usbd sdcard I use the example from sdk15（usb msc）and have some problems

[syc776]

I need to operate sdcard from pc(by usb msc) and from mcu (nordic 52840) (fat32 filesystem) spi sdcard at same time ;

so i have a problem ,when i operate the sd from pc and mcu  have a hardfault err; 

[Turbo J]

Both at the same time is impossible, because they won't "see" each other's changes properly. FatFS only works when it has FULL control over the filesystem - and the PC has the same limitation.

These inconsistencies may or may not be the cause of your hard faults  -impossible to tell without looking at your source code.

[syc776]

Can you help me? Did you read my message?