Method for Positioning a Read/Write Head on a Desired Track
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
In the present method for positioning a read/write head on a desired track, a first correction operation is conducted by using a predetermined equation stored in a disk drive; if the first correction value is larger than a predetermined value a second correction operation is conducted by using a new equation. The read/write head can be positioned precisely onto the centerline of the desired track by up to two correction operations. As shown in Fig. 1, the read/write head reads servo data A and servo data B once per revolution which are written on either side of a desired track. The disk drive generates a PES (position error signal) A-B/A+B from servo data A and B. The PES is proportional to off track x from the desired track.