Data zone lube removal

Abstract

In an embodiment, a magnetic disk comprising a substrate having a non-data zone region and a data zone region and a lubrication layer on the substrate, wherein a portion of the lubrication layer on the non-data zone region has a greater thickness of higher viscosity than a portion of the lubrication layer on the data zone region.

1 . A magnetic disk comprising:
 a substrate surface having a non-data zone region and a data zone region; and   a lubrication layer on the substrate, wherein at least a portion of the lubrication layer on the non-data zone region has a greater thickness and higher viscosity than at least a portion of the lubrication layer on the data zone region.   
     
     
         2 . The magnetic disk of  claim 1 , wherein said at least a portion of the lubrication layer on the data zone region overlies the entirety of the data zone region. 
     
     
         3 . The magnetic disk of  claim 1 , wherein the viscosity of the portion of the lubrication layer on the non-data zone region is increased by polymerization. 
     
     
         4 . The magnetic disk of  claim 1 , wherein viscosity of the lubrication layer on the non-data zone region is increased by exposure to radiation. 
     
     
         5 . The magnetic disk of  claim 1 , wherein the lubrication layer is on both sides of the substrate, and wherein both sides of the substrate comprise the non-data zone region and the data zone region. 
     
     
         6 . The magnetic disk of  claim 1 , wherein a thickness of the lubrication layer on the data zone region is made thinner with a lubrication removal head. 
     
     
         7 . The magnetic disk of  claim 1 , wherein a thickness of the lubrication layer on the data zone region is made thinner with an application of solvent. 
     
     
         8 . The magnetic disk of  claim 1 , wherein the thickness of at least a portion of the lubrication layer on the data zone region is made thinner with a tape pickup. 
     
     
         9 . The magnetic disk of  claim 8 , wherein the tape pickup is cleaned while being used. 
     
     
         10 . The magnetic disk of  claim 1 , wherein at least a portion of the magnetic disk is burnished. 
     
     
         11 . The magnetic disk of  claim 10 , wherein the portion of the magnetic disk burnished comprises the data zone region. 
     
     
         12 . The magnetic disk of  claim 1 , wherein the thickness of the lubrication layer in the data zone region is less than 10 angstroms. 
     
     
         13 . The magnetic disk of  claim 1 , wherein the magnetic disk has substantially a same texturing over the entire surface of the substrate. 
     
     
         14 . The magnetic disk of  claim 1 , wherein a coefficient of friction of the lubrication layer on the data zone region is less than half of a coefficient of friction of the non-data zone region. 
     
     
         15 . A magnetic disk comprising:
 a substrate surface having a non-data zone region and a data zone region;   a first layer of lubrication of substantially equal thickness over the entire substrate surface, wherein the first layer of lubrication is bonded at least to the non-data zone region; and   a second layer of lubrication over at least a portion of the non-data zone region that is less than the entire substrate surface, wherein the first and second layers of lubrication over said at least a portion of the non-data zone has a higher viscosity and greater thickness than the first layer of lubrication in the data zone region.   
     
     
         16 . The magnetic disk of  claim 15 , wherein at least a portion of the first layer of lubrication is removed from the data zone region after the first layer of lubrication is bonded to the said at least a portion of the non-data zone region.