Cutting a Parmigiano Reggiano wheel, We start by scoring the entire rind with a knife, then pull a cheese wire through it to cut., By Tenuta's Delicatessen & Liquors
This video on how to cut a Parmigiano Reggiano cheese wheel is very satisfying - Boing Boing
Learning About Parmigiano-Reggiano in Italy
Sendik's Hand-Cut Parmigiano Reggiano, Italian Cheese