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Sep 7, 2016 · Fundamentals

Why FatFs Returns FR_NO_FILESYSTEM on a Properly Formatted SD Card – MBR/DBR Insights

An embedded‑system developer discovers that FatFs reports FR_NO_FILESYSTEM on a correctly formatted SD card because the card’s partition information resides in the fourth MBR entry, which FatFs only checks in the first entry, and resolves the issue by re‑formatting with f_mkfs or upgrading to FatFs V0.10.