DATA REWRITING METHOD AND DEVICE

• Main Author: RYU, KEE-WOONG
• Format: Patent
• Language: English
• Published: 15.06.2000
• Edition: 7
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

PURPOSE: A method and apparatus for re-recording data is provided to record data again by searching a bit position generating an error if an error is generated while CD data are recorded. CONSTITUTION: An optical pickup device(2) records data by scanning a laser light on a CD(1) or reads previously recorded data(EFM data). An EFM edge signal generator(3) scans the data(EFM data) being reproduced and outputted from a CD(1) by the optical pickup device(2) and outputs an edge detecting signal thereof. A 12_T detecting unit(4) detects whether the data are outputted in a predetermined time(12_T) in the optical pickup device(2), and outputs an EFM counter hold signal(EFM CHS) if the data are not outputted. An EFM counter(5) is reset by a sub code synchronizing signal(Sub-Sync), and counts an edge detecting signal(ED), and becomes the count hold by the EFM counter hold signal(EFM CHS) in a recording error detecting point, and stores the current counter value. A digital signal processing unit(6) generates the sub code synchronizing signal(Sub-Sync) based on the data(EFM data). A micro computer(7) senses a portion generating a recording error based on the EFM counter hold signal(EFM CHS) and the value held in the EFM counter(5), and records data again on the corresponding area by controlling the optical pickup device(2).