Magnetic disc apparatus employing constant-density recording and driver access method where a wedge ID field and a pseudo ID field are recorded

A magnetic disc apparatus employing constant-density recording, comprising:

• a plurality of tracks extending in a circumferential direction along a surface of said magnetic disc apparatus;
• a plurality of servo and data information areas provided in the circumferential direction of each one of said plurality of tracks;
• a wedge identification field positioned behind each one of said plurality of servo information areas, for recording first data identifying data sectors located within a corresponding one of said plurality of data information areas;
• a pseudo identification field positioned at a first portion of each one of said data sectors, said pseudo identification field representing an interval accommodating transfer of second data generated from said first data to a controller of said magnetic disc apparatus during access of said magnetic disc apparatus, said second data identifying a corresponding one of said data sectors;
• and
• a data field positioned behind said pseudo identification field, said data field and said pseudo identification field comprising a single one of said data sectors.

A magnetic disc driver for accessing digital information through a read/write channel on a magnetic disc surface employing constant-density recording, said magnetic disc surface having a wedge identification field positioned behind servo information areas for recording first data identifying data sectors in a corresponding data information area;

• a pseudo identification field positioned at a first portion of each one of said data sectors;
• and a data field positioned behind said pseudo identification field, said magnetic disc driver comprising:
• a wedge identification reader for reading said first data through said read/write channel at an ending time of each one of said servo information areas;
• a sector pulse generator for generating a sector pulse indicating a starting position of each one of said data sectors positioned within said corresponding data information area, said sector pulse being generated in response to location information detected in said first data indicating said starting position of each one of said data sectors positioned within said corresponding data information area;
• and
• a pseudo identification generator for generating from said first data, second data to identify a corresponding one of said data sectors, in response to said sector pulse.

A magnetic disc driver for accessing digital information on a magnetic disc surface employing constant-density recording and having a wedge identification field positioned behind servo information areas for recording first data to identify data sectors in a corresponding data information area;

• a pseudo identification field positioned at a first portion of each one of said data sectors;
• and a data field positioned behind said pseudo identification field, said magnetic disc driver comprising:
• a disc data controller for generating, in a read mode, a read gate signal during intervals corresponding to said pseudo identification field and said data field while simultaneously receiving data read from said magnetic disc surface, and in a write mode, for generating said read gate signal during said interval corresponding to said pseudo identification field and a write gate signal during said interval corresponding to said data field while simultaneously outputting write data to be written on said magnetic disc surface, in response to receipt of a sector pulse indicating a starting position of one of said data sectors in said corresponding data information area;
• a read/write channel for detecting data represented as a first analog signal read from said magnetic disc surface to thereby decode and output detected data in response to input of a read gate control signal, and for encoding said write data received from said disc data controller to thereby record said write data as a second analog signal on said magnetic disc surface in response to input of said write gate signal;
• a wedge identification reader for reading said first data from said read/write channel by generating said read gate control signal and applying said read gate control signal to said read/write channel during an interval corresponding to said wedge identification field at an ending time of each one of said servo information areas, for applying said read gate control signal to said read/write channel during said interval corresponding to said data field in dependence upon said read gate signal of said read mode, and for generating a pseudo identification selection signal during said interval corresponding to said pseudo identification field;
• a sector pulse generator for generating said sector pulse from location information in said first data indicating said starting position of said one of said data sectors in said corresponding data information area;
• a pseudo identification generator for generating second data to identify a corresponding data sector from said first data, in response to said sector pulse;
• and
• a selector for selecting said second data in dependence upon said pseudo identification selection signal during said interval corresponding to said pseudo identification field, and for selecting an output of said read/write channel during intervals other than said interval corresponding to said pseudo identification field to thereby apply a selected signal to said disc data controller.

A method for accessing digital information on a magnetic disc surface employing constant-density recording and having a wedge identification field positioned behind servo information areas for recording first data identifying data sectors in a corresponding data information area;

• a pseudo identification field positioned at a first portion of each one of said data sectors;
• and a data field positioned behind said pseudo identification field, said method comprising the steps of:
• reading said first data from said magnetic disc surface during an interval corresponding to said wedge identification field in response to an end of each one of said servo information areas;
• generating a sector pulse from location information in said first data indicating a starting position of each one of said data sectors in said corresponding data information area;
• generating second data from said first data in response to said sector pulse, said second data identifying a corresponding one of said data sectors in said corresponding data information area to be accessed;
• and
• accessing said corresponding one of said data sectors identified by said second data.

A magnetic disc driver for accessing digital information through a read/write channel on a magnetic disc surface employing constant-density recording, said magnetic disc surface having a wedge identification field positioned behind servo information areas for recording first data identifying data sectors in a corresponding data information area;

• a pseudo identification field positioned at a first portion of each one of said data sectors;
• and a data field positioned behind said pseudo identification field, said magnetic disc driver comprising:
• a wedge identification reader for reading said first data through said read/write channel at an ending time of each one of said servo information areas, said wedge identification reader comprising:
• a serial/parallel converter connected to said read/write channel, for converting serial data read from said magnetic disc surface into parallel data;
• an address mark detector for detecting a first identification address mark of said first data from said parallel data;
• wedge identification storage means for serially storing said parallel data corresponding to said first data, in response to detection of said first identification address mark by said address mark detector;
• and
• a timing controller for operating said read/write channel as a read mode during an interval corresponding to said wedge identification field and generating a pseudo identification selection signal during an interval corresponding to said pseudo identification field;
• a sector pulse generator for generating a sector pulse indicating a starting position of each one of said data sectors positioned within said corresponding data information area, said sector pulse being generated in response to location information detected in said first data indicating said starting position of each one of said data sectors positioned within said corresponding data information area;
• and
• a pseudo identification generator for generating from said first data, second data identifying a corresponding one of said data sectors, in response to said sector pulse.