Method of writing addresses on a magnetic recording medium
US4151571A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1977 |
| Grant date | Apr 24, 1979 |
| Priority date | — |
| Expiry date | Feb 2, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Binary coded address information is written by a magnetic head on a magnetic recording medium, such as a disc, as a plurality of tracks, each having an address associated with it. Each track includes a reference zone containing a plurality of individual cells equal to the number of bits in the address. Each cell represents a binary value and includes two binary state transitions, each of which can occur at one of only two positions. One transition of each cell in each zone occurs at the same position within the cell, with adjacent zones having alternating positions of this transition. The other transition in the cells in each zone occurs at either position to represent the binary values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.