System and method for detecting and recovering from an off-format state in an optical disc drive
A disc drive includes a tracking actuator, and determines when the tracking actuator is positioned off a formatted portion of optical media in the disc drive. The optical media includes a pitted premastered area that cannot be overwritten and a grooved user-writeable area that can be overwritten. Tracking control effort is monitored to determine when the tracking actuator is in the off-format condition and whether tracking good or tracking bad is detected within a predetermined time period. An absolute value of the tracking control effort is generated and the absolute value of the tracking control effort is filtered. An off-format condition is indicated if the filtered value of the tracking control effort is not within a predetermined threshold value.
1 . An optical disc drive, comprising:
a tracking actuator; and
instructions operable to determine when the tracking actuator is positioned off a formatted portion of optical media in the disc drive.
2 . The system, as set forth in claim 1 , further comprising:
instructions operable to monitor tracking control effort to determine when the tracking actuator is in the off-format condition.
3 . The system, as set forth in claim 1 , wherein the instructions operable to determine when the tracking actuator is positioned off a formatted portion of optical media in the disc drive are further operable to determine whether tracking good or tracking bad is detected within a predetermined time period.
4 . The system, as set forth in claim 2 , further comprising:
instructions operable to generate an absolute value of the tracking control effort.
5 . The system, as set forth in claim 4 , further comprising:
instructions operable to filter the absolute value of the tracking control effort.
6 . The system, as set forth in claim 5 , further comprising:
a low pass filter to filter the absolute value of the tracking control effort.
7 . The system, as set forth in claim 6 , further comprising:
instructions operable to determine whether the absolute, filtered value of the tracking control effort is within a predetermined threshold value.
8 . The system, as set forth in claim 1 , further comprising:
instructions operable to indicate an off-format condition when the tracking control effort is not within the predetermined threshold value.
9 . A method for controlling an optical disc drive, wherein the optical disc drive includes a tracking actuator, the method comprising:
determining when the tracking actuator is positioned off a formatted portion of optical media in the disc drive.
10 . The method, as set forth in claim 9 , further comprising:
monitoring tracking control effort to determine when the tracking actuator is in the off-format condition.
11 . The method, as set forth in claim 9 , wherein determining when the tracking actuator is positioned off a formatted portion of optical media in the disc drive includes determining whether tracking good or tracking bad is detected within a predetermined time period.
12 . The method, as set forth in claim 11 , further comprising:
generating an absolute value of the tracking control effort.
13 . The method, as set forth in claim 12 , further comprising:
filtering the absolute value of the tracking control effort.
14 . The method, as set forth in claim 13 , further comprising:
low pass filtering the absolute value of the tracking control effort.
15 . The method, as set forth in claim 14 , further comprising:
determining whether the absolute, filtered value of the tracking control effort is within a predetermined threshold value.
16 . The method, as set forth in claim 9 , further comprising:
indicating an off-format condition when the tracking control effort is not within the predetermined threshold value.
17 . A computer program product, comprising:
instructions for implementing the method of claim 9 .
18 . A data signal comprising:
instructions for implementing the method of claim 9 .
19 . An apparatus for controlling an optical disc drive, wherein the optical disc drive includes a tracking actuator, the apparatus comprising:
means for determining when the tracking actuator is positioned off a formatted portion of optical media in the disc drive.
20 . The apparatus, as set forth in claim 19 , further comprising:
means for monitoring tracking control effort to determine when the tracking actuator is in the off-format condition.
21 . The apparatus, as set forth in claim 19 , wherein the means for determining when the tracking actuator is positioned off a formatted portion of optical media in the disc drive includes means for determining whether tracking good or tracking bad is detected within a predetermined time period.
22 . The apparatus, as set forth in claim 21 , further comprising:
means for generating an absolute value of the tracking control effort.
23 . The apparatus, as set forth in claim 22 , further comprising:
means for filtering the absolute value of the tracking control effort.
24 . The apparatus, as set forth in claim 23 , further comprising:
means for low pass filtering the absolute value of the tracking control effort.
25 . The apparatus, as set forth in claim 24 , further comprising:
means for determining whether the absolute, filtered value of the tracking control effort is within a predetermined threshold value.
26 . The apparatus, as set forth in claim 19 , further comprising:
means for indicating an off-format condition when the tracking control effort is not within the predetermined threshold value.
27 . The apparatus, as set forth in claim 19 , wherein the optical media includes a pitted premastered area that cannot be overwritten and a grooved user-writeable area that can be overwritten.