeably slower from a slow card. A card rated for at least 90 MB/s read speed will perform well. Cards rated for 150+ MB/s read speed are faster but cost more; the difference is noticeable only if you load very large games repeatedly.

You do not need to buy a Nintendo-branded card. Any microSD UHS-II card from a major manufacturer — SanDisk, Kingston, Samsung, Crucial — works the same way. The Nintendo-branded cards are the same product with Nintendo's logo, sold at a higher price.

Key Takeaways

  • Switch 2 requires microSD UHS-II cards; older microSD or microSDHC cards will not work.
  • A 128 GB card is the minimum practical size; 256 GB or 512 GB is more comfortable if you keep multiple games installed.
  • Look for cards rated 90 MB/s read speed or faster to avoid slow load times on large games.
  • SanDisk, Kingston, Samsung, and Crucial cards work identically to Nintendo-branded cards and usually cost less.
  • Avoid counterfeit cards by buying from major retailers like Amazon, Best Buy, or Walmart rather than third-party sellers.

How to check if a card is microSD UHS-II

The packaging or product listing will say "microSD UHS-II" or "microSDXC UHS-II". If it only says "microSD" or "microSDHC", it is too old and will not work with Switch 2. The card itself has a small label on the back; UHS-II cards have a second row of pins below the main row, which older cards do not have.

When you search online, filter by "UHS-II" or "V90" (a speed rating that guarantees sustained write performance). Both terms mean the card meets Switch 2's requirements. Do not buy cards labeled only "UHS-I" — they are slower and cheaper, but the Switch 2 will not read them at full speed.

Storage size: what fits and what does not

A 128 GB card holds roughly 8 to 12 games, depending on their size. Smaller games like Mario Kart 8 take 5 to 10 GB; larger ones like The Legend of Zelda: Breath of the Wild take 15 to 20 GB. If you play a rotating set of games and do not mind re-downloading occasionally, 128 GB is enough. If you want to keep 15 to 20 games installed at once, a 256 GB card is more practical.

A 512 GB card is overkill for most people — it costs significantly more and you will likely upgrade your console before you fill it. A 256 GB card is the sweet spot for people who like to keep a library of games ready to play without waiting for downloads.

The Switch 2 will show a storage warning when you have less than 1 GB free. You do not need to panic at this point, but it means you should delete a game or two soon. The console will not prevent you from playing games when storage is full, but it will not let you read new ones until you free up space.

Read speed and why it matters

A card's read speed is measured in MB/s (megabytes per second). The Switch 2 can read at up to 312 MB/s, but most games do not need that speed. A card rated 90 MB/s is fast enough for smooth gameplay; a card rated 150+ MB/s loads large games slightly faster but costs $10 to $20 more.

The real difference shows up when you are loading into a large open-world game or switching between games quickly. A 90 MB/s card might take 5 to 10 seconds longer to load a massive game than a 150+ MB/s card. For most people, this is not worth the extra cost. If you play games like The Legend of Zelda: Tears of the Kingdom or Starfield constantly and hate waiting, a faster card is worth considering.

Write speed matters less for the Switch 2 because the console does not write large amounts of data to the card during gameplay — it mostly reads. A card rated V90 (which guarantees 90 MB/s sustained write speed) is fine; you do not need to hunt for the fastest write speeds.

Where to buy and how to avoid counterfeits

Buy from major retailers: Amazon, Best Buy, Walmart, Target, or the official Nintendo Store. These sellers verify their inventory and accept returns if a card is defective or counterfeit. Avoid third-party marketplace sellers on Amazon or eBay, even if the price looks good — counterfeit microSD cards are common, and they fail or lose data without warning.

A counterfeit card usually shows up as "fake capacity" — it claims to be 256 GB but actually holds only 32 GB, and it fails after a few weeks. You can test a card after you buy it using free software like H2testw (Windows) or Disk Utility (Mac), which writes test data to the card and reads it back to confirm the real capacity. If you suspect a card is counterfeit, test it before you load games onto it.

Prices vary by retailer and by card brand. A 128 GB SanDisk card typically costs $15 to $25; a 256 GB card costs $25 to $40. Nintendo-branded cards cost 20 to 30 percent more for the same capacity and speed. Watch for sales around major shopping events, but do not buy from unfamiliar sellers just because the price is low.

How to install the card and format it

Power off the Switch 2 completely. Open the microSD card slot on the bottom of the console — it is a small rectangular slot next to the USB-C port. Insert the card at a 45-degree angle until you hear a click, then push gently until it clicks again and sits flush with the console.

Power the console back on. It will detect the card and ask if you want to format it. Say yes. Formatting erases anything on the card and prepares it for the Switch 2; this takes a few seconds. After formatting, the console will show your new total storage in the System Settings menu under Storage.

Do not remove the card while the console is writing to it — this can corrupt the card or the console's file system. If you need to move the card to another Switch 2, power off the first console, remove the card, insert it into the second console, and let it format again. The card will work on both consoles, but each one will have its own copy of your game data.

Frequently Asked Questions

Can I use a microSD card from my original Switch on the Switch 2?

No. The original Switch uses microSD UHS-I cards, and the Switch 2 requires microSD UHS-II. The older card will not fit into the Switch 2's slot. You can keep the old card for your original Switch, but you will need a new UHS-II card for the Switch 2.

What happens if I buy a microSD card that is too slow?

A very slow card (under 60 MB/s) will cause noticeable lag when loading large games, and you may see stuttering during gameplay. The Switch 2 will still work, but the experience is frustrating. Stick to cards rated 90 MB/s or faster to avoid this problem.

Do I need to buy a card right away, or can I wait?

You can wait until you have downloaded a few games and start running low on storage. The console works fine with just the built-in 64 GB for a week or two. Prices for microSD cards do not change much, so there is no rush to buy before a specific date.

Can I use a USB external hard drive instead of a microSD card?

No. The Switch 2 does not support external storage. You must use a microSD UHS-II card inserted into the console itself. This is a hardware limitation, not a setting you can change.

What is the difference between microSDXC and microSD UHS-II?

MicroSDXC refers to the card's capacity (cards over 64 GB are called SDXC). UHS-II refers to the speed standard. A microSD UHS-II card is usually also SDXC because most UHS-II cards are 128 GB or larger. Both terms describe the same card; you need both features for the Switch 2.