# US 2008/0186820 A1 · Method of adjusting write strategy of recordable disc > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0186820 A1 - Document ID: US20080186820A1 - Status: Published application - Kind: A1 - Application number: 12/019,549 - Filed: 2008-01-24 - Published: 2008-08-07 - Earliest claimed: 2007-02-06 - Assignees: Lite-On It Corporation - Inventors: Shih-Kai Weng; Ling-Feng Chen; Chao-Wen Hu; Yi-Hsueh Lee - Web page: https://patentgrep.com/patent/US20080186820A1 ## CPC - G11B 7/00456: {Recording strategies, e.g. pulse sequences (G11B7/0062 takes precedence)} - G11B 7/1267: Power calibration - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract A method of adjusting a write strategy of a recordable disc comprises steps of: generating a test pattern on a power calibrating area of the recordable disc according to a first write strategy and a first write power; establishing a Pit-to-Land Inter-Symbol Interference table and a Land-to-Pit Inter-Symbol Interference table by measuring a plurality of Pits and Lands with different time lengths in the test pattern; generating an updated timing parameter set by adjusting a timing parameter set of the first write strategy according to the Pit-to-Land Inter-Symbol Interference table and the Land-to-Pit Inter-Symbol Interference table; generating an updated overdrive power by adjusting an overdrive power of the first write strategy according to the Pit-to-Land Inter-Symbol Interference table and the Land-to-Pit Inter-Symbol Interference table; and defining a second write strategy according to the updated timing parameter set and the updated overdrive power. ## Claims ### Claim 1 A method of adjusting a write strategy of a recordable disc, comprising steps of: generating a test pattern on a power calibrating area of the recordable disc according to a first write strategy and a first write power; establishing a Pit-to-Land Inter-Symbol Interference table and a Land-to-Pit Inter-Symbol Interference table by measuring a plurality of Pits and Lands with different time lengths in the test pattern; generating an updated timing parameter set by adjusting a timing parameter set of the first write strategy according to the Pit-to-Land Inter-Symbol Interference table and the Land-to-Pit Inter-Symbol Interference table; generating an updated overdrive power by adjusting an overdrive power of the first write strategy according to the Pit-to-Land Inter-Symbol Interference table and the Land-to-Pit Inter-Symbol Interference table; and defining a second write strategy according to the updated timing parameter set and the updated overdrive power. ### Claim 2 (depends on 1) The method according to claim 1, further comprising a step of generating the test pattern on the power calibrating area according to the second write strategy and a second write power. ### Claim 3 (depends on 1) The method according to claim 1, wherein the timing parameter set at least includes a front-edge delay time, a rear-edge advance time, a front-end overdrive time, and a rear-end overdrive time. ### Claim 4 A method of adjusting a write strategy of a recordable disc, comprising steps of: generating m test patterns on a power calibrating area of the recordable disc according to m write strategies and m write powers; temporarily storing the m jitter values and the corresponding m write strategies and the corresponding m write powers; selecting the smallest jitter value among the m jitter values, and its corresponding write strategy and corresponding write power; and defining the corresponding write strategy is an optimal write strategy and defining the corresponding write power is an optimal write power; wherein a first write strategy is generated prior to a second write strategy among the m write strategies, and the second write strategy is generated according to a first Pit-to-Land Inter-Symbol Interference table and a first Land-to-Pit Inter-Symbol Interference table which are established by measuring a first test pattern generated by the first write strategy. ### Claim 5 (depends on 4) The method according to claim 4, wherein the second write strategy is generated by adjusting a first overdrive power and a first timing parameter set of the first write strategy. ### Claim 6 (depends on 5) The method according to claim 5, wherein the first timing parameter set at least includes a front-edge delay time, a rear-edge advance time, a front-end overdrive time, and a rear-end overdrive time. ### Claim 7 A method of adjusting a write strategy of a recordable disc, comprising steps of: forming a plurality of Pits and Lands with different time lengths on the recordable disc by using a first write strategy and a first write power; establishing a Pit-to-Land Inter-Symbol Interference table and a Land-to-Pit Inter-Symbol Interference table by measuring these Pits and Lands; generating an updated timing parameter set by adjusting a timing parameter set of the first write strategy according to the Pit-to-Land Inter-Symbol Interference table and the Land-to-Pit Inter-Symbol Interference table; generating an updated overdrive power by adjusting an overdrive power of the first write strategy according to the Pit-to-Land Inter-Symbol Interference table and the Land-to-Pit Inter-Symbol Interference table; and defining a second write strategy according to the updated timing parameter set and the updated overdrive power. ### Claim 8 (depends on 7) The method according to claim 7, further comprising a step of generating the test pattern on a power calibrating area according to the second write strategy and a second write power. ### Claim 9 (depends on 7) The method according to claim 7, wherein the timing parameter set at least includes a front-edge delay time, a rear-edge advance time, a front-end overdrive time, and a rear-end overdrive time.