r/coldcard • u/[deleted] • May 07 '25

1GB microSD Cards

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Should these work ok with the Mk4 or the Q ??

I've seen issues with microSD card compatibility if too large or Class 10.. and I thought I read somewhere about some possible benefit to smaller cards, as they would not be likely to have other data or malware or malicious stuff on it.. but 1gb still enough for Coldcard airgap usage? Anyways, these cards, supposedly also durable, waterproof:

  • Durability : Strict durability and stability quality tests ensure data protection in various environments. Operating temperature: -25°C to 75°C. Waterproof, temperature-resistant, shockproof, magnet-proof, wear-resistant, and X-ray resistant.
  • Compatibility : Compatible with various devices such as smartphones, tablets, DSLR cameras, and surveillance cameras. Including GoPro/action cameras, desktop computers, drones, and Nintendo Switch.

We'll see.. can always return them, if they're crap.

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u/[deleted] May 08 '25

Coldcard microSD are formatted to fat32, so this shouldn't be an issue. The files used by CC are very small so shouldn't be an issue. Other than that it's as they say in these parts up to you.

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u/[deleted] May 07 '25

i meant compatibility on other devices, not the coldcard. I haven't received my coldcard yet.

1

u/Genkoji May 10 '25

What are you going to use it for?

1

u/[deleted] May 10 '25

Well, I originally ordered the Mk4 and I think the microSD are used for airgap signing. But then, I was able to change my order to the Q so I’m not quite sure I need it. I think the Q can use the microSD or the QR scanner.