ever since f0823886a6 the guess_chs() function adds dummy sectors to the image until it finds a valid CHS mapping, therefore the error can never be triggered (there is no exit condition on the outer loop) (nw)

src/tools/chdman.cpp

@@ -962,9 +962,6 @@ static void guess_chs(std::string *filename, UINT64 filesize, int sectorsize, UI
 						return;
 					}
 			}
-
-	// ack, it didn't work!
-	report_error(1, "Can't guess CHS values because no logical combination works!");
 }