WO2006090454A1 - 記憶装置、欠陥チェック方法及びプログラム - Google Patents
記憶装置、欠陥チェック方法及びプログラム Download PDFInfo
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- WO2006090454A1 WO2006090454A1 PCT/JP2005/003004 JP2005003004W WO2006090454A1 WO 2006090454 A1 WO2006090454 A1 WO 2006090454A1 JP 2005003004 W JP2005003004 W JP 2005003004W WO 2006090454 A1 WO2006090454 A1 WO 2006090454A1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
- G11B20/1833—Error detection or correction; Testing, e.g. of drop-outs by adding special lists or symbols to the coded information
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
- G11B20/1816—Testing
- G11B2020/1826—Testing wherein a defect list or error map is generated
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2508—Magnetic discs
- G11B2220/2516—Hard disks
Definitions
- the present invention relates to a storage device, a defect check method, and a program for checking a defect of a medium such as a magnetic disk and generating defect sector information, and in particular, creating defective sector information that supports sector formats having different sector lengths.
- the present invention relates to a possible storage device, a defect check method, and a program.
- the sector length is fixed to, for example, 512 bytes.
- a sector unit is used.
- check data is written with a fixed sector length and then read in units of sector and stored in a buffer. The pattern position that is different from the expected value is detected on the noffer, and the byte position from the index is calculated. Store in the system area of the media.
- a defect check of a storage device that supports a plurality of sector lengths is performed by performing a defect check using a fixed sector length of 512 bytes, and then performing a defect check by shifting the head position of the sector.
- the first defect check is used to check for gaps between sectors.
- FIGS. 1A to 1C show the first defect check using a fixed sector length in a storage device that supports a plurality of sector lengths.
- the write gate signal in Fig. 1 (C) is synchronized with the sector pulse in Fig. 1 (B) generated based on the fixed sector length.
- the defect position is judged from a different pattern compared to the value.
- the sector pulse generation position is shifted with respect to the first time, the write gate signal is generated, the check data is written, and the read gate signal is generated after writing.
- the defect is checked for the gap between the sectors that were missing at the first time.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-071061
- determining a specific sector length among a plurality of sector lengths before shipment from the factory means that a defect check is performed in anticipation of sales for each sector length, unless it is a custom production from a user. There is a problem that production planning is difficult.
- man-hours are required for defect checking and productivity is lowered.
- defect checking check data is written and read in units of sectors on the entire surface of the medium, and then the defect is determined by comparing with the expected value on the buffer to identify the defect position, and the index. Since the force also calculates the distance to the defect position, there is a problem that it takes time to check the defect.
- the conventional defect check reads the check data written on the entire surface of the medium.
- the memory capacity of the notifier is 4
- the memory capacity of the notifier is 4
- An object of the present invention is to provide a storage device, a defect check method, and a program in which a defect check supporting a plurality of sector lengths is completed by writing and reading check data once. Means for solving the problem
- the present invention provides a storage device.
- the storage device of the present invention is generated by a check data write / read unit for writing and reading defect check data in units of data frames between servo frames recorded on a medium, and reading of check data in units of data frames.
- Log creation unit that creates and saves log information from defect detection data, and defective sector information that creates and stores defective sector information (defective sector map) that indicates the position of the defective sector at a predetermined sector length by analyzing the log information
- a creation unit that creates and saves log information from defect detection data, and defective sector information that creates and stores defective sector information (defective sector map) that indicates the position of the defective sector at a predetermined sector length by analyzing the log information
- a creation unit that creates and saves log information from defect detection data, and defective sector information that creates and stores defective sector information (defective sector map) that indicates the position of the defective sector at a predetermined sector length by analyzing the log information
- a creation unit that creates and saves log information
- the defective sector information creation unit creates the log information defect sector information created in the process of the previous track in parallel with the writing / reading process of one track performed in the check data writing / reading unit. Execute the process.
- the check data writing / reading unit includes a read channel circuit (RDC), and the read channel circuit converts the analog read signal of the head into a digital signal and outputs a check data demodulated, and an analog read signal. It is possible to select and set the second mode for outputting defect detection data in which analog fluctuations including levels and shifts due to defects are determined. The second mode is selected and set to output defect detection data.
- RDC read channel circuit
- the check data writing / reading unit starts writing check data for one track and starts reading check data for one track at each timing when the first servo gate signal is obtained after on-tracking to the track to be processed.
- the switch to the next track is instructed sequentially, and the log creation unit creates and saves log information from the defect detection data read by the track force and saves the index address pointer indicating the log position immediately after the index.
- the defective sector information creation unit reads and processes the log information from the log position indicated by the index address pointer.
- the log creation unit processes defect detection data output by medium reading in units of data frames and then saves it as log information.
- the log creation unit compares the defect detection data with preset mask data, and excludes it from the log target when it is determined as a mask target.
- the log creation unit compares the defect detection data with the preset mask data and determines that it is not masked, the log creation unit compares the defect detection data with a predetermined defect selection value, and logs when the defect selection value is included. Save as information.
- the log creation unit expands the preceding medium detection data, combines it with the subsequent medium detection data, and converts it into one defect detection data.
- the log creating unit stores defect information determined from the defect detection data following the frame start position information for each data frame as log information.
- the log creation unit stores defect start position, defect length, and defect type as defect information.
