Bl. Tan et al., A NEW MR HEAD TRACK FOLLOWING METHOD FOR SUBMICRON TRACK SERVO ON RIGID DISKS, IEEE transactions on magnetics, 30(6), 1994, pp. 4206-4208
An accurate head positioning system uses a magnetoresistive bead to ge
nerate a servo signal from radially magnetised servo patterns on a rig
id disk. The servo patterns are written by a thin film transverse writ
e head and occupies about 6.8% of data area for submicron track servo.
Track following on 0.7 mu m tracks has been demonstrated using the ne
w servo method on longitudinal rigid disks.