公开(公告)号：DE69420218T2

公开(公告)日：2000-03-23

申请号：DE69420218

申请日：1994-09-15

Applicant: IBM

Inventor： ASTHANA PRAVEEN

IPC: G11B33/14 ,  G11B7/0037 ,  G11B7/12 ,  G11B11/10 ,  G11B11/105 ,  G11B7/00

Abstract: The optical disc drive has a processor which receives a first portion of the light beam reflected off of the disc surface and generates a signal representative of information recorded on the disc. A second processor receives a second portion of the light beam reflected off of the disc surface and generates a second signal representative of track crossings. A gain value is determined for the second signal. A base gain value is established and stored for the second signal. The determined gain value and stored base gain value are compared. An alert signal is generated if the determined gain value exceeds a predetermined percentage of the base gain value to indicate an excessive buildup of contamination on optical elements in the optical recording device. At least a portion of the optical head is cleaned in response to the alert signal.

公开(公告)号：DE69615060T2

公开(公告)日：2002-06-06

申请号：DE69615060

申请日：1996-12-04

Applicant: IBM

Inventor： ASTHANA PRAVEEN ,  KULAKOWSKI EDWARD

IPC: G11B20/12 ,  G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B20/18 ,  G11B27/034 ,  G11B27/32 ,  G11B27/36 ,  G11B19/04

Abstract: Methods for recording information onto CD-Recordable and CD-Erasable optical disks are provided. In a first embodiment, after a session or packet of data is recorded, it is verified to detect unrecoverable errors. If no such errors are present, the session or packet is fixed and recording ends. If an unrecoverable error is detected, the session or packet is re-recorded in an area of the disk immediately following the originally recorded area. When the recorded data is verified as being readable, the session or packet is fixed by recording lead-in and lead-out areas on the disk and by updating a table of contents with the location of the verified data and not the originally recorded data. In a second embodiment, the data is checked as it is recorded. If a defect is suspected, recording halts and the presence of the defect is verified. If a defect is present, the data is re-recorded in an area of the disk immediately following the originally recorded area. When the data is verified as being readable, the session or packet is fixed and recording ends.

公开(公告)号：DE69615060D1

公开(公告)日：2001-10-11

申请号：DE69615060

申请日：1996-12-04

Applicant: IBM

Inventor： ASTHANA PRAVEEN ,  KULAKOWSKI EDWARD

IPC: G11B20/12 ,  G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B20/18 ,  G11B27/034 ,  G11B27/32 ,  G11B27/36 ,  G11B19/04

Abstract: Methods for recording information onto CD-Recordable and CD-Erasable optical disks are provided. In a first embodiment, after a session or packet of data is recorded, it is verified to detect unrecoverable errors. If no such errors are present, the session or packet is fixed and recording ends. If an unrecoverable error is detected, the session or packet is re-recorded in an area of the disk immediately following the originally recorded area. When the recorded data is verified as being readable, the session or packet is fixed by recording lead-in and lead-out areas on the disk and by updating a table of contents with the location of the verified data and not the originally recorded data. In a second embodiment, the data is checked as it is recorded. If a defect is suspected, recording halts and the presence of the defect is verified. If a defect is present, the data is re-recorded in an area of the disk immediately following the originally recorded area. When the data is verified as being readable, the session or packet is fixed and recording ends.

公开(公告)号：HK1015934A1

公开(公告)日：1999-10-22

申请号：HK99100877

申请日：1999-03-02

Applicant: IBM

Inventor： ASTHANA PRAVEEN ,  KULAKOWSKI JOHN EDWARD

IPC: G11B7/00 ,  G11B20/12 ,  G11B7/004 ,  G11B7/0045 ,  G11B20/18 ,  G11B27/034 ,  G11B27/32 ,  G11B27/36 ,  G11B

Abstract: Methods for recording information onto CD-Recordable and CD-Erasable optical disks are provided. In a first embodiment, after a session or packet of data is recorded, it is verified to detect unrecoverable errors. If no such errors are present, the session or packet is fixed and recording ends. If an unrecoverable error is detected, the session or packet is re-recorded in an area of the disk immediately following the originally recorded area. When the recorded data is verified as being readable, the session or packet is fixed by recording lead-in and lead-out areas on the disk and by updating a table of contents with the location of the verified data and not the originally recorded data. In a second embodiment, the data is checked as it is recorded. If a defect is suspected, recording halts and the presence of the defect is verified. If a defect is present, the data is re-recorded in an area of the disk immediately following the originally recorded area. When the data is verified as being readable, the session or packet is fixed and recording ends.

公开(公告)号：DE69420218D1

公开(公告)日：1999-09-30

申请号：DE69420218

申请日：1994-09-15

Applicant: IBM

Inventor： ASTHANA PRAVEEN

IPC: G11B33/14 ,  G11B7/0037 ,  G11B7/12 ,  G11B11/10 ,  G11B11/105 ,  G11B7/00

Abstract: The optical disc drive has a processor which receives a first portion of the light beam reflected off of the disc surface and generates a signal representative of information recorded on the disc. A second processor receives a second portion of the light beam reflected off of the disc surface and generates a second signal representative of track crossings. A gain value is determined for the second signal. A base gain value is established and stored for the second signal. The determined gain value and stored base gain value are compared. An alert signal is generated if the determined gain value exceeds a predetermined percentage of the base gain value to indicate an excessive buildup of contamination on optical elements in the optical recording device. At least a portion of the optical head is cleaned in response to the alert signal.

公开(公告)号：SG43707A1

公开(公告)日：1997-11-14

申请号：SG1996000008

申请日：1994-09-15

Applicant: IBM

Inventor： ASTHANA PRAVEEN

IPC: G11B33/14 ,  G11B7/0037 ,  G11B7/12 ,  G11B11/10 ,  G11B11/105 ,  G11B7/00

Abstract: The optical disc drive has a processor which receives a first portion of the light beam reflected off of the disc surface and generates a signal representative of information recorded on the disc. A second processor receives a second portion of the light beam reflected off of the disc surface and generates a second signal representative of track crossings. A gain value is determined for the second signal. A base gain value is established and stored for the second signal. The determined gain value and stored base gain value are compared. An alert signal is generated if the determined gain value exceeds a predetermined percentage of the base gain value to indicate an excessive buildup of contamination on optical elements in the optical recording device. At least a portion of the optical head is cleaned in response to the alert signal.