ardupilot/libraries/AP_HAL_F4Light/hardware/sd/README.md

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SD card layer
works via HAL SPI so should be at this level
Much faster than old version and supports much more formats
based on:
* Arduino's SD support for STM32F4 (fixed bugs in read() with data size, in open() with "mode==" and so on, twice reduced memory usage and cured Arduinism)
* FatFs SDIO for STM32F1
uses FatFS (c) Chan
formatting from command-line:
mkfs.fat -I -F 12 -M 0xF9 -s 128 /dev/sd*