公开(公告)号：GB1277177A

公开(公告)日：1972-06-07

申请号：GB125671

申请日：1971-01-11

Applicant: IBM

Inventor： MCINTOSH ROBERT PAUL ,  PADALINO MARCO

IPC: G11B5/33 ,  G05D3/20 ,  G11B5/127 ,  G11B5/48 ,  G11B5/596

Abstract: 1277177 Magnetic recording and playback INTERNATIONAL BUSINESS MACHINES CORP 11 Jan 1971 [21 Jan 1970] 1256/71 Heading G5R A magnetic transducer 2 has the usual record/playback gap 21 and also a portion 22 sensitive to magnetic flux directed transversely of the gap 21 so as to generate a signal indicative of the intensity of that flux. This signal controls the aligning of the transducer 2 with a data track on a magnetic disc in which a layer of relatively low coercivity carrying the data tracks overlies a layer of relatively high coercivity in which concentric control tracks are magnetized alternately in opposite radial directions so that the boundary between two control tracks underlies the centre line of a data track (Figs. 3 and 4, not shown). The disc may be divided into sectors carrying alternately data and control recordings (Figs. 5 and 6, not shown). The flux-sensitive head portion 22 may exhibit the Hall effect.