- the defective sector information creation unit converts one or more pieces of defect information included in the log information into a sector number, and if the total number of defects in the same sector exceeds the CC correction capability, a defect sector is detected as a defect sector. Register in sector information.
- the defective sector information creation unit creates defective sector information from log information for a plurality of different sector lengths as necessary.
- the defective sector information creation unit changes the sector length to another predetermined sector length and logs the defective sector information when the total number of defective sectors exceeds a predetermined allowable value. Recreate from
- the present invention provides a storage device defect checking method.
- the defect check method of the present invention comprises a check data write / read step for writing and reading defect check data in units of data frames between servo frames recorded on a medium;
- Defective sector indicating the position of the defective sector in a predetermined sector length by analyzing log information
- the present invention provides a program executed by a computer of a storage device.
- the program of the present invention is stored in the computer of the storage device.
- a check data write / read step for writing and reading defect check data in units of data frames between servo frames recorded on the medium
- a defective sector information creation step for creating and storing defective sector information indicating a position of a defective sector in a predetermined sector length by analyzing log information
- a storage device that supports a plurality of sector lengths by performing a defect check by writing and reading check data in units of data frames between servo frames recorded on a medium.
- a defect check by writing and reading check data in units of data frames between servo frames recorded on a medium.
- the writing of check data to the medium is performed by analyzing the log information of the previous track and creating defective sector information.
- the creation of defective sector information can be completed almost at the same time as the creation of log information by means of processing, and the processing time can be shortened compared to the case where defective sector information is created after storage on the nof Can also reduce the buffer capacity [0029]
- the defect detection data obtained by determining the level fluctuation or level shift due to the medium defect of the head read signal is output as the operation mode of the read channel used for reading.
- Second mode acquire the defect detection data for which the defect is determined as check data, and create log information to create the log information.
- 1 mode it is not necessary to compare the read check data output from the read channel with the expected value to determine the defect position, reducing the processing load of the defect check and shortening the processing time.
- defect detection data Processing such as rounding that is integrated into one when the occurrence interval is short reduces the registration capacity of the required log information, and reduces the burden and time of creating defective sector information by analyzing log information Can be reduced.
- FIG. 1 A time chart of writing / reading check data twice in a conventional device that supports a plurality of sector lengths.
- FIG. 2 is a block diagram of a functional configuration of a magnetic disk device according to the present invention.
- FIG. 4 Explanatory drawing of check data writing process in the device configuration of FIG.
- FIG. 6 Explanatory drawing of check data read processing in the device configuration of FIG.
- FIG. 7 Time chart of read processing of FIG.
- FIG. 9 Explanatory diagram of log information and index address pointer created by the read process of FIG.
- FIG. 11 Flow chart of defect check processing by the processor of FIG.
- FIG. 12 Format explanatory diagram of defect log information stored in DRAM of Fig. 2
- FIG. 13 Flow chart of log registration process by defect check in Fig. 2
- FIG. 22 is a flowchart of defective sector map creation processing by the processor of FIG.
- FIG. 23 is a flowchart of defective sector map creation processing following FIG.
- FIG. 2 is a block diagram of a magnetic disk apparatus to which the defect check processing according to the present invention is applied.
- a magnetic disk device known as a hard disk drive (HDD) is composed of a circuit board 10 and a disk enclosure 11.
- the circuit board 10 is provided with a processor 12, a hard disk controller (HDC) 14, a read channel (RDC) 16, a servo control unit 18, and a DRAM 20.
- the disk enclosure 11 is provided with a read Z write amplifier 24, a head assembly 26, a voice coin motor 28 and a spindle motor 30.
- One or a plurality of magnetic disk media are mounted on the rotation shaft of the spindle motor 30 and rotated at a constant speed.
- the head assembly 26 is supported at the tip of the head actuator's arm, and the head actuator 26 is driven by a voice coil motor 28, thereby combining the head assembly 26 with a read head and a write head.
- the head is positioned with respect to the medium surface of the magnetic disk medium.
- the write head of the composite head provided in the head assembly 26 is connected to the write amplifier side of the read / write amplifier 24, and the read head is connected to the read amplifier side of the read / write amplifier 24.
- the read Z write amplifier 24 is provided with a head select circuit of the head provided in the head assembly 26, and performs writing or reading by a head select signal based on a write command or a read command from the processor 12. Select one head.
- the processor 12 provided in the circuit board 10 is provided with a check data writing / reading unit 32, a log creating unit 34, and a defect sector information creating unit 36 as functions realized by program execution or firmware. Yes.
- the hard disk controller 14 is provided with a FIF 038, a formatter 40, a sector pulse generator 42 and a defect checker 44.
- the read channel 16 has a function of outputting defect detection data used to create defect log information in the defect check processing of the present invention when the check data is read from the magnetic disk medium. 48 and a mode setting section 46 are provided.
- the DRAM 20 stores check data 50 used for defect check and defect log information 52 created and registered by reading the check data from the magnetic disk medium. ing. Furthermore, the defect sector map created by calculation from the defect log information 52 obtained by the defect check process of the present invention is not shown in the disk enclosure 11 and is stored in the system area of the magnetic disk medium. Is done. [0040]
- the circuit board 10 and the disk enclosure 12 perform normal write processing and read processing based on commands from the host. Here, the normal operation of the magnetic disk device will be briefly described as follows.
