Patent ES-2003371-A6 (ES)
Title: Magnetic read/write head position servo-control apparatus.
Inventor: VINAL ALBERT W
IPC: G11B5/58
Filed: 1986-10-09
Abstract: Vertical magnetic media are those in which the magnetic vector in the medium is oriented perpendicular to the surface of the medium instead of lying laterally or longitudinally in the surface of the medium. There are two servo tracks of essentially constant and opposite magnetic polarity recorded on the vertical magnetic medium for each data channel on the medium. The servo tracks themselves may be segmented into reference zones and control or guard zones and they may be recorded on a dedicated surface of a magnetic medium or on the same surface as the data and interleaved with data tracks. - When the servo tracks are alternated with data tracks on the same surface of the medium, a single read/write head for twin track recordings may be used to simultaneously read servo signals and data signals. When the servo tracks are recorded in a dedicated sector or on another surface of the medium, the data track space between the two servo tracks can contain system control data that is normally included in the data tracks of the main data portion, thus freeing additional space in the data tracks of the main data area for additional data. EPAB- EP-233314 B Magnetic read/write head position servo control apparatus, comprising a vertically polarisable magnetic medium (1) having at least one data track region, and parallel servo tracks (S), at least one twin track magnetic read/write head (4) for writing and reading back signals recorded on said medium, a head positioning drive means (14) connected to said read/write head and servo control means connected to said read/write head and to said head positioning drive means and responsive to readback signals from said servo tracks for operating said head positioning drive means to align said read/write head with said data track said apparatus being characterised in that: said data track region comprises a plurality of data recording tracks (D), and said data recording tracks and said servo tracks are alternated with one another on said recording medium such that each single data track is located between two servo tracks (S) of opposite magnetic polarisation. (23pp) - EP-233314 B Magnetic read/write head position servo control apparatus, comprising a vertically polarisable magnetic medium (1) having at least one data track region, and parallel servo tracks (S), at least one twin track magnetic read/write head (4) for writing and reading back signals recorded on said medium, a head positioning drive means (14) connected to said read/write head and servo control means connected to said read/write head and to said head positioning drive means and responsive to read back signals from said servo tracks for operating said head positioning drive means to align said read/write head with said data track said apparatus being characterised in that: said data track region comprises a plurality of data recording tracks (D), and said data recording tracks and said servo tracks are alternated with one another on said recording medium such that each single data track is located between two servo tracks (S) of opposite magnetic polarisation.