The MMC HAT (Hardware Attached on Top) adds a second microSD socket. Can be used on Raspberry Pi A+, B+, Zero (with headers), Zero W* (with headers), 2B, 3B*, 3B+* and 4B. The Raspberry Pi 4 has th...Read More…
The MMC HAT (Hardware Attached on Top) adds a second microSD socket.
Can be used on Raspberry Pi A+, B+, Zero (with headers), Zero W* (with headers), 2B, 3B*, 3B+* and 4B.
The Raspberry Pi 4 has three SD controllers so you can use onboard SD, WiFi and the MMC HAT (SD) at the same time on the Pi4!
When using a Pi4 (or Pi3 where you might want to use it in a Pi4 at a later date) please add the following three lines to the TOP of the config.txt file in the boot directory.
Examples of what you can use your MMC HAT for are.
With the standard SD clock speed a micro SD card in the MMC HAT (/dev/mmcblk2) performs at similar speeds to the onboard micro SD card (/dev/mmcblk0).
The standard MMC HAT package contains:
(* When used on a Raspberry Pi Zero W, 3B or 3B+ the on-board WiFi is disabled as it is on the SDIO interface used by the MMC HAT).
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