- the processor 12 decodes the write command and functions as a transfer buffer if necessary.
- the write data received including the buffering of the DRAM 20 is converted into a predetermined data format by the formatter 40 provided in the hard disk controller 14, and an ECC code is added by an ECC processing unit (not shown), so that the write system in the read channel 16 After scramble, RLL code conversion, and write compensation, writing is performed on the magnetic disk medium from the write head of the selected head via the head assembly 26 from the write amplifier.
- a head positioning signal is given from the processor 12 to the servo control unit 18 using a DSP or the like, and the head is sought to the position instructed by the command by the voice coil motor 28, and then the positioning control is performed to turn on the track Go and go.
- the read signal read from the read head selected by the head select of the head assembly 26 is amplified by the read amplifier and then input to the read system of the read channel 16.
- Read data is recovered by partial response maximum likelihood detection (PRML), etc., ECC processing is performed by the hard disk controller 14 to detect and correct errors, and then buffered in DRAM 20 as a transfer buffer, and the read data is hosted from the host interface. Forward to.
- PRML partial response maximum likelihood detection
- the check data writing / reading unit 32 provided in the processor 12 expands the check data 50 on the DRAM 20 when the defect check processing is started, and then passes through the hard disk controller 14 and the read channel 16 to the disk enclosure. On the 11th magnetic disk medium, a check data writing / reading process is performed in which check data is recorded after being written in units of data frames between servo frames.
- the log creating unit 34 of the processor 12 detects a defect generated by the check data writing / reading unit 32 by reading the check data in units of magnetic disk medium force data frames.
- the log data also creates log information and registers it in the DRAM 20 as defect log information 52.
- the mode setting unit 46 performs mode setting for enabling the function of the defect detection unit 48 in the read channel 16.
- the analog read signal read from the magnetic disk medium by the head is converted from analog to digital, and the read data is demodulated by partial response maximum likelihood detection, etc., as in the case of read operation by a read command from a normal host.
- Two operation modes are selectable: the first mode for output and the second mode for output of defect detection data by discriminating fluctuations due to defects such as the level of the analog read signal from the head and level shift .
- the mode setting unit 46 sets the second mode in which defect detection data is output as read data to the lead channel 16.
- the function of the defect detection unit 48 is made effective.
- the read channel 16 sends the defect detection data to the NRZ data if a defect is determined.
- the defect detection data is registered in the DRAM 20 as defect log information 52 under the instruction of the log creating unit 34.
- the defect detection data output from the read channel 16 is sent from the formatter 40 of the hard disk controller 14 to the defect checker 44, and further stored in the DRAM 20 through the FIF 038.
- the defect checker 44 removes the defect detection data output from the read channel 16 from the log target by mask data, extracts it as a log target by the log selection value, and continues the defect detection data at a predetermined data interval. After processing such as rounding to be combined in one case, it is registered in the defect log information 52 via FIF038.
- the defective sector information creation unit 36 analyzes the defect log information 52 registered in the DRAM 20 to detect defective sectors in specific sector lengths in a plurality of sector lengths supported by the magnetic disk device of the present invention.
- a defective sector map as defective sector information indicating the position of the disk is created and stored in the system area of the magnetic disk medium.
- FIG. 3 is an explanatory diagram of a servo frame and a data frame in a track of the magnetic disk medium provided in the magnetic disk device of FIG. Figure 3 shows one track on a magnetic disk medium.
- the indexed servo frame 56-1 storing index information is provided at the beginning of the track, and the servo frame 56-1 with the index is used as the starting point.
- Data frames 58-1 to 58-n are arranged between a plurality of servo frames 56-2 to 56n starting from the indexed servo frame 56-1 and the data frames 58-1 1 58 — For each of the two, data is read and written after sector formatting with multiple sector lengths, eg 512 bytes or 520 bytes.
- FIG. 4 is an explanatory diagram of the check data writing process in the apparatus configuration of FIG. 2, and FIF038, formatter 40, sector pulse generator 42 and defect checker in the processor 12 and hard disk controller 14 shown in FIG. 44, and a read channel 16 is shown arranged along the data flow with respect to the magnetic disk medium 60.
- the check data 50 for defect check is written and set from the processor 12 to the DRAM 20.
- the check data 50 for example, a repetitive pattern of “0011” which is a 2T pattern is used, and the check data 50 is created by using 8 to 10 bits of this repetitive pattern as one word.
- the size is as follows.
- the processor 12 sets the sector pulse generator 42 so as to generate a sector pulse once immediately after the servo gate signal indicating the servo frame.
- the processor 12 activates the formatter 40 to write the check data 50 for defect checking to the disk medium 60.
- the formatter 40 generates the write gate signal WG in synchronization with the sector pulse over the data frame period between the servo sectors, and sends the check data to the disk via the read channel 16 while the write gate signal is valid. Write to media 60.
- the sector length in writing check data is set to be the data frame length.
- a write gate signal is generated based on the Kuta pulse, and the number of sectors in this case matches the number of servo frames per revolution.
- FIG. 5 is a time chart of the index signal, servo gate signal, sector pulse, and write gate signal in the writing process of FIG.
- the index signal in Fig. 5 (A) is generated by reading the indexed servo frame 56-1 shown in Fig. 3, and the servo gate signal in Fig. 5 (B) is generated in each servo frame 56-1-56 in Fig. 3. — Occurs in sync with reading n.
