isEmbedded property
True if pyramids are part of the source raster dataset, false otherwise.
Pyramids can be part of the source raster dataset or stored in a separate pyramid file (.ovr). Dataset pyramids may be stored internally by the raster format or in format-managed sidecar files such as .rrd or .aux. In both cases, this property is true.
This property is false only when the pyramid set is stored in a separate pyramid file (.ovr).