KR20090011247A - The method for generating disk defect list, the storage medium having the disk defect list, and the method for controlling hard disk drive - Google Patents

Abstract

A disc defect list production method, a disc defect list storage medium and a hard disk drive control method are provided to manage defect effectively without increasing the size of the storage medium by storing the defect in the range of the track. A disc defect list production method comprises a non-continuous defect area detection step for extracting the case that n or more defect tracks, including a fixed number of defect sectors, exist in continuous m tracks, where m is natural number and n is natural number smaller than m, and storing the range of the m tracks in an area defect list(S508), a continuous defect area detection step for extracting the case that the defect track is continued over k and storing the range of the continuous defect track in the area defect list(S510), and a defect track detection step for extracting the defect track and storing it in a defect track list.

Description

The method for generating disk defect list, the Storage medium having the disk defect list, and the Method for controlling hard disk drive}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to defect management of a hard disk drive, and more particularly, a method for generating a disk defect list, a disk defect list storage medium, and a method for controlling a hard disk drive, which reduces the size of a defect list of a hard disk drive. It is about.

A hard disk drive is a device that magnetizes a disk surface to store information. The hard disk drive stores information on at least one disk.

There may be defects on the disc. The defects on the disc are largely raw material defects and fairness defects.

Raw material defects are a phenomenon in which magnetization is not normal due to physical defects on the disk surface. Ideally, even if the entire area of the disc is uniform, raw material defects will not be a problem, but in reality, even if the surface of the disc is subjected to precise machining, physical defects may occur in some areas, resulting in areas that cannot be magnetized normally. Defect occurs. At the location where raw material defect occurs, wrong magnetization may occur when recording information, and wrong information may be recorded, or wrong data may be read when reading information.

Fairness defect refers to the occurrence of defects due to scratches on the surface of the disk during the disc manufacturing process, assembling of the hard disk drive, or during operation of the hard disk drive. If a fairness defect occurs, there is a portion where the accuracy of recording on the servo track is reduced or the interference between the tracks is severe. This can lead to errors in writing or reading to tracks in the wrong position other than the position specified by the access address.

In order to prevent an error from occurring due to data being recorded or read out from the defect, defect management is required at the position where the defect is located so as not to record and read the data.

Disclosure of the Invention The technical problem to be solved by the present invention is to specify a region of a track recognized as a defect in storing a list of defects existing on the disk, and to reduce the size of the storage medium storing the defect by storing the same. The present invention provides a creation method, a disk defect list storage medium, and a hard disk drive control method.

Disc defect list generation method according to the present invention for achieving the above technical problem is that the number of defect tracks containing more than a predetermined number of sectors in the m (m is a natural number) of tracks in a continuous m (m is a natural number) Discontinuous defect region detecting step of extracting a case where there are more than one) and storing a range of the m consecutive tracks in an area defect list; And extracting a case where the defect tracks are continuous in k or more and storing a range of the k or more defect tracks in the region defect list.

The method may further include a defect track detection step of extracting the defect track and storing the defect track in a defect track list. In this case, the step of detecting the non-continuous defect region extracts the case where there are n or more defect tracks in the consecutive m tracks from the list of defect tracks, and the step of detecting the continuous defect region includes: Extract the case where more than k defect tracks are consecutive from the defect track list. The discontinuous defect area detecting step and the continuous defect area detecting step may detect a defect area from the defect track list and delete tracks belonging to the defect area from the defect track list.

The method may further include a defect sector detecting step of storing the track number and the sector number of the defect existing on the disk in the defect sector list. In this case, the defect track detection step extracts the defect track from the defect sector list. The defect track detecting step may extract the defect track from the defect sector list and delete the track number and the sector number of the defect belonging to the defect track from the defect sector list.

Advantageously, said region defect list indicates said range of tracks by a starting track number and an ending track number of said ranges.

The area defect list, the defect track list, and the defect sector list may further include a number indicating which disk surface among a plurality of disk surfaces.

