A data storage medium is introduced. The data storage medium from which
information is reproduced by scanning a surface of the medium with a tip
positioned in contact therewith comprises a recording layer within which
data values are determined by the topographical state at the data item
location. The material of said recording layer comprises a component that
is generating an etchant. The etchant removes the naturally occurring
surface oxide layer of the tip which keeps the tip sharp and works
against tip wear.