# US 7,609,596 B2 · Storage apparatus and computer-readable storage medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,596 B2 - Document ID: US7609596B2 - Status: Granted - Kind: B2 - Application number: 11/231,392 - Filed: 2005-09-21 - Published: 2006-12-21 - Granted: 2009-10-27 - Earliest claimed: 2005-06-20 - Assignees: Fujitsu Limited - Inventors: Mamoru Mori - Web page: https://patentgrep.com/patent/US7609596B2 ## CPC - G11B 20/1883: {Methods for assignment of alternate areas for defective areas} - G11B 7/00375: {arrangements for detection of physical defects, e.g. of recording layer} - G11B 7/00458: {Verification, i.e. checking data during or after recording} - G11B 19/04: Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions - G11B 20/10: Digital recording or reproducing - G11B 11/10502: {characterised by the transducing operation to be executed} - G11B 11/10595: {Control of operating function} - G11B 2220/20: Disc-shaped record carriers - 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 storage apparatus carries out a write verify process to verify whether or not information is correctly written immediately after writing the information in a write target region of a recording medium. The storage apparatus judges whether or not a plurality of defective regions on the recording medium where a verify process failed are arranged along a radial direction of the recording medium if a number of retry processes of the verify process with respect to the write target region exceeds a first threshold value, and reduces a second threshold value of a number of write retry processes if the plurality of defective regions are arranged along the radial direction of the recording medium. ## Claims ### Claim 1 A storage apparatus comprising: a recording medium; a head configured to write information on and read information from the recording medium; and a controller configured to control the head to carry out a write verify porocess which verifies whether or not information is correctly written by reading the information immediately after writing the information in a write target region of the recording medium, wherein the controller is further configured to: judge whether or not a plurality of defective regions on the recording medium where a verify process failed are arranged along a radial direction of the recording medium, if a number of retry processes of the verify process with respect to the write target region exceeds a first threshold value; and reduce a second threshold value of a number of write retry processes, if the plurality of defective regions are arranged along the radial direction of the recording medium. ### Claim 2 (depends on 1) The storage apparatus as claimed in claim 1, wherein the controller is further configured to: carry out an alternate process with respect to the write target region, if the number of write retry processes exceeds the second threshold value. ### Claim 3 (depends on 2) The storage apparatus as claimed in claim 2, wherein the controller is further configured to: change a condition of the verify process with respect to the write target region, if the number of retry processes of the verify process is less than or equal to the first threshold value. ### Claim 4 (depends on 1) The storage apparatus as claimed in claim 1, wherein the controller is further configured to: change a condition of the verify process with respect to the write target region, if the number of retry processes of the verify process is less than or equal to the first threshold value. ### Claim 5 A storage apparatus comprising: a recording medium; a head configured to write information on and read information from the recording medium; and a controller configured to control the head to carry out a write verify process which verifies whether or not information is correctly written by reading the information immediately after writing the information in a write target region of the recording medium, wherein the controller is further configured to: judge whether or not a defective region on the recording medium where a write retry process failed and a defective region on the recording medium where a servo error is generated are arranged along a radial direction of the recording medium, if a number of write retry processes of the verify process with respect to the write target region exceeds a threshold value; and reduce the threshold value, if the defective region where the write retry process failed and the defective region where the servo error is generated are arranged along the radial direction of the recording medium. ### Claim 6 (depends on 5) The storage apparatus as claimed in claim 5, wherein the controller is further configured to: carry out an alternate process with respect to the write target region, if the number of write retry processes with respect to the write target region exceeds the threshold value. ### Claim 7 (depends on 6) The storage apparatus as claimed in claim 6, wherein the controller is further configured to: carry out a verify process with respect to the write target region, if the defective region in which the servo error is generated does not exist in the write target region. ### Claim 8 (depends on 5) The storage apparatus as claimed in claim 5, wherein the controller is further configured to: carry out a verify process with respect to the write target region, if the defective region in which the servo error is generated does not exist in the write target region. ### Claim 9 A computer-readable storage medium which stores a program for causing a computer to carry out a write verify process to verify whether or not information is correctly written immediately after writing the information in a write target region of a recording medium, said program comprising: a procedure causing the computer to judge whether or not a plurality of defective regions on the recording medium where a verify process failed are arranged along a radial direction of the recording medium, if a number of retry processes of the verify process with respect to the write target region exceeds a first threshold value; and a procedure causing the computer to reduce a second threshold value of a number of write retry processes, if the plurality of defective regions are arranged along the radial direction of the recording medium. ### Claim 10 (depends on 9) The computer-readable storage medium as claimed in claim 9, wherein said program further comprises: a procedure causing the computer to carry out an alternate process with respect to the write target region, if the number of write retry processes exceeds the second threshold value. ### Claim 11 (depends on 10) The computer-readable storage medium as claimed in claim 10, wherein said program further comprises: a procedure causing the computer to change a condition of the verify process with respect to the write target region, if the number of retry processes of the verify process is less than or equal to the first threshold value. ### Claim 12 (depends on 9) The computer-readable storage medium as claimed in claim 9, wherein said program further comprises: a procedure causing the computer to change a condition of the verify process with respect to the write target region, if the number of retry processes of the verify process is less than or equal to the first threshold value. ### Claim 13 A computer-readable storage medium which stores a program for causing a computer to carry out a write verify process to verify whether or not information is correctly written immediately after writing the information in a write target region of a recording medium, said program comprising: a procedure causing the computer to judge whether or not a defective region on the recording medium where a write retry process failed and a defective region on the recording medium where a servo error is generated are arranged along a radial direction of the recording medium, if a number of write retry processes of the verify process with respect to the write target region exceeds a threshold value; and a procedure causing the computer to reduce the threshold value, if the defective region where the write retry process failed and the defective region where the servo error is generated are arranged along the radial direction of the recording medium. ### Claim 14 (depends on 13) The computer-readable storage medium as claimed in claim 13, wherein said program further comprises: a procedure causing the computer to carry out an alternate process with respect to the write target region, if the number of write retry processes with respect to the write target region exceeds the threshold value. ### Claim 15 (depends on 14) The computer-readable storage medium as claimed in claim 14, wherein said program further comprises: a procedure causing the computer to carry out a verify process with respect to the write target region, if the defective region in which the servo error is generated does not exist in the write target region. ### Claim 16 (depends on 13) The computer-readable storage medium as claimed in claim 13, wherein said program further comprises: a procedure causing the computer to carry out a verify process with respect to the write target region, if the defective region in which the servo error is generated does not exist in the write target region.