| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a glass substrate for a magnetic recording medium which can stably read servo information including Track information stored on a magnetic disk when the glass substrate is used for an HDD. <P>SOLUTION: With regard to a glass substrate 1 according to the present invention, a value of an amendment concentricity AC that has taken into consideration Sk and/or Ku calculated from a shape profile over the whole circumference of an inside hole, or the skewness is within a predetermined range. <P>COPYRIGHT: (C)2013,JPO&INPIT |
