unkown IoControlCode == 0x4144c

Hi
I’m developing a ScsiPort driver.
I receive a device control request IRP with IoControlCode == 0x4144c.

Device:CONTROLLER (0x4)
Function:0x513 <=What`s this?
Access:FILE_ANY_ACCESS
Method:METHOD_BUFFERED

I tried to find it from NTDDK\inc*.h ,
But I can’t.

Does anybody knows what code is it?