JP2605721B2 - Disk-shaped recording medium - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk-shaped recording medium in which servo areas and data areas are alternately formed along a disk rotation direction.

B. Summary of the Invention In the present invention, servo areas and data areas are alternately formed along the rotation direction of the medium, and each track in each group divided into a plurality of groups in the disk area in the servo area can be identified. In a disk-shaped recording medium on which a servo signal recording pattern is formed, a spare track having a servo signal recording pattern that is maintained in the disk radial direction from a recording track is located on the outer and inner peripheral sides of the recording track forming area. When the head is out of the range from the outermost track to the innermost track of the recording track, the head can be quickly pulled into the recording track range, and the target track can be moved quickly and accurately. The head can be easily accessed.

C. Prior Art In order to increase the recording density, particularly the track density, of a disk-shaped recording medium, it is necessary to increase the tracking accuracy of a recording / reproducing head. In order to increase the head tracking accuracy, it is first conceivable to increase the mechanical accuracy of the head feed mechanism of the recording / reproducing device. It is necessary to previously record a signal for tracking servo on the recording medium side, and to perform a tracking operation of the head by a so-called closed loop servo.

Here, FIG. 2 shows an example of a recording format in the case where the signals for tracking servo as described above are recorded in advance on the flexible magnetic disk 1 (a so-called floppy disk). In FIG. 2, the flexible magnetic disk 1 has a rotating direction (arrow R) on the disk.
Along the direction), servo areas S in which the servo signals are recorded and data areas D in which general data is recorded are alternately arranged. Each center line of the data recording track T _D of the data area D (one-dot chain line in the drawing), a plurality at a predetermined pitch p in the disk radial direction (arrow A direction) are arranged in concentric circles, also in the servo area S The servo signal recording pattern P _S (the center line of) these data recording tracks T _D