- Sector panorace in Fig. 5 (C) occurs once between servo gates at the timing immediately after the servo gate.
- the write gate signal in Fig. 5 (D) is generated in synchronization with the sector pulse, and is generated immediately before the next servo gate signal rising force S, that is, the end position of the data frame determined by the servo gate interval.
- the check data reading process shown in FIG. 6 is performed.
- the sector noise generator 42 is set so as to generate sector pulses at the same timing as the writing, and then the formatter 40 is started and writing from the disk medium 6 is completed. Read check data through read channel 16.
- the read channel 16 enables the defect detection unit 48 in the second mode setting by the mode setting unit 46, and therefore the analog level level of the head read signal, shift, etc. Force Defect detection data for which a defect has been determined is output as NRZ data.
- the defect detection data is stored in the FIF 038 through the defect checker 44 as well as the formatter 40 force. When a certain amount of defect detection data is accumulated in FIF038, it is transferred to DRAM 20 and registered as defect log information 52.
- the defect checker 44 performs mask processing, extraction processing, rounding, etc. on the defect detection data obtained via the formatter 40 based on preset mask data, log selection value, and defect length extension count. Process and output to FIF038.
- FIG. 7 is a time chart of the reading process of FIG.
- the index signal is generated by reading the first indexed servo frame, and at the same time, the servo gate signal is generated as shown in Fig. 7 (B), and the servo gate signal is generated at intervals of a fixed rotation angle.
- Figure 7 (C) The sector pulse generator 42 in FIG. 6 is set so that the sector pulse is generated once immediately after the servo gate. This is the same as the writing process in FIG. (D) Read gate signal is generated between data frames.
- the formatter 40 is activated immediately after the servo gate signal in synchronization with the sector pulse, and the defect from the read channel 16 based on the reading from the disk medium 60 over the data frame in which the input gate signal is effectively output. Output detection data.
- the output data from the read channel 16 at the time of reading in FIG. 6 is that the AD converter provided in the read channel 16 generally has a predetermined read latency time. There is a time delay until the NRZ data as detection data becomes valid.
- the read NRZ data in Fig. 7 (D) after the read gate is asserted and a predetermined read latency time T1 has elapsed, the read NRZ data is output to the formatter 40 as valid data. . Similarly, when the read gate is negated, the read NRZ data is also invalidated after the predetermined read latency time T1, and this is repeated thereafter.
- writing and reading are performed by starting the formatter synchronized with the index, but for the second and subsequent tracks, the formatter is asynchronous with the index after on-tracking by track switching. Start up, write and read, and wait for rotation.
- FIG. 8A is a time chart of the first track to be processed first.
- the formatter is activated in synchronization with the sector pulse 152 based on the index 150, and the check data by the write gate signal or the read gate signal is checked.
- the defect detection data D1-Dn of each data frame obtained by reading is obtained continuously for one track in order from the data frame immediately after the index, and sequentially in the log area 64 on the DRAM in FIG.
- an index address pointer 651 indicating the data position immediately after the index is held.
- one track seek was performed in synchronization with the index signal at time tl, and the second track was on-track at time t2 after a certain skew time.
- the formatter is started in synchronization with the sector pulse 156 based on the servo gate signal 154 obtained first, and the check data is written and read by the write gate signal or the read gate signal.
- the defect detection data D1-Dn of each data frame obtained by reading is delayed by the skew time accompanying the track switching with respect to the index 150; ⁇
- One track in order starting from the standing data frame 9 are stored in order in the log area 64 of FIG. 9, and at the same time, the index address pointer 65-2 indicating that the data immediately after the index is the defect detection data Dn-1 is held.
- the formatter is started in synchronization with the sector pulse 160 based on the servo gate signal 158 obtained first after t5, and the check data is written and read repeatedly.
- the formatter is started in synchronization with the servo gate obtained first thereafter, and the check data is written and read.
- log information can always be processed in the order of data frames arranged in order with the index as the head position.
- the searched index address pointer 65-1 indicates the first defect detection data D1.
- the second track reads the position force defect detection data D1—Dn shifted from the index by the skew time associated with the track switching, and stores them in order.
- the index address pointer 65-2 is the defect detection data.
- Dn—1 indicates that the data is read immediately after the index.
- the defect detection data is read in the order of Dn-1, Dn, Dl, Dn-2 from the position of the searched index address pointer 65-2, so that the index is the starting position. It can be read as defect detection data arranged in a row.
- the formatter is activated in synchronization with the index for the first track.
- the first track is also immediately after on-track.
- the formatter is started in synchronization with the servo gate obtained first.
- FIG. 10 is a time chart of the defect check process of the present invention according to the apparatus configuration of FIG. 2, and shows the linked operation of the plug processor 12, formatter 40, defect checker 44 and servo control unit 18.
- the address HHCC for the magnetic disk medium is set in step S1, and the head is magnetized by the seek control step S301 of the servo control unit 18. For example, it is positioned on the first track on the outermost circumference of the disk medium.
- the address HHCC is a combination of the head address HH and the cylinder address (track address) CC. Therefore, the head selection (medium surface selection) and the target track address are specified by the address HHCC.
- step S2 the processor 12 checks the generation of the servo gate signal in step S2.
- step S3 the data Instructs writing of check data in frame units.
