from usbh_msc.h:93
typedef struct
{
MSC_StateTypeDef state;
MSC_ErrorTypeDef error;
USBH_StatusTypeDef prev_ready_state;
SCSI_CapacityTypeDef capacity;
SCSI_SenseTypeDef sense;
SCSI_StdInquiryDataTypeDef inquiry;
uint8_t state_changed;
}
MSC_LUNTypeDef;