Data recording/reproducing device

Claim 1

A method for recording information on a recording medium, the medium having a plurality of tracks, each track including a plurality of sectors, each sector having a preformatted area onto which an address is recorded and a data area, wherein a first synchronization (sync) signal is stored in the data area at the head of coded data in the form of a status transition pattern comprising the steps of: converting a first information train to be recorded into a code train in the form of a run-length-limited code in accordance with a predetermined conversion rule; inserting a second sync signal in said code train at regular intervals to provide a second information train constituted by the combination of the code train and said second sync signal; physically forming a status transition pattern on the recording medium so that leading edges and trailing edges in said status transition pattern correspond to information in said second information train; and wherein said second sync signal, comprises a coded signal pattern not found in said predetermined conversion rule and is distinguishable from said code train and wherein said run-length-limited code is a 2-7 (two-to-seven) code, and said second sync signal is selected from a group of code trains consisting of a. "10000000100000001001001"; and b. "10000000010000001001001".

Claim 2

A method for recording information on a recording medium, the medium having a plurality of tracks, each track including a plurality of sectors, each sector having a preformatted area onto which an address is recorded and a data area, wherein a first synchronization (sync) signal is stored in the data area at the head of coded data in the form of a status transition pattern comprising the steps of: converting a first information train to be recorded into a code train in the form of a run-length-limited code in accordance with a predetermined conversion rule; inserting a second sync signal in said code train at regular intervals to provide a second information train constituted by the combination of the code train and said second sync signal; physically forming a status transition pattern on the recording medium so that leading edges and trailing edges in said status transition pattern correspond to information in said second information train; and wherein said second sync signal, comprises a coded signal pattern not found in said predetermined conversion rule and is distinguishable from said code train and wherein said run-length-limited code is a 2-7 (two-to-seven) code, and said second sync signal is selected from a group of code trains consisting of a. "10000000100000001001001"; and b. "10000000010000001001001".

Claim 3

A method for recording/reproducing information on a disk comprising the steps of: rotating the disk at a fixed speed, said disk comprising a large number of tracks formed thereon, each of said tracks divided into a plurality of sectors, each of said sectors comprising a preformatted area and a data area; converting the information to be recorded on a sector on the disk into a first code train in accordance with a predetermined conversion rule; forming a sync signal comprising a pattern not existing in said predetermined conversion rule; inserting said sync signal at regular intervals in said first code train to provide a second code train; NRZI-converting said second code train; driving a head in accordance with said NRZI converted signal to form a physical pattern consisting of successive pits indicative of converted second code train on the data area of one of the plurality of sectors; reproducing the information, wherein said sync signal inserted in said second code train is used for resynchronization in reproducing the information: wherein said run-length-limited code is a 2-7 (two to seven) code, and said sync signal is selected from the group consisting of the code trains a. "10000000100000001001001"; and b. "10000000010000001001001".

Claim 4

A method for recording/reproducing information on a disk comprising the steps of: rotating the disk at a fixed speed, said disk comprising a large number of tracks formed thereon, each of said tracks divided into a plurality of sectors, each of said sectors comprising a preformatted area and a data area; converting the information to be recorded on a sector on the disk into a first code train in accordance with a predetermined conversion rule; forming a sync signal comprising a pattern not existing in said predetermined conversion rule; inserting said sync signal at regular intervals in said first code train to provide a second code train; NRZI-converting said second code train; driving a head in accordance with said NRZI converted signal to form a physical pattern consisting of successive pits indicative of converted second code train on the data area of one of the plurality of sectors; reproducing the information, wherein said sync signal inserted in said second code train is used for resynchronization in reproducing the information: wherein said run-length-limited code is a 2-7 (two to seven) code, and said sync signal is selected from the group consisting of the code trains a. "10000000100000001001001"; and b. "10000000010000001001001".