Function storage_sd_unmount 

pub unsafe extern "C" fn storage_sd_unmount(
    storage: *mut Storage,
) -> FS_Error

Unmount the SD card.

These return values have special meaning:

• FSE_NOT_READY if the SD card is not mounted.
• FSE_DENIED if there are open files on the SD card.

Arguments

• storage - pointer to a storage API instance.

Returns

FSE_OK if the card was successfully formatted, any other error code on failure.