Patterned media magnetic recording disk drive with timing of write pulses by sensing the patterned media
US6754017B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2001 |
| Grant date | Jun 22, 2004 |
| Priority date | — |
| Expiry date | Jul 28, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording disk drive with patterned disk media, wherein discrete magnetic data blocks representative of the individual data bits are isolated from one another, uses the discrete data blocks as the source of the clocking signal to the write head. The carrier for the read/write head includes a special pattern sensor that senses the data blocks in the data tracks before they pass beneath the write head. The pattern sensor output serves as the clocking signal to precisely control the placement of the write pulses by the write head. A time delay is calculated using a timing mark on the patterned disk to delay the write pulses so that a data block sensed by the pattern sensor is the same data block to which the write pulse is applied. In this manner the actual previously recorded data provides the synchronization or clocking signal to control the writing of the new data. The time delay is calculated from measurement of the time for a timing mark to pass from the pattern sensor to the read head and from known spacings of the pattern sensor, read head and write head on the head carrier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.