unmount and mount again fail

[m3u8playlist]

The first time it's ok to mount the sd card and read/write files.

 MX_SPI3_Init();
 MX_FATFS_Init();
HAL_Delay(1000);
init_sdcard();

then I remove sd card and insert sd card, use the same code(above) to init sd card. It returns f_mount error (1)

Is there any extra work to do?