- the formatter 40 Upon receiving this instruction, the formatter 40 is activated, and the check data is read in units of data frames in step S101 in synchronization with the sector pulse generated immediately after the servo gate from the sector pulse generator 42 set at the same time. 16 to write to magnetic disk media. This leads to the track shown in Figure 3, starting from the first data frame 58-1 and ending. For each data frame 58-n, the check data is written in units of data frames, that is, the check data is written repeatedly with the data frame as one sector.
- the processor 12 checks the end of writing of the last data frame in step S4. When the end of writing of the last data frame is determined, the processor 12 instructs reading of data in units of data frames in step S5. .
- the formatter 40 sets the read gate under the same sector pulse generation conditions, reads the data of the magnetic disk medium in units of data frames in step S102, and reads the read channel 16 The defect detection data obtained via is transferred to the defect checker 44.
- the defect checker 44 processes the defect detection data transferred via the formatter 40 in step S201 to create defect log information. When a certain amount of data is accumulated in the FIF038, it is registered in the DRAM 20 as defect log information 52. To do.
- step S7 When the on-track state is reached in one track seek by the address set in step S7, the processor 12 monitors the generation of the servo gate signal in step S8, and if the servo gate signal is determined, step S3 and Similarly, in step S9, the writing of check data in units of data frames is instructed. In response to this, in step S103, the check data is written in units of data frames on the magnetic disk medium. Subsequently, the processor 12 executes processing for creating defect sector position information, that is, a defect sector map, for the defect log information registered for the previous track in step S10.
- defect sector position information that is, a defect sector map
- step S12 the processor 12 monitors the end of writing of the final data frame, and if it is determined, in step S12, the processor 12 instructs the formatter 40 to read the check data in units of data frames as in step S5.
- step S104 the data is read from the magnetic disk medium in step S104, the defect detection data obtained from the read channel 16 is transferred to the defect checker 44, and the defect detection data transferred in step S202 is loaded into the data. Therefore, log information is stored in FIF038, and when it reaches a certain amount, it is registered in DRAM 20 as defect log information 52.
- the processor 12 performs a process of creating a defective sector map as defective sector information power defective sector position information registered for the previous track in step S13.
- This defective sector position information creation process is a process following step S10.
- a defect obtained by the previous process for the previous track is created in parallel with the creation and storage of defect log information by writing and reading check data for a certain track. Analyzing log information, a defective sector map for a predetermined sector length is created by parallel processing. For this reason, the creation process of the defect sector map for all tracks is completed almost simultaneously with the creation of the defect log information by writing and reading the check data for all the tracks on the disk medium surface.
- FIG. 11 is a flowchart of defect check processing by the processor 12 of FIG.
- the defect check processing by the processor 12 is performed by setting an address HHCC that specifies the head track position of a head having a magnetic disk medium in step S1 and selecting a head, and then performing a seek control instruction in step S2. Position the head on the first track.
- step S3 the generation of the servo gate signal is checked in step S4. If this is determined, the check data is written in step S5 and checked. Start writing data.
- step S6 a defective sector map creation process based on the log information of the previous track is executed.
- this process is skipped because there is no log information of the previous track.
- step S8 the check data is instructed to be read in units of data frames, and the check data is read from the written track. Output more defect detection data
- step S9 defect detection data is output from the read channel 16 and supplied to the defect checker 44 via the formatter 40.
- the defect detection data is masked, extracted as log information, and further rounded to combine adjacent defect detection data at a predetermined interval. Creates log information and holds an index address pointer for the log information.
- step S10 a defective sector map is created based on the log information of the previous track. This is a process following step S6. If the process is completed in step S6, the process in step S10 is not necessary.
- step S11 when it is determined in step S11 that the reading of the last data frame has been completed, the defect checking process for one track has been completed. Accordingly, in step S12, it is checked whether or not the last track force is satisfied. In step S13, the track address, that is, the cylinder address CC is incremented by 1. Then, the process returns to step S2, and the same process is repeated for the next track.
- step S14 If it was the last track in step S12, it is checked in step S14 whether or not it is the last head. If it is not the last head, the head address HH is incremented by 1 in step S15, and then the process proceeds to step S1. Return, the head selection and head address HHCC are set for the next disk medium surface, and the same processing is repeated.
- step S14 If it is the last head in step S14, a defective sector map creation process based on the log information is performed for the last track in step S16, and then the process ends.
- the defective sector map created for each magnetic disk medium surface is stored in the system area of the checked medium surface.
- FIG. 12 is an explanatory diagram of the format of defect log information reflected in the DRAM 20 of FIG.
- a log area 64 of a predetermined size is secured in the memory area 62 of the DRAM 20, and the head position of the registered log information 66 is expressed by the value of the log address pointer that changes as indicated by an arrow 56-1.
- the initial value of the log address pointer is the top address, and every time the registered log information 66 is stored in the log area 64, the log address pointer is incremented as indicated by arrow 56-1, and the end address is indicated by arrow 56-2. Log registration is terminated when it reaches the limit, and an error occurs due to mouth over for further log registration.
- the log information registered in the log area 64 shows the frame start mark 68-1 for one track, frame number 70-2, followed by the entry 78-1 , 78-2 ... are registered.
- Entries 78—1 contains
- the entry 78—i following the frame start mark 68—i and frame number 70—i is defect detection information in an arbitrary track i.
