  Groisman, Ladyman, Short and Presnell (2007) presented a phenomenological argument in favour of the proposition that all logically irreversible operations are thermodynamically irreversible. In this they were responding in part to Norton's (2005) criticism of the generality of previous proofs of Landauer's principle (including Piechocinska's) and in part to Maroney's (2005) argument that the equality in Piechocinska's proof is reachable, and when reached the heat is generated in a thermodynamically reversible fashion.