writing large file is OK; but error in reading back

[djsg]

Hi,

I followed your tutorial https://embetronicx.com/tutorials/microcontrollers/stm32/stm32-sd-card-interfacing-with-example/ to have made FatFs library work on my STM32 F411 PCB board.
Basically I need to store 1000+ floating point values in SD card and read them back.
I have no problem in writing; but I cannot read all the records back.
I put each value in one line, ending with "\n" and use f_gets to read line by line.
After reading 900+ line, I have Assertion failed error.

Do you have any idea what goes wrong?