Thank you very much! you are right. my Problems have been resolved.

Thank to you for your answer.when I check all my use functions,but nothing that destroy IO4.The accessory is my code。

Name: SA08G Type: SDHC/SDXC Speed: default speed Size: 7386MB CSD: ver=1, sector_size=512, capacity=15126528 read_bl_len=9 SCR: sd_spec=2, bus_width=5 I (1380) example: Opening file I (1410) example: File written I (1420) example: Rena웫file I (1420) example: Reading file I (1420) example: Read from ...

I want to use esp32 drive sd for fatfs,but when i use fopen and fgets function at different source file.these are some error……
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