How can I know whether a disk is inserted to the usb host on 6748 evm

Dear senior engineer:

    My development hardware is the 6748 evm. I am using biosusb by rtfs to access the usb host. I need a function that can check whether a disk is inserted to the usb host as soon as possible. From the rtfs example I am using the function "getdriveid" to check the usb host state, the code is:

	int i = 0;
	int ret;
	do
	{
		ret = getdriveid( BFS_DEVICE_TYPE_USB, 0, 0, gUDiskDriverId );
		if( ret != -1 )
		{
			printf( "USB: %s getdriveid success\n", gUDiskDriverId );
			TSK_sleep( 10 );
			return true;
		}
		else
		{
			TSK_sleep( 10 );
		}
	} while( ++i < 200 );

   This code can work correctly, but when there is no disk in usb host, the code will take a long time for time out. Is there a fast way to check the usb host state even there is no 

disk in usb host. 

  Thanks a lot.