F_MOUNT RETUFN FR_NO_FILESYSTEM stm32f411 usb mass storage class

[Hoang_Tran]

hello everyone.i am a new member.I am trying to read a file in usb memory. When executing F_Mount, it returns FR_NO_FILESYSTEM. If I replace 0, then this function returns FR_OK but then executes F_OPEN. This function returns FR_NO_FILESYSTEM.please help me.thank you very mucg

[Hoang_Tran]

help me

[Tesla DeLorean]

Please don't bump questions in this way, it's awfully presumptive.

So behaviour is consistent the flag causes the mounting to be deferred.

If the media is >=64GB in might well be in EXFAT format and you'll need to enable that in the configuration of FATFS. Also NTFS volumes will not be mounted.

If the underlying read/write functions in the DISKIO layer don't return expected data/blocks then the file system will fail. You should review the data returned during initial mounting to see if it reads the MBR and BPB correctly.