e4fae0c4_SI_Miniport_Driver___Black_God__Description
[Notification Type] BusChangeDetected [Description] 
Indicates that a target device might have been added or removed from a dynamic bus. If this value is set, ScsiPortNotification requires an additional parameter: the path ID of the bus on which the change was detected. After this notification, the port driver reenumerates the bus by issuing INQUIRY commands. Bus enumeration is time-consuming and ties up the bus, so a miniport driver should not send this notification unnecessarily.
Notes on Windows SCSI Miniport Driver | Black God
Description