- the format of the defect log information according to the present invention is not limited to the embodiment shown in FIG. 12.
- Data channel force Information that can specify the defect detection position in the track starting from the index based on the obtained defect detection information. If so, it can be in a format that stores appropriate information.
- the index address pointer shown in FIG. 9 for designating the frame number immediately after the index for each track is held.
- FIG. 13 is a flowchart of log registration processing by the defect checker 44 of FIG.
- the defect detection data 80 shown in Fig. 14 (A) is processed, so the mask data 82 in Fig. 14 (B) and the log selection value in Fig. 14 (C).
- 84 and the defect length extension count 85 of FIG. 14 (D) are preset.
- the defect detection data in Fig. 14 (A) is composed of hexadecimal data (h3 h2 hi), which becomes (bl2-bl) in binary display.
- the analog read signal due to the defect is shown in bit b6.
- the low level is set, the high level of the analog read signal due to the defect is set in bit b7, and the level shift of the analog read signal due to the defect is set in bit b8.
- the mask data 82 in Fig. 14 (B) sets bits to be removed from the log target by masking the defect detection data.
- the mask data 82 is hexadecimal (OlOOh), and defect detection data in which bit 1 in the binary bit string shown on the right side is set is excluded from the log target as a mask target.
- the log selection value 84 in FIG. 14C extracts defect detection data to be registered as log information. Use for.
- the log selection value 84 is, for example, hexadecimal (OOCOh). Bit 1 in the binary bit string shown on the right side is set, and defect detection data is selected and registered as log data.
- a priority is set between the mask data 82 and the log selection value 84, and the priority is set so that the mask data 82 is higher. That is, when the bit of the mask data 82 is set in the defect detection data and the bit of the log selection value 84 is set, the mask data 82 is set to be effective and excluded from the log target. Therefore, the log selection value 84 is applied to defect detection data that is not subject to removal by the mask data 82.
- the defect length extension count 85 in FIG. 14 (D) is positioned backward by extending the defect detection data located at the beginning when the interval of the defect detection data output from the read channel 16 is within 5 words, for example. Executes the process of collecting defect detection data to be rounded into one defect detection data.
- step S1 the AND of the defect detection data and the mask data 82 is calculated, and in step S2, whether or not “0” is checked. If it is not “0”, the mask data 82 bit is set in the defect detection data, so it is determined that the mask is to be masked and log registration is not performed.
- step S 2 If it is “0” in step S 2, the mask detection target is not used in step S 3 and AND between the defect detection data and the log selection value 84 is calculated in step S 4. If the calculation result is negative at step S5, since the bit of the log selection value 84 is set in the defect detection data, the process proceeds to step S6, and this defect detection data is logged. If it is “0” in step S5, the log selection value 84 bit is not set, and the log is not excluded in step S10.
- defect checker 44 further executes event processing for specific defect detection data. As defect detection data to be subjected to event processing, for example, there is abnormal data by thermal asperity (TA).
- TA thermal asperity
- the defect checker 44 obtains an event count by counting the abnormality detection data output from the lead channel 16 due to the occurrence of thermal asperity, and if the event count exceeds a predetermined threshold value, the defect checker 44 has a fault check status. Abnormally terminate the processing.
- FIGS. 15 to 21 show specific examples of processing of defect detection data in the log registration process of FIG.
- FIG. 15 is an explanatory diagram of defect detection data and log data in which the mask data bit is not set and the log selection value bit is set and registered in the log.
- Fig. 15 (A) shows defect detection data. Defect detection data 86, 88, and 90 are obtained sequentially.
- the number “l (080h)” shown below the defect detection data 86 is the number of words of the defect detection data at the first number “1”, and the next “(080h)” is the defect detection data in hexadecimal. It is itself.
- the defect detection data 86 is followed by 5 words of no defect data, followed by 2 words of defect detection data 88, which is “2 (060h)” in hexadecimal.
- the log data 92 that has been rounded in this defect length extension process has a word length of 1 word for defect detection data 86, 5 words for data without defects, and 2 words for defect detection data 88. It becomes 8 words with a word. Also, the log data content is obtained by adding defect detection data 86 and defect detection data 88.
- the defect detection data 90 becomes log data as it is.
- FIG. 16 is an explanatory diagram of defect detection data and log data whose log registration is excluded by mask data.
- defect detection data 94, 96, 98 in Fig. 16 (A) (140h) of defect detection data 96 is ANDed with the mask data 82 in Fig. 14 (B), the calculation result does not become "0"
- the remaining defect detection data 94 and 98 are directly used as log data 94 and 98 as a mask target.
- FIG. 17 is an explanatory diagram of defect detection data and log data that are excluded from log registration because the log selection value 84 is not set. If the AND of the defect detection data 100, 102, and 104 in Fig. 17 (A) is calculated with the mask data 82 in Fig. 14 (B), the calculation result is "0". It will not be excluded.
- FIG. 18 is an explanatory diagram of defect detection data and log data that are rounded by expanding continuous defect detection data.
- the defect detection data 106 and 108 are continuous, and the defect detection data 110 and 112 are continuous over 10 words of the data having no defect.
- the log data is 114 by rounding the data from 1 into 1 and the content is 2 words.
- the defect detection data 110 has no mask data bit set and the log selection value bit is set. If the bit of the log selection value is set, it is excluded from the log target.
