JPS63282971A - Disk driving device - Google Patents

Abstract

PURPOSE:To eliminate the need for a mechanical detecting means, such as a photosensor, etc., and to contrive miniaturization and shortening of seek time by writing a bit of positioning information not existing in order tracks into a write protection area of data region in its outermost circumferential recording track position. CONSTITUTION:A floatation undertaking region F is formed on a magnetic layer on the surface of a magnetic disk 1, and the region F consists of a guard band 1GB, an inhibitory zone 1, a data zone D, and a guard band OGB, whereas the outermost circumference of the zone D is made as zero track. The region F is divided into many sectors in its radial direction, and a sector adjacent to and on the down-stream of the rotating direction R side of an index signal detecting position 1D is written with a bit of servo information as a servo zone SZ, which area is not written as the write protection area. Then, a head 2 is positioned where the area can be specified by detecting such bits of positioning information as of eight tracks recorded on the band OGB, thus enabling the head 2 to be easily positioned in the zero track position from the OGB position.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a disk drive device that records and/or reproduces information on an information recording medium formed in a disk shape, and particularly relates to a disk drive device that records and/or reproduces information on an information recording medium formed in a disk shape. The present invention relates to a disk drive device suitable for a so-called hard disk device that accommodates a medium and rotates at high speed.

[Conventional technology]

Although various types of disk drive devices are known, hard type magnetic disks are often used, especially for devices that are small and require a large amount of information. In this type of magnetic disk drive device, since the rotational speed of the magnetic disk is fast and the recording density is high, improvement in seek speed and accuracy are particularly problematic. When seeking, the outermost 0 track position is used as a reference, so devices of the same type must detect the ○ track position with high precision.

An example of this type of hard disk device is shown in FIG. In the figure, the hard disk device includes a magnetic disk 1 for recording information, a magnetic head 2 for recording and reproducing information on the magnetic disk 1, and a direct drive motor (not shown) that rotationally drives the magnetic disk 1. (hereinafter abbreviated as DD motor), a head drive mechanism 4 for moving the magnetic head 2 to a predetermined track on the magnetic disk 1, and a casing that houses the magnetic disk 1, the magnetic head 2, etc. and maintains it in an airtight state. It mainly consists of a base plate 5 that serves as the base of the body, a printed circuit board 6 on which a motor drive circuit, a control circuit, etc. are formed, and a frame (not shown) for attaching the printed circuit board 6 to the base plate 5.

In this magnetic disk device, the magnetic disk 1 is
Two magnetic heads 2 are provided, and since double-sided recording is performed on one magnetic disk 1, one magnetic head 2 is provided on each surface, a total of four magnetic heads 2 are provided. It is attached via a support spring. The head drive mechanism 4 includes the swing arm 8, a steel belt 9 attached to a part of the swing arm 8, a pulley 10 around which the middle part of the steel belt 9 is wound, and a stepping motor 11. By inserting and fixing the boot IJ10, around which the steel belt 9 is wound, to the drive shaft 12 of the stepping motor 11, and driving the stepping motor 11, the swing arm 8 is moved to the rotation shaft 8a. It is possible to swing around the center.

Magnetic disk 1. Magnetic head 2. Swing arm 8. The casing that houses the steel belt 9, pulley 10, etc.
Consisting of the base plate 5 and a top cover (not shown), in order to maintain airtightness, a gasket is used at the contact area between the base plate 5 and the top cover and at the mounting area of the stepping motor 11, and a magnetic material is used at the shaft portion of the DD motor 3. Filled with fluid. Further, a shutter 17 is provided on the antimagnetic head mounting side 8b of the swing arm 8 so as to protrude outward. Further, a photointerrupter 18 is provided as an outside sensor on the airtight chamber 5a side of the base plate 5, and an insertion path 18 of the photointerrupter 18 is provided as an outside sensor.
The shutter 17 is arranged so as to be loosely inserted into the interior of the housing. In this conventional example, when the magnetic head 2 reaches the O track position on the outer periphery, the shutter 17 blocks the optical path formed in the insertion path 18a of the photointerrupter 18.

