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Max Official Capacity: 1TB (Tested up to 1TB)
Setup / Formatting: Flashed via Raspberry Pi Imager (FAT32 boot + ext4)
Minimum Speed Class: A2 App Performance (or U3)
Technical Note: Random 4K read/write IOPS (A2 rating) and wear-leveling matter far more than sequential speed when running an OS from a microSD card.
📋 Official Spec / Manual Source: Raspberry Pi Official Documentation — Recommended SD Card Specs ↗
Need help formatting or fixing an error? See our guides for Windows 10/11, Mac, Dashcam/Camera Card Error Fix, or Garmin Card Degraded Fix.
Get a 64GB or 128GB SanDisk High Endurance or SanDisk Extreme (A2) microSD card. Home Assistant Green / Yellow & Raspberry Pi Server uses a microSD Card (A2 App Class or High Endurance) rated A2 App Performance (or U3). Because Raspberry Pi and Home Assistant write constant system logs 24/7, cheap cards corrupt quickly. Pick an Endurance card (for 24/7 servers) or SanDisk Extreme A2 (for fast desktop/RetroPie boot).
The official maximum supported capacity for Home Assistant Green / Yellow & Raspberry Pi Server is 1TB (tested up to 1TB). For the best balance of price and reliability, our recommended sweet-spot size is 128GB.
64GB ≈ Ideal for Raspberry Pi OS, Home Assistant & OctoPrint • 128GB–256GB ≈ Ideal for RetroPie & media servers. Choosing 128GB gives plenty of headroom without overpaying.
Avoid non-endurance budget cards for 24/7 Home Assistant or OctoPrint setups—database logs will wear them out. Random 4K read/write IOPS (A2 rating) and wear-leveling matter far more than sequential speed when running an OS from a microSD card.
Setup requirement: Flashed via Raspberry Pi Imager (FAT32 boot + ext4). Insert the card into your device. Most modern devices will recognize exFAT automatically without requiring manual formatting.
Yes. Unbranded or counterfeit marketplace cards frequently spoof their capacity or fail to sustain A2 App Performance (or U3) write speeds, leading to corrupted recordings or 'Card Error' warnings. Stick to genuine, branded cards from a reputable retailer to ensure full manufacturer warranty coverage.
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