Customized head gimbal assembly bonding skew angle for adjusting two-dimensional magnetic recording reader alignment

Abstract

System and methods are illustrated for customizing the HGA bonding skew angle of a TDMR slider including a plurality of readers to adjust reader alignment relative to a track location on disk media. Overlay error caused by manufacturing variations is compensated for by adjusting the skew angle of the slider when it is bonded to the suspension to form the HGA. Process operations for manufacturing a TMDR HDD include manufacturing a multiple reader, multiple layer TDMR slider, determining an overlay error in the slider, determining a slider bonding skew angle based on the determined overlay error and other parameters, and bonding the slider to a HDD suspension at the determined bonding skew angle.

What is claimed is: 
     
         1 . A hard disk drive, comprising:
 at least one rotatable disk having a disk surface;   a rotary actuator comprising an arm and a suspension mounted on the arm; and   a slider bonded to the suspension at a skew angle, wherein the slider comprises a plurality of readers.   
     
     
         2 . The hard disk drive of  claim 1 , wherein the slider is bonded to the suspension by a skew bin. 
     
     
         3 . The hard disk drive of  claim 1 , wherein the bonding skew angle is based on a first overlay error (OLE) between a first reader and a second reader on the slider. 
     
     
         4 . The hard disk drive of  claim 3 , wherein the first reader is on a first layer of the slider, and wherein the second reader is a on a second layer of the slider. 
     
     
         5 . The hard disk drive of  claim 4 , wherein the bonding skew angle is further based on the longitudinal separation between the first layer and the second layer. 
     
     
         6 . The hard disk drive of  claim 5 , wherein the slider is a two-dimensional magnetic recording (TDMR) slider. 
     
     
         7 . The hard disk drive of  claim 5 , wherein the bonding skew angle is further based on a second OLE between the second reader and a third reader. 
     
     
         8 . The hard disk drive of  claim 7 , wherein the third reader is on the first layer. 
     
     
         9 . The hard disk drive of  claim 7 , wherein the third reader is on a third layer. 
     
     
         10 . The hard disk drive of  claim 4 , wherein the bonding skew angle is further based on the width of each of the plurality of readers.