- FIG. 19 is an explanatory diagram of defect detection data and log data adjacent to each other within 5 words where the defect length extension count is a threshold value.
- the defect detection data 116, 118, and 120 in FIG. 19 (A) are not all masked and are all logged because the log selection value bit is set. Furthermore, the defect length extension count L from the defect detection data 116 to the defect detection data 120 is
- defect detection data 118 is expanded and the three pieces of defect detection data 116, 118, 120 are registered as log data 122 rounded into one.
- This log data 122 has a word length
- FIG. 20 is an explanatory diagram of defect detection data and log data adjacent to each other exceeding the defect length extension count threshold.
- Defect detection data 124, 126, and 128 in Fig. 20 (A) have a defect length extension count.
- defect detection data 126 is excluded from the log target because there is no set bit of the log selection value, and the log data becomes two defect detection data 124 and 128.
- FIG. 21 is an explanatory diagram of log registration when defect detection data having mask data bits exists in continuous defect detection data.
- the bit of the mask data 82 in FIG. 12B is set in the defect detection data 132 at the center. Since the defect detection data 132 is excluded from the log target as a mask target, the log data shown in FIG. 21B becomes two defect detection data 130 and 134.
- FIGS. 22 and 23 are flowcharts of the defective sector map creation process by the processor 12 of FIG.
- the defective sector map creation process is executed in a state where the registration log information 66 is stored in the log area 64 as shown in FIG.
- initial sector size setting, track number initialization, and frame number initialization are performed in step S1. For example, when 512 bytes and 520 bytes are supported as the sector length, for example, a sector size of 512 is set as an initial value.
- step S2 the first frame is searched for the registration log information, and the start and end positions of the virtual sector are calculated in the frame in step S4 via the bit of the last frame in step S3.
- step S5 the first one word of the log information power is read. This first word is either the frame start mark 64-1 or the defect start position 72-1 in FIG.
- defect start position 72-1 is the position indicated by the index address pointer stored at the time of log creation.
- step S6 it is checked whether or not the read position is “OxFFFF” indicating a frame start mark. If no effort is made at the frame start position, the value read at step S5 is the defect start position 72-1 at the beginning of entry 78-1 in Fig. 12, for example, so the process proceeds to step S7. Read a word.
- step S8 it is checked whether the defect type is a registration target. If the defect type is a registration target, the process proceeds to step S9, where the defect position and the defect length are converted into virtual sector numbers in the frame. In step S10, the total defect number is updated for each virtual sector in the frame.
- step S5 one word is read from the log information, and the processing of steps S6 and S10 is repeated.
- step S6 the frame start mark at the head of the next frame is determined in step S6 in step S6.In this case, the process proceeds to step S11, and the total number of defects for each virtual sector in the frame. For each sector checked in step S13 until all virtual sectors in the frame are checked in step S12. Check if the total defect count power 3 ⁇ 4cc correction threshold is exceeded, and if so, register as a defective sector in step S14.
- step S11—S14 The processing of step S11—S14 is repeated until all the virtual sectors in the frame are checked in step S12. When the check is completed, the process proceeds to step S15. After the frame number is incremented, the process ends in step S3. Check whether the frame is strong. If it is not the final frame, repeat steps S4 to S14 for the next frame.
- step S3 If it is determined in step S3 that the frame is the final frame, the process proceeds to step S16 in Fig. 23 to determine whether or not the force has been checked up to the final track. If it is not the final track, the track number is incremented in step S17. Then, the process returns to step S2 to repeat the defective sector map creation process for the next track.
- step S16 in Fig. 23 If it is determined in step S16 in Fig. 23 that the end of the last track has been checked, the process proceeds to step S18. If it is satisfied, the process proceeds to step S21, and the defective sector map creation process is terminated as normal termination.
- step S19 If the total number of defective sectors does not satisfy the required device capacity in step S18, the process proceeds to step S19 to check whether the sector length can be changed. If the sector length can be changed from 512 bytes, which is the initial sector size in step S1, to 520 bytes, which is another sector length, for example, proceed to step S20 to change the track number after changing the sector length. After the initialization and the frame number initialization, the process returns to step S20 in FIG. 23 to repeat the process of creating a defective sector map for the same log information target with the changed sector length as the virtual sector.
- step S19 If the sector length cannot be changed in step S19, the process ends abnormally in step S22.
- the creation process of the defective sector map shown in FIG. 22 and FIG. 23 is performed as shown in the time chart of FIG. 10 and the processor flowchart of FIG. In parallel with this, a defective sector map is created for the log information obtained for the previous track.
- a defective sector map is created by initializing a specific sector size among a plurality of sector sizes. Create a defective sector map that shows the byte distance to the defect position from the index cover without setting the size, and save it in the media system area. Then, set the sector size and set the sector-compatible defective sector map. You can also make it.
- the present invention provides a program for defect check processing executed by the processor 12 provided in the magnetic disk control device of FIG. 2, and this program includes the flowchart of FIG. 11 and FIG. Thus, each processing content of the flowchart of FIG. 23 is obtained.
- the present invention includes appropriate modifications that do not impair the object and advantages thereof, and is not limited by the numerical values shown in the above embodiments.
- the above embodiment is an example of a magnetic disk device used as a hard disk drive.
- the present invention can be applied as it is to an appropriate storage device that requires a defect check of a medium.
