Filter driver with MO disk

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disk

driver

Hi, I am newbies in driver programmer

I would like to create driver filter on the Mo (Magneto-Optical Disk) device.
Now, I can detect device plugin via DriverObject->DriverExtension->AddDevice

Code:

NTSTATUS DriverEntry (PDRIVER_OBJECT DriverObject, PUNICODE_STRING RegistryPath)
{
	DriverObject->DriverExtension->AddDevice = DriverAddDevice;

	for (i = 0; i <= IRP_MJ_MAXIMUM_FUNCTION; ++i)
	{
		DriverObject->MajorFunction[i] = DispatchQueueIRP;
	}

	DriverObject->DriverUnload =  UnloadDriver;
	return  CreateRootDeviceObject (DriverObject);
}

I would like to detect the event for remove media or exchange a new media(MO disk).
What is IRP_MJ ? i choose handleing.

Thank you.