In the disk defect list storage medium according to the present invention, the continuous track in which m (m is a natural number) tracks including n or more defect tracks including a predetermined number of sectors having defects in a plurality of tracks (m is a natural number) An area defect list for storing a range of m defect tracks; And a defect track list for storing track numbers of the defect tracks not included in any of the ranges included in the region defect list. The region defect list may further include a range of the consecutive k or more tracks in which the defect tracks exist in k or more consecutively.

Preferably, the region defect list may indicate the range of the tracks by the start track number and the end track number of the range.

The apparatus may further include a defect sector list storing the track number and the sector number of defects existing on tracks not included in the area defect list and the defect track list.

The area defect list, the defect track list, and the defect sector list may further include a number indicating which disk surface among a plurality of disk surfaces.

In the method for controlling a hard disk drive using a disk defect list storage medium according to the present invention, when an access address consisting of a track number and a sector number is input, m tracks of the track address of the access address are consecutive (m is a natural number). One of the ranges in the region defect list storing a range of the m consecutive tracks in which at least n defect tracks containing at least a certain number of sectors having defects exist. A defect determination step of determining whether the defect address is included; And if the access address is a defect address, outputting a defect control signal indicating that the access address is an address at which the defect exists. The region defect list further includes the range of the contiguous k or more of the tracks in which the defect tracks are present in the contiguous k or more.

Preferably, the region defect list may indicate the range of the tracks by the start track number and the end track number of the ranges of the tracks.

The determining whether the defect is in the defect track list storing the track number of the defect track, wherein the track number of the access address is not included in one of the ranges included in the region defect list. The method may further include determining whether the defect address is included in one of the track numbers.

In addition, the determining whether the defect,

Each of the track number and the sector in the defect sector list storing the track number and the sector number of a defect existing on a track not included in the area defect list and the defect track list. The method may further include determining whether the defect address is included in one of the numbers.

As described above, the method for generating a disk defect list, the disk defect list storage medium, and the method for controlling a hard disk drive according to the present invention store the defect as a range of tracks even if the address on the disk where the defect exists is increased. Accordingly, there is an advantage that the defect management of the hard disk drive can be effectively performed without increasing the size of the storage medium for storing the disk defect list.

DETAILED DESCRIPTION In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a diagram showing the structure of a hard disk drive.

1 shows a disk 102, a head 104, and a suspension 106 of a hard disk drive. The hard disk drive detects the information of the magnetized disk 102 with the head 104 to read recorded data, or magnetizes the disk surface with the head 104 to record the data.

The disc 102 is distinguished in position on the disc by a track and a sector. The track is provided in the form of concentric circles on the disk. Each track is arranged at regular intervals. A sector is an area partitioned at the same angle from the center of the disk 102. The location on the disc can be defined by track number and sector number.

The disk 102 may be provided in plurality, and may be provided in one or both sides. Each of the surfaces of the plurality of disks 102 is provided with a separate head 104, and data recording and reading of the surfaces of the disks 102 are performed. When indicating the position on the disc 102, which disc 102 surface is indicated by the head number.

The hard disk drive uses the spindle motor and voice coil motor to move the head 104 to the desired position. The disk is rotated with a spindle motor and the head 104 is moved with a voice coil motor to access the desired position on the disk. The head 104 may access tracks and sectors to be accessed using servo information stored on the disk.

Recently, hard disk drives are on the rise. With the increase in capacity of hard disk drives, the track and sector sizes become smaller. As tracks and sectors become smaller in size, even more defects of the same physical size affect more tracks and sectors.

The hard disk drive preemptively stores the track number and sector number of the location where the defect exists, and avoids the location on the defective disk by determining whether there is a defect in the access address during the recording or reading process. At this time, due to the high capacity of the hard disk drive, more tracks and sectors with defects exist, and the storage media required for storing the defect list in which the track number and sector number of the defects exist in advance are stored. Dose is increased. Consequently, it is necessary to increase the capacity of the buffer for storing the defect list or to increase the area on the disk storing the defect list.

In order to solve the problem of increasing the capacity of the storage medium storing the disk defect list as the hard disk capacity increases, the present invention stores a range of tracks in which the defect exists in storing the defect list. do. The idea of the present invention will be described in detail with reference to FIGS. 2A to 4B.

2A to 2B are diagrams showing a defect sector list according to the present invention.

2A shows sectors on track N on the disc. The darker part of these is where the defect is. Since hard disk drives should avoid accessing the point where defects exist during recording and reading operations, a list of defects is created in advance during burn-in testing of hard disk drives. Stored on media and defects managed. Hard disk drives avoid accessing defects by referring to their defect list during operation.

2B is a diagram showing a defect sector list storing track numbers and sector numbers of respective defects. Each defect is identified by its track number and sector number, as shown in Fig. 2B. However, with the increase of the capacity of the hard disk drive, it is required to increase the capacity of these defect lists and to increase or increase the number of storage media storing them. In order to manage many defects, a method of managing defects in track units has been devised.

3A to 3B are diagrams showing a defect track list according to the present invention.

If both the track number and the sector number of each defect are specified, the capacity of the defect list increases rapidly as the capacity of the hard disk drive increases. Therefore, when there are more than a predetermined number of sectors in which a defect exists in one track, the entire track is determined to be a defect and is defined as a defect track and stored in the defect track list. At this time, it is not necessary that all of a predetermined number or more of sectors having defects be adjacent to each other.

A process of determining a defect track and generating a defect track list will be described with reference to FIGS. 3A and 3B. When the number of sectors in which defects exist on one track exceeds a, such a track is defined as a defect track. Referring to track N of FIG. 3A, defects exist in a + 2 tracks. This is stored in the defect sector list by specifying each track number and sector number. In this case, define track N as the defect track, store track number of track N in the defect track list, and track N on the track N in the defect sector list. Delete all existing defects. This reduces the a + 2 defect information in the defect sector list. In addition, since the defect track list only needs to specify the track number, one defect information stored in the defect track list has a smaller capacity than one defect information stored in the defect sector list.

4A to 4B are diagrams illustrating region defect lists according to the present invention.

According to the present invention, when there are n or more defect tracks in m consecutive tracks using information of the defect track list in which the defect track list is stored (404), all m consecutive tracks are determined as defect tracks. And manage the defect by storing a range of m consecutive tracks in the region defect list. At this time, the tracks stored in the region defect list are deleted from the defect track list. For example, when there are seven or more defect tracks among ten consecutive tracks, the range of these ten consecutive tracks is specified and stored in the region defect list. Referring to the case of reference numeral 404 of FIG. 4A, seven tracks among ten consecutive tracks are defect tracks. Therefore, the range of track N-5 (Track N-5) to track N + 4 (Track N + 4) of FIG. 4A is stored in the region defect list and the range stored in the region defect list in the defect track list. Delete the tracks belonging to it. The track range may be specified by storing a track number (Start Track #) of a start track and a track number (End Track #) of an end track as shown in FIG. 4B.

The parameters m and n, which are the criteria for extracting the range of tracks included in the defect sector list, should be adjusted so that an excessive number of tracks are not stored as defect tracks.

In addition, when there are defect tracks in which more than k track numbers are consecutive in the defect track list, the defects are managed by storing a range of k or more consecutive tracks in the area defect list. At this time, the tracks stored in the region defect list are deleted from the defect track list. For example, if there are four or more consecutive defect tracks in the defect track list, the range of these tracks is stored in the region defect list and deleted from the defect track list. Referring to the case of reference numeral 402 of FIG. 4A, four consecutive tracks from track N to track N + 3 are defect tracks. Therefore, since four or more consecutive tracks are defect tracks, the range of tracks N to N + 3 is stored in the region defect list and the tracks are deleted from the defect track list. The track range may be specified by storing a start track number (Start Track #) and an end track number (End Track #) as shown in FIG. 4B.

In this case, defects can be managed by designating all tracks in a certain area as defects, so that defects that grow rapidly as the capacity of the hard disk drive increases can be effectively avoided without the addition of a storage medium storing a defect list. Can manage

5 is a flowchart illustrating a method of generating a disk defect list according to the present invention.

The disc defect list generating method according to the present invention generates an area defect list, a defect track list, and a defect sector list. A process of generating an area defect list, a defect track list, and a defect sector list will be described with reference to FIG. 5.

The defect is searched for all positions on the disk, and the track number and sector number of the point where the defect is located are stored in the defect sector list (S502). In this case, when there are a plurality of disks, the disk number may further include a head number specifying the disk surface in the defect sector list. The defect sector list is generated as shown in FIG. 2B.

From the defect sector list, tracks with more than a predetermined number of defects are extracted, and the track numbers of these tracks are stored in the defect track list (S504). Defects corresponding to the track number stored in the defect track list are deleted from the defect sector list (S506). As described with reference to Figs. 3A to 3B, if a defect exists in one or more sectors in one track, the track is stored in the defect track list and deleted from the defect sector list.

Next, the system detects a case where there are n or more defect tracks in m consecutive tracks from the defect track list, and stores the range of the corresponding m consecutive tracks in the area defect list. In addition, tracks belonging to the range stored in the region defect list are deleted from the defect track list (S508).

It also finds k or more consecutive defect tracks in the defect track list, and stores the range of the corresponding consecutive k tracks in the area defect list. In addition, tracks belonging to the range stored in the region defect list are deleted from the defect track list (S510).

The range stored in the region defect list may be defined by specifying a start track number (Start Track #) and an end track number (End Track #) as shown in FIG. 4B.

Also, the area defect list, the defect track list, and the defect sector list may include a head number indicating which disk surface when the hard disk drive has a plurality of disk surfaces.

Area defect lists, defect track lists, and defect sector lists are created and stored on disk or on a separate storage medium on the hard disk drive, which can be used to access the defective address when writing or reading data. You can manage defects to avoid this. Hereinafter, a method of controlling a hard disk drive using an area defect list, a defect track list, and a defect sector list will be described with reference to FIGS. 6 to 7.

6 is a diagram showing the structure of a hard disk drive.

6 shows a part for adjusting the position of the head 104 in the hard disk drive. The hard disk drive outputs a control signal for adjusting the position of the head 104 from the controller 604 and the motor controller 606, and uses the voice coil motor 608 and the spindle motor 610 to control the head 104. Move it.

The hard disk drive controller 604 outputs an access address for writing or reading to the motor controller 606. The motor controller 606 outputs a control signal to the voice coil motor 608 and the spindle motor 610. The voice coil motor 608 rotates the suspension 106 and the head 104 about the axis of the head gimbal assembly (not shown). Spindle motor 610 rotates the disk about the axis in the center of the disk. Operation of voice coil motor 608 and spindle motor 610 causes head 104 to access a location on disk corresponding to an access address to record or read data.

When the control unit 604 outputs the access address to the motor control unit 606, the control unit controls to prevent access to the address where the defect exists by referring to the list of defects stored in the defect list storage medium 602. A control method will be described with reference to FIG. 7.

7 is a flowchart illustrating a hard disk drive control method according to the present invention.

The control unit 604 determines the access address for recording or reading and refers to the defect list in the defect list storage medium 602.

First, it is determined whether the track number of the access address is included in any one of the track ranges in the region defect list by comparing the access ranges with the track ranges in the region defect list (S702). When the track number of the access address is included in any one of the track ranges in the area defect list, the controller 604 does not perform a write or read operation on the access address, and indicates that the address has a defect. The defect control signal is output (S710). The defect control signal may be a control signal for approaching another address or a control signal for notifying that an error has occurred.

If the access address is not included in the region defect list, the controller 604 may refer to the defect track list to determine whether the track number of the access address matches any of the track numbers in the defect track list. It is determined (S704). If the track number of the access address matches any one of the track numbers stored in the defect track list, the controller 604 outputs the defect control signal (S710).

If the access address is not included in the defect track list, the controller 604 determines whether the access address matches any one of the addresses in the defect sector list by referring to the defect sector list (S706). ). If the access address matches any one of the track numbers stored in the defect sector list, the controller 604 outputs the defect control signal (S710).

If the access address is not included in the defect sector list, the controller 604 outputs the access address to the motor controller 606 (S708). The motor controller 606 outputs a control signal to the voice coil motor 608 and the spindle motor 610, and the voice coil motor 608 and the spindle motor 610 move the head 104 to the approach address so as to transmit data. Record or read.

As described above, optimal embodiments have been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a diagram showing the structure of a hard disk drive.

2A to 2B are diagrams showing a defect sector list according to the present invention.

3A to 3B are diagrams showing a defect track list according to the present invention.

4A to 4B are diagrams illustrating region defect lists according to the present invention.

5 is a flowchart illustrating a method of generating a disk defect list according to the present invention.

6 is a diagram showing the structure of a hard disk drive.

7 is a flowchart illustrating a hard disk drive control method according to the present invention.

Claims (17)

The range of m consecutive tracks is extracted by extracting a case where there are n or more defect tracks containing a predetermined number of defects in m consecutive tracks (m is a natural number). Discontinuous defect area detecting step of storing in the area defect list; And And extracting a case in which the defect tracks are consecutive for at least k, and storing a range of the at least k consecutive defect tracks in the region defect list. The method of claim 1, Defect track detection step of extracting the defect track and stored in the defect track list, further comprising: The discontinuous defect area detecting step may include extracting a case where there are n or more defect tracks in the m consecutive tracks from the defect track list. The continuous defect region detecting step may include extracting a case in which k or more defect tracks are continuous from the defect track list. The method of claim 2, The non-contiguous defect area detecting step and the continuous defect area detecting step may include detecting a defect area from the defect track list and deleting tracks belonging to the defect area from the defect track list. How to create a fact list. The method of claim 2, A defect sector detecting step of storing a track number and a sector number of a defect existing on the disc in a defect sector list, The defect track detecting step may include extracting the defect track from the defect sector list. The method of claim 4, wherein The defect track detecting step may include extracting the defect track from the defect sector list and deleting a track number and a sector number of a defect belonging to the defect track from the defect sector list. How to create a fact list. The method according to any one of claims 1 to 5, And wherein the area defect list indicates the range of the tracks by the start track number and the end track number of the ranges of the tracks. The method according to any one of claims 1 to 5, And the area defect list, the defect track list, and the defect sector list further include a number indicating which one of a plurality of disk surfaces is a disk defect list. Storing a range of the m consecutive defect tracks in which m (m is a natural number) tracks having at least n defect tracks containing at least a predetermined number of sectors having defects. Region defect list; And And a defect track list for storing track numbers of the defect tracks not included in any of the ranges included in the area defect list. The method of claim 8, wherein the region defect list, And the range of the contiguous k or more of said tracks, wherein said defect tracks are present in contiguous k or more. The method of claim 8, wherein the region defect list comprises: And a range of the tracks as a start track number and a end track number of the range of tracks. The method according to any one of claims 8 to 9, And a defect sector list for storing the track number and the sector number of defects existing on tracks not included in the area defect list and the defect track list. The method according to any one of claims 8 to 9, And the area defect list, the defect track list, and the defect sector list further include a number indicating which one of a plurality of disk surfaces is a disk defect list storage medium. A method for controlling a hard disk drive using the disk defect list storage medium of claim 8, When an access address consisting of a track number and a sector number is input, a defect track including n or more defect tracks containing a predetermined number of defects in m tracks in which the track number of the access address is continuous (m is a natural number) A defect determination step of determining whether or not a defect address is included in one of the ranges in an area defect list storing a range of the m consecutive tracks which are smaller than a natural number; And And if the access address is a defect address, outputting a defect control signal indicating that the access address is an address in which the defect exists. The method of claim 13, wherein the region defect list, And the range of the contiguous k or more tracks, wherein the defect tracks are present in contiguous k or more. The method according to any one of claims 13 to 14, wherein the region defect list, And the area defect list indicates the range of the tracks by the start track number and the end track number of the ranges of the tracks. The method according to any one of claims 13 to 14, wherein the determining whether the defect is, The track number of the access address is included in one of the track numbers in a defect track list that stores a track number of the defect track that is not included in one of the ranges included in the region defect list. And determining whether the address is the defect address. The method according to any one of claims 13 to 14, wherein the determining whether the defect is, Each of the track number and the sector in the defect sector list storing the track number and the sector number of a defect existing on a track not included in the area defect list and the defect track list. And determining whether the defect address is included in one of numbers.

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