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Abstract
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Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007504588A JPWO2006090454A1 (ja) | 2005-02-24 | 2005-02-24 | 記憶装置、欠陥チェック方法及びプログラム |
| PCT/JP2005/003004 WO2006090454A1 (ja) | 2005-02-24 | 2005-02-24 | 記憶装置、欠陥チェック方法及びプログラム |
| US11/880,171 US20070263313A1 (en) | 2005-02-24 | 2007-07-20 | Storage apparatus, defect check method, and program |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2005/003004 WO2006090454A1 (ja) | 2005-02-24 | 2005-02-24 | 記憶装置、欠陥チェック方法及びプログラム |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US11/880,171 Continuation US20070263313A1 (en) | 2005-02-24 | 2007-07-20 | Storage apparatus, defect check method, and program |
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| WO2006090454A1 true WO2006090454A1 (ja) | 2006-08-31 |
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| PCT/JP2005/003004 Ceased WO2006090454A1 (ja) | 2005-02-24 | 2005-02-24 | 記憶装置、欠陥チェック方法及びプログラム |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20070263313A1 (ja) |
| JP (1) | JPWO2006090454A1 (ja) |
| WO (1) | WO2006090454A1 (ja) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7813067B1 (en) * | 2007-02-14 | 2010-10-12 | Marvell International Ltd. | Accumulator for non-return to zero (NRZ) linear feedback shift register (LFSR) in controller for disk drive |
| US20100085848A1 (en) * | 2008-10-07 | 2010-04-08 | Mediatek Inc. | Method for performing track-seeking in an optical disk drive |
| US8040625B1 (en) | 2009-03-06 | 2011-10-18 | Western Digital Technologies, Inc. | Condensing a defect scan log for a disk of a disk drive |
| KR20110048776A (ko) * | 2009-11-03 | 2011-05-12 | 삼성전자주식회사 | 기록매체의 디펙 처리 방법과 이를 적용한 데이터 저장 장치 및 저장매체 |
| US8345367B1 (en) | 2010-12-23 | 2013-01-01 | Western Digital Technologies, Inc. | Recording defects on a hard drive |
| US9236085B1 (en) * | 2013-02-28 | 2016-01-12 | Western Digital Technologies, Inc. | Method and apparatus for performing a defect process on a data storage device |
| JP2022038290A (ja) * | 2020-08-26 | 2022-03-10 | 株式会社東芝 | 磁気ディスク装置 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0454067U (ja) * | 1990-09-11 | 1992-05-08 | ||
| JPH0562360A (ja) * | 1991-09-05 | 1993-03-12 | Fujitsu Ltd | 回転型記憶装置の欠陥セクタ処理方式 |
| JPH09145634A (ja) * | 1995-11-21 | 1997-06-06 | Sony Corp | 欠陥検出方法及び装置、並びに光学的情報記録媒体 |
| JP2000155901A (ja) * | 1998-11-17 | 2000-06-06 | Fujitsu Ltd | 欠陥情報作成方法及び情報記憶装置 |
| JP2001023313A (ja) * | 1999-07-06 | 2001-01-26 | Fujitsu Ltd | 情報記憶装置及び欠陥情報管理方法 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07122047A (ja) * | 1993-09-02 | 1995-05-12 | Toshiba Corp | 磁気ディスク装置 |
| KR100527238B1 (ko) * | 1997-07-26 | 2006-02-08 | 삼성전자주식회사 | 소프트 디펙 검출을 통한 데이타섹터 재할당방법 |
| US6292317B1 (en) * | 1999-09-02 | 2001-09-18 | Maxtor Corporation | Method and apparatus for performing a flaw scan of a disk drive |
| US6982849B2 (en) * | 2000-09-14 | 2006-01-03 | Samsung Electronics Co., Ltd. | Method and apparatus for providing positional information on a disk |
| US20020191319A1 (en) * | 2001-04-12 | 2002-12-19 | Seagate Technology Llc | Merged defect entries for defects running in circumferential and radial directions on a disc |
| SG106645A1 (en) * | 2001-04-26 | 2004-10-29 | Seagate Technology Llc | User data wedge media certification in a disc drive data handling system |
-
2005
- 2005-02-24 WO PCT/JP2005/003004 patent/WO2006090454A1/ja not_active Ceased
- 2005-02-24 JP JP2007504588A patent/JPWO2006090454A1/ja not_active Withdrawn
-
2007
- 2007-07-20 US US11/880,171 patent/US20070263313A1/en not_active Abandoned
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0454067U (ja) * | 1990-09-11 | 1992-05-08 | ||
| JPH0562360A (ja) * | 1991-09-05 | 1993-03-12 | Fujitsu Ltd | 回転型記憶装置の欠陥セクタ処理方式 |
| JPH09145634A (ja) * | 1995-11-21 | 1997-06-06 | Sony Corp | 欠陥検出方法及び装置、並びに光学的情報記録媒体 |
| JP2000155901A (ja) * | 1998-11-17 | 2000-06-06 | Fujitsu Ltd | 欠陥情報作成方法及び情報記憶装置 |
| JP2001023313A (ja) * | 1999-07-06 | 2001-01-26 | Fujitsu Ltd | 情報記憶装置及び欠陥情報管理方法 |
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| US20070263313A1 (en) | 2007-11-15 |
| JPWO2006090454A1 (ja) | 2008-07-17 |
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