Contamination detection apparatus and method using write power c

Details Contamination detection apparatus and method using write power c Contamination detection apparatus and method using write power c

1995-05-30

1996-09-10

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, 369 4425, G11B 700

Patent

active

055552374

ABSTRACT:
A system to monitor write power calibration values in an optical drive to detect media and lens contamination, and take appropriate remedial action when contamination is found. A laser device writes data to an optical medium housed in the optical drive by imparting a laser beam upon the medium. The laser device provides the laser beam with a level of output power selected in accordance with a W/C value. A controller generates and repeatedly updates the W/C value, and provides it to the laser device. The controller samples the W/C value at selected times, and compares it to a predetermined value. If the W/C value exceeds the predetermined value, the controller executes a specific operational sequence. For example, the controller may issue a contamination warning. When the W/C value exceeds a second predetermined value, the controller may logically write-protect the optical medium, or shift the medium to another optical drive. Where the controller is implemented in an optical library with multiple optical drives, the controller may store a comprehensive list of W/C values for the drives.

REFERENCES:
patent: 4750163 (1988-06-01), Yamamiya et al.
patent: 4792933 (1988-12-01), Suzuki
patent: 5046158 (1991-09-01), Groen
patent: 5050156 (1991-09-01), Barton
patent: 5184343 (1993-02-01), Johann et al
patent: 5185733 (1993-02-01), Finkelstein et al.
patent: 5210735 (1993-05-01), Hoshino et al.
patent: 5226027 (1993-07-01), Bakx
patent: 5274622 (1993-12-01), Kono
patent: 5353270 (1994-10-01), Iimura

Affiliated with

Also associated with

Rating

Contamination detection apparatus and method using write power c does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Contamination detection apparatus and method using write power c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contamination detection apparatus and method using write power c will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1326341