When restoring the 0 track, the magnetic head 2 is accessed at low speed and immediately stopped when the 0 track is reached.

This is because if the magnetic head 2 is accessed at high speed, even if it reaches the O track, it will not be able to stop on the O track and will lose synchronization.

[Problem that the invention seeks to solve]

By the way, since the track position of the head is unknown when the power is turned off, the 0 track restore is performed in order to always return the head to the O track, reset the track counter in the drive, and match the counter with the head position. In some cases, this is done to confirm the head position when a seek error occurs, and in other cases, it is simply sought to the O track. In either case, some means for detecting the O track position is required. As means for detecting the 0 track position, optical means as mentioned above or magnetic means which are often used when detecting from the rotation angle of a stepping motor are known, but with these mechanical means, It is necessary to provide the sensor close to the movement area or rotation area of the swing arm 8 and the stepping motor 11, and if miniaturization is promoted, it may become impossible to install the sensor, which has been an obstacle to miniaturization.

In addition, as a mechanical means, the rotating shaft of the stepping motor is extended to the anti-magnetic disk mounting side, a member extending in the outer circumferential direction is attached to the rotating shaft, and the 0 track position is detected from the rotating position of the member. However, since the member protrudes from the bottom side of the base plate 5, it becomes thicker.
There was a problem in that it was difficult to make it thin. Furthermore, with this configuration, dust inevitably enters the bearing portion of the stepping motor, leaving a problem in dustproofness.

In addition, as mentioned above, the track position may become unknown,
If a control method is used to accurately return the head to the O track position each time to check the head position, highly accurate O track restoration must be repeated each time the above situation occurs, resulting in zero There is a problem in that the head seek time including the track detection time is long.

This invention was made in view of the above technical background, and its objectives are to eliminate the need for mechanical detection means such as optical sensors, to be able to be made smaller and thinner, to have excellent dust resistance, and to reduce the head seek time. An object of the present invention is to provide a disk drive device that can shorten the time.

[Means for solving problems]

In order to achieve the above object, the present invention provides a disc-shaped information disc having a data area in which a recording track on which data is recorded and a guard band area located on the outer circumferential side of this data area and in which no data is recorded. A disk drive device comprising a recording medium, a rotation drive means for rotationally driving the information recording medium, a head device for writing or reading information on the information recording medium, and a transport means for transporting the head device. , at least in the write protect area of the outermost recording track position of the data area, positional information that is not written in other recording track positions is written.

[Effect]

According to the above means, the outermost recording track position of the data area, that is, the 0 track position, can be clearly distinguished and detected simply by reading the positional information through the head device.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

1 and 2 are for explaining the present invention in detail, and FIG. 1 is an explanatory diagram showing the relationship between recording tracks, servo information for center positioning of the tracks, and position information for detecting o-tracks. , FIG. 2 is an explanatory diagram showing the writing position of servo information on the magnetic disk. In the following description, components that are the same as or can be considered to be the same as those of the conventional example are given the same reference numerals.

In FIG. 2, a floating guaranteed area F is formed in the magnetic layer on the surface of the magnetic disk 1, and this flying guaranteed area F is further divided from the inner circumferential side to an inner guard band ICB, an inhibit zone (2) where data is not recorded, and an inhibit zone (2) where data is recorded. The outer guard band OGB is composed of a data zone D and an outer guard band OGB, and the outermost circumference of the data zone D is a zero track OT. The flying guaranteed area F of the magnetic disk 1 is also divided into a large number of sectors in the radial direction, and the index signal detection position W
The sector on the downstream side of the rotation direction R near the ID is the servo zone S
Servo information 1=lsV is written as Z. This area is a write protect area WPZ and cannot be written to.

As shown in FIG. 1, this servo information S is divided into a first region S Z + on the flow side and a second region S Z + on the downstream side in the rotation direction of the servo zone SZ in the direction of arrow R The position information OT1 for detecting the O track is written in the third area S73 on the downstream side.
．． ．． OTI,, OT1. .

0TI3. OT 14. OT I :,, OT
I b, OT I 7 is written. In this case, the position information may be only the information 91aOTID of the O track OT position corresponding to the outermost recording track of data zone D, but with the intention of shortening the 0 track detection time, The outer guard band OGB also has position information f4 for 8 tracks corresponding to one cycle of the stepping motor 11 from the OF/rack OT! O
T1. to 0T17 are assigned.

In addition, data zone D and inhibit zone (2) have a first region SZ when the stepping motor 11 is excited in one phase, which will be described later, and a second region S22 when the stepping motor 11 is excited in two phases.
Servo information S■ is written in advance in a staggered manner so as to correspond to the above.

Servo information S written in the first and second areas
V and location information OT1. ~0TI7 are the same signals, and only the written area and position are different.

Next, the operation when performing o-track restoration on the magnetic disk 1 configured as described above will be described.

Now, when a command to restore 0 tracks is issued from the central processing unit ff (CPU, not shown), the track position where the magnetic head 2 is currently located when receiving the command is first checked. By this confirmation operation, the location information ○T1. ~
When OTI is not detected, it means that the track is located in either the data zone D1 inhibit zone I or the inner guard band IGB on the inner circumferential side of the first track. In addition, only position information, that is, OTI in FIG. 1, ~○T1. When the position information with the symbol is detected, it means that the position information is located in the outer guard band OGB. Then, when the position information and the recording track are detected, the position information N0TI is obtained.

Corresponds to the grant track. This means that the track is located at position T.

Therefore, when the magnetic head 2 is located in the data zone D, inhibit zone I, or inner guard band IGH as a result of this confirmation operation, the 1023-pulse stepping motor 11 is sent to the outer circumferential side, for example, by a known buffer mode restore. The magnetic head 2 is positioned on the outer guard band OGB, the excitation phase of the stepping motor 11 at that time is memorized, and the presence or absence of position information is confirmed. At this time, the magnetic head 2 determines the outermost circumferential position of the outer guard band OGB using the position information OT1.
Since it is set to seek only up to the track position corresponding to the assigned track, it will always be located in one of the cycles on the outer circumferential side. Therefore, by establishing correspondence with the excitation phase as described above, it can be known which track position corresponds to which position information providing track the track position corresponds to. Therefore, if the number of step pulses corresponding to the difference between the o-track OT and the currently located track position is input thereafter, the track returns to the inner circumferential side by the number of tracks corresponding to the number of pulses and is located at the o-track OT. Then, at that track position, the magnetic head 2 is positioned at the center position of the O-track OT using the servo information SV, and o-track restoration is performed.

Furthermore, if it is initially located in the outer guard band OGB, the 0 track OT position is immediately known from the excitation phase information of the stepping motor 11 at that time, and the O track restoration is performed by the latter half of the operation. Furthermore, first,
If it is determined that it is located at the 0 track OT position,
Only servo control is performed to position the magnetic head 2 at the center of the o-track position using the servo information SV, and the o-track restoration is completed in an extremely short time.

Also, when the track on which the magnetic head 2 is located is confirmed by the track counter at the time of confirmation, the CPU outputs the number of pulses corresponding to the difference from the O track, and the pulse broadcast immediately positions the O track OT. can be done.

When the magnetic disk 1 is configured in this way, position information OT
Io~OT1. By simply detecting the area where the magnetic head 2 is located, it is possible to easily specify the area where the magnetic head 2 is located, furthermore, the magnetic head 2 can be easily positioned from the outer guard band OGB position to the 0 track OT position. Once the position inside is known, it can be transferred directly to the O-truck.

At this time, the signal system is position information @0TIo~OTI.

It is only necessary to add a configuration to detect this, and there is no need to significantly change the CPU program, and it can be handled by simply adding hardware. Further, when the position information is written and processed electrically in this way, the photointerrupter 18 and the shutter 17 protruding from the swing arms 1 and 8 shown in the conventional example of FIG. 3 become unnecessary. Further, a detection mechanism that operates in synchronization with the rotating shaft of the stepping motor 11 is also not required, making it possible to make the device smaller and thinner.

Although the above embodiment has been described using a hard disk drive as an example, the present invention is not limited to this type of magnetic disk. It goes without saying that the present invention is applicable to all systems, and that various control methods can be selected depending on the type of device and stepping motor. Furthermore, in the above embodiment, one period of the excitation phase of the stepping motor 11 is
Position information OT I o ~ OT I only about the tracks located on the outer circumferential side from the track OT? However, position information @OT1. is given only to the O track OT position. Even if it is given, the O-track OT can be easily identified. However, with the configuration as in the embodiment, the storage from the outer guard band OGB position to the 0 track OT can be performed in a shorter time. In addition, although the sector servo method is exemplified in the above embodiment, it goes without saying that the present invention can also be applied to a track servo method in which servo information is prepared only for a specific track.

〔Effect of the invention〕

As is clear from the above description, according to the present invention in which position information that is not written in other recording tracks is written in at least the 0 track, (1) there is no need for a mechanical detection means for the 0 track position; It is possible to promote miniaturization and thinning of magnetic disk drive devices. ■ Mechanical detection means have a limit in the resolution of the detection means, so there is a limit to how high the density can be handled, but electrical detection By adopting this method, it is possible to quickly respond to higher density. ■For the same reason as mentioned above, the attached part of the mechanical detection means does not communicate with the airtight room, so it is possible to improve dustproofness. , ■ Since positional information indicating the O track is written at the 0 track position, the ○ track can be directly detected by the head device, and 0 track restoration can be performed in a short time. ■ 0 track restoration can be performed in a short time. As a result, it is possible to shorten the overall seek time. ■ Also, by using electrical means, there is less risk of deterioration of accuracy or reliability due to aging deterioration, etc. , since no mechanical configuration is required, there is no need to adjust the position of the zero track, and together with a reduction in the number of parts, it is possible to reduce product costs.

[Brief explanation of drawings]

1 and 2 are for explaining the present invention in detail, and FIG. 1 shows the relationship between position information, servo information, and recording tracks written on a magnetic disk of a disk drive device according to an embodiment. FIG. 2 is an explanatory diagram showing each area of a magnetic disk, and FIG. 3 is a perspective view of a main part of a conventional hard disk drive. 1...Magnetic disk, 2...
...Magnetic head, 11...Stepping motor, D...Data zone, ■...
・・・・・・Inhibit zone, ○GB・・・・・・
・・・Outer guard band, IGB・・・・・・・・・
Inner guard band, OT...0 tracks, 0 TIO. OTl,,0TI2. OT 13. OT Ia
, OT Is. OTl,,0TI7・・・・・・Location information, SZ
...... Servo zone, SZl...
...First area, SZ2... Second area, SV... Servo information, WPZ...
Write protect area.

Claims (2)

[Claims] (1) A disk-shaped information recording medium having a data area in which a recording track on which data is recorded and a guard band area located on the outer circumferential side of this data area and in which no data is recorded; and this information recording medium. In a disk drive device comprising a rotation drive means for rotationally driving an information recording medium, a head device for writing or reading information on or from the information recording medium, and a transport means for transporting the head device, at least the outermost circumferential recording of the data area is performed. A disk drive device characterized in that position information that is not written in other recording tracks is written in a write protect area of a track position. (2) In claim (1), the transporting means is a stepping motor, and the position information is a write protect area at the outermost recording track position of the data area and a stepper motor from the outermost recording track position. A disk drive device characterized in that writing is performed at a track position in a guard band area corresponding to a position within one period of an excitation phase.