Hard disk drive

Abstract

A magnetic disk to which is applied a first lubricating agent formed as (where p=0 or an integer of at least 1, q=0 or an integer of at least 1, and X=1-5), and over which is applied a second lubricating agent formed as HOCH 2 CF 2 (OC 2 F 4 ) p (OCF 2 ) q OCF 2 CH 2 OH (where p=0 or an integer of at least 1, q=0 or an integer of at least 1.

1 . A magnetic disk to which is applied a first lubricating agent formed as  
       
         
           
           
               
               
           
         
         (where p=0 or an integer of at least 1, q=0 or an integer of at least 1, and X=1-5), and over which is applied a second lubricating agent formed as  
           HOCH 2 CF 2 (OC 2 F 4 ) p (OCF 2 ) q OCF 2 CH 2 OH  
         (where p=0 or an integer of at least 1, q=0 or an integer of at least 1).  
       
     
     
         2 . A magnetic disk as described in  claim 1  wherein an average molecular weight of the second lubricating agent is no more than 2,400 and no less than 600.  
     
     
         3 . A magnetic disk as described in  claim 1  wherein a proportion of the second lubricating agent is less than that of the first lubricating agent.  
     
     
         4 . A magnetic disk as described in  claim 1  wherein the first lubricating agent is applied with a thickness in a range of approximately 1.0-1.8 nm.  
     
     
         5 . A magnetic disk as described in  claim 1  wherein the average molecular weight of the first lubricating agent is roughly in a range of 1,500-6,500.  
     
     
         6 . A magnetic disk as described in  claim 1  wherein the average molecular weight of the first lubricating agent is roughly in a range of 3,500-6,500.  
     
     
         7 . A magnetic disk as described in  claim 1  wherein the magnetic disk is formed by stacking a glass substrate, a seed layer, a base layer, a lower magnetic layer, a non-magnetic intermediate layer, an upper magnetic layer, and a protective layer.  
     
     
         8 . A magnetic disk to which is applied a first lubricating agent formed as  
       
         
           
           
               
               
           
         
         (where p=0 or an integer of at least 1, q=0 or an integer of at least 1,  
         
           
             
             
                 
                 
             
           
         
         (where p=0 or an integer of at least 1, q=0 or an integer of at least 1.  
       
     
     
         9 . A magnetic disk as described in  claim 8  wherein an average molecular weight of the second lubricating agent is no more than 2,400 and no less than 600.  
     
     
         10 . A magnetic disk as described in  claim 8  wherein a proportion of the second lubricating agent is less than that of the first lubricating agent.  
     
     
         11 . A magnetic disk as described in  claim 8  wherein the first lubricating agent is applied with a thickness in a range of approximately 1.0-1.8 nm,  
     
     
         12 . A magnetic disk as described in  claim 8  wherein the average molecular weight of the first lubricating agent is roughly in a range of 1,500-6,500.  
     
     
         13 . A magnetic disk as described in  claim 8  wherein the average molecular weight of the first lubricating agent is roughly in a range of 3,500-6,500.  
     
     
         14 . A magnetic disk as described in  claim 8  wherein the magnetic disk is formed by stacking a glass substrate, a seed layer, a base layer, a lower magnetic layer, a non-magnetic intermediate layer, an upper magnetic layer, and a protective layer.