JP2695212B2 - Recording track forming method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention provides information for forming a management area for managing defects in a data area without providing a defect free zone in the data area. The present invention relates to a method of forming a recording track of a recording / reproducing device.

[Prior Art] There are various types of storage devices such as computers.
One of them is a hard disk device having a large storage capacity, quick access, and a small size. This hard disk device rotates a magnetic disk having a magnetic recording layer formed on the surface of a hard disk such as aluminum at a high speed (for example, 2450 rotations), and brings a magnetic head close to the surface of the magnetic disk at a minute interval (for example, 2450 rotations). , 0.2 ~
Recording / playback is performed in the state of 0.5 micron.

FIG. 3 shows an example of this type of disk device. In FIG. 3, a magnetic head 2 is arranged so as to be accessible to each of the front and back surfaces of a plurality of magnetic disks 1 for recording information. Each of the magnetic disks 1 rotates integrally with a direct drive motor (hereinafter referred to as a DD motor) 3 as a drive source. Also, the magnetic head 2 is equal to the number of magnetic disks 1
The number of voice coil motors (Voice Coil Motor, hereinafter referred to as VC) connected to the swing arm 4 is increased.
The magnetic disk 1 can be moved in the radial direction.

A head amplifier 6 is connected to each of the magnetic heads 2,
The recording information from the drive circuit 8 is amplified and the servo information and the like from the magnetic head 2 are amplified. The servo circuit 7 is used to control the VCM5 servo based on this servo information.
Further, a drive circuit 8 for controlling the rotations of the DD motor 3 and the VCM 5 and transmitting / receiving a signal to / from the head amplifier 6 is also provided. Here, the servo circuit 7 controls the drive circuit 8. The drive circuit 8 is provided with a controller 9 for controlling the drive circuit 8, and an external host computer 11 is connected to the controller 9 via a signal line 12. Member numbers 1 to 9 above
The inside of the chained line frame consisting of
The controller constitutes a hard disk device of a type integrated with the disk device).

FIG. 4 is a plan view showing details of the structure of the embedded type hard disk device 10.

As shown in FIG. 4, a magnetic head 2 is arranged so that a pair of heads face each other across each surface of a plurality (for example, two) of magnetic disks 1, and a head having a swing arm 4 thereof is arranged. A drive mechanism 13 is provided. DD motor 3,
The swing arm 4, the VCM 5, and the head drive mechanism 13 are attached to a base plate 14 which serves as a base of a housing which holds each member in a sealed state with respect to the outside.

A printed circuit board (not shown) on which a motor drive circuit, a control circuit, etc. are mounted is attached to the base plate 14 via a frame (not shown). The head drive mechanism 13
A swing arm 4, a yoke 15 which holds a magnet (not shown) and rotatably supports the swing arm 4,
Coil 16 movably disposed in yoke 15, coil 16
And a swing arm shaft part 17 for supporting the swing arm 4, a shaft 18 for rotatably fixing the swing arm shaft part 17 to the frame side, and an FPC having one end connected to the swing arm shaft part 17. It comprises a regulation arm 18 and a solenoid 20 which engages the other end of the regulation arm 19 in accordance with the operation mode and regulates the rotation of the swing arm 4.

The housing for accommodating each of the above-mentioned members is composed of a base plate 14 and a top cover (not shown), and a gasket is used for a contact portion between the base plate 14 and the top cover and a mounting portion of the VCM 5 in order to keep airtightness. The shaft portion of the motor 3 is filled with magnetic fluid.

Next, the operation of the hard disk device having the above configuration will be described.

This type of disk drive device has a recording track in advance.
The excitation condition of the VCM 5 is stored in a memory (not shown) in the controller 9 including the CPU, and the magnetic head 2 can be positioned according to the driving state of the VCM 5. Therefore, when driving, the host computer 11
The drive circuit 8 selects one of the recording tracks to be recorded or reproduced in response to a command from the controller. In the process of tracking the recording track, a pair of servo signals formed in a zigzag pattern on the magnetic disk 1 are read out when the gear of the magnetic head 2 is located in the servo sector. The read servo signal is amplified by the head amplifier 6, and the drive circuit 8 controls the VCM 5 based on the servo signal output from the head amplifier 6 to move the magnetic head 2 in the radial direction of the magnetic disk 1. . By this control, the gap of the magnetic head 2 is positioned on the center of the track width of the recording track. Thereafter, the VCM 5 is driven every time a servo signal is detected, and the magnetic head 2 is always positioned on the track, so that data can be read or written stably.

By the way, when information is written to or read from the magnetic disk 1 in units of sectors, a defective sector in which an address or data becomes defective due to a defect in the magnetic disk 1 may be detected. As a management method in such a case, conventionally, the following means have been taken.

A method that uses an operating system (OS) (Fig. 5 (a)).

For example, when MS-DOS of Microsoft Corporation is used and the area for recording the file allocation table (FAT) is held in the data area of the magnetic disk 1 and a cluster including a defective sector is detected during information recording, A flag corresponding to the cluster is set and alternative recording is performed in the alternative area in the data area (details are described in JP-A-63-14379).

It is managed by a controller using a small computer system interface (SCSI). In this case, an alternative entry part is set in the data area and the management information is recorded there (FIG. 5 (b)).

An alternative management unit is set outside the data area (Fig. 5 (c)).

[Problems to be Solved by the Invention] However, in the conventional disk error management method, in the case of the above method, since the error handling error handling table, the alternative zone, etc. are provided in the data area. The existence of a defect free zone in the data area is required, and very wasteful management is required in manufacturing. Further, in the case of the above-mentioned method, although the substitution management unit may be rewritten in the future, it is out of the data area, and therefore rewriting is inconvenient.

For this reason, the disk device manufacturing plant is required to have no error in the data area at the time of shipping. However, according to the conventional error management method, wasteful management is required. Had been affected.

An object of the present invention is to solve such a problem of the conventional technology, to enable error management without the presence of a defect free zone in the data area, to simplify the manufacturing process, to improve the yield, and It is an object of the present invention to provide a method for forming a recording track of an information recording / reproducing apparatus which can reduce the cost.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for forming a recording track of an information recording / reproducing apparatus for forming a data track and a defect management track on an information recording medium. A defect-free recording track is found on the recording medium, the found defect-free recording track is set as a defect management track, and data tracks are sequentially formed from tracks adjacent to the set defect management track. I am trying.

[Operation] According to the present invention, since it is not necessary to confirm that a defect-free track exists in the data area, wasteful management for confirming the presence / absence of a defect unlike the conventional case is unnecessary, and the manufacturing process It is possible to simplify and improve the yield.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory view showing a cylinder structure of a hard disk device of the present invention.

The present invention focuses on the fact that the embedded hard disk directly connected to the internal bus has a high degree of freedom and has a margin to form a track outside the normal data area. The feature is that it is formed.

Specifically, the magnetic disk 1 is sought from the outermost peripheral portion to the inner side, a direct-free track having no defect even in one cylinder is found, and this track is set to -1 cylinder. Then, the track inside -1 cylinder is set to 0 cylinder to secure the data area. After that, the -1 cylinder is used as an alternative management unit to read and write the data area, and if a defect is detected at that time, the alternative process for the alternative area set separately is executed. . The -1 cylinder is formed within a few track widths between the outer guard band 30 and the normal 0 cylinder, as shown in FIG. Then, the data zone is set to the inside from the 0 cylinder.

When shipping the magnetic disk 1, the data section must be free from defects. In other words, the usage of the data zone viewed from the system side is various, depending on the manufacturer of the hard disk device and the user's system construction (for example, 0 to 3 tracks are in no error state). However, according to the present invention, since the data zone can be made apparently free from the system side at the time of shipment, it is possible to meet any request under the same conditions ( For example, it will be possible to operate even if a different OS is installed).

[Effects of the Invention] As described above, according to the present invention, since the defect-free recording track is set as the defect management track,
There is no need to manage the defective area of the defect management track,
The processing for that becomes unnecessary. Also, since it is not necessary to confirm that a defect-free track exists in the data area, there is no need to manage it for confirmation.
It is possible to simplify the manufacturing process and improve the yield.
Furthermore, since the data area can be made apparently defect-free when viewed from the system side, it is possible to cope with a variety of usages according to the system construction of the manufacturer or the user.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a cylinder structure of a hard disk device of the present invention, FIG. 2 is an explanatory view showing a formation position of a track for defect management according to the present invention, and FIG. 3 is an electric diagram of an example of a conventional disk device. FIG. 4 is a block diagram showing the system, FIG. 4 is a plan view showing the details of the structure of the embedded hard disk device, and FIGS. 5 (a), (b), and (c) are three examples of the conventional error management method of the disk. FIG. 1 ... magnetic disk, 2 ... magnetic head, 3 ... DD motor, 5 ... VCM, 7 ... servo circuit, 8 ... drive circuit,
9 ... Controller, 10 ... Hard disk device, 11 ...
… Host computer.

Claims (1)

(57) [Claims] 1. A method for forming a recording track of an information recording / reproducing apparatus for forming a data track and a defect management track on an information recording medium, wherein a defect-free recording track is found on the information recording medium, and the detected defect is found. A method for forming a recording track of an information recording / reproducing apparatus, characterized in that a free recording track is set as a defect management track, and the data tracks are sequentially formed from tracks adjacent to the set defect management track.