This an example of a scored cylinder bore.

This is an example of uneven wear.  The top of the bore appears to have a proper cross hatch pattern.  However, just below the cross hatch has improper wear.

This is an example of a cylinder bore that has pitting.  

This is cylinder has large deposits at the top of the bore.  This is a common occurrence in engines.  This ridge must be removed by a ridge reamer before the piston can be removed.

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There are many types of cross hatch patterns.  Some of the factors that determine the pattern are listed is the diagram.