| abstract |
The device is made in the form of a disc with a hole (1a) for a drive shaft, and with a data signal region (A) and a servo signal region (B) (5) produced as concentric circles to correspond with the swinging movement of the magnetic head (H) and its drive (10b). The device has a non-magnetic substrate (2), produced from a silicon wafer, and an aluminium wafer covered by NiP, and a magnetic recording layer (3) made of a hard magnetic material, protected by a covering layer (4). |