IOCTL_STORAGE_GET_MEDIA_SERIAL_NUMBER control code
Queries the USB generic parent driver for the serial number of a USB device. If a USB device has a CSM-1 content security interface, a USB client driver can query for its serial number using this request. USB client drivers that help implement a digital rights management (DRM) system can use this information to ensure that only legitimate customers have access to digitized intellectual property.
Parameters.DeviceIoControl.OutputBufferLength in the I/O stack location of the IRP indicates the size, in bytes, of the buffer, which must be at least sizeof(MEDIA_SERIAL_NUMBER_DATA).
The driver returns the serial number of the indicated device in a structure of type MEDIA_SERIAL_NUMBER_DATA in the buffer at Irp->AssociatedIrp.SystemBuffer.
The Information field is set to the size, in bytes, of the returned data. The Status field can be set to STATUS_SUCCESS, or possibly to STATUS_INVALID_BUFFER_SIZE or STATUS_INSUFFICIENT_RESOURCES.