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Is it possible a raster TIFF contains uncompressed compressed data as well?

Question asked by Mapping_Solutions on Jun 30, 2017
Latest reply on Jul 13, 2017 by Mapping_Solutions

I have got ortophotos approx in size of 1 TB and just noticed that when I export/copy a raster (114MB disk space) with non compression the result size is 72 MB and then made again an export with jpeg 100% quality compression and the result is 42 MB. In addition, I decompressed the 42MB version and I got 72 MB again. It seems to me (72+42=114) the origin file contains both of compressed uncompressed data. But how?

I tried to check multipage but I didn't find anything. Thank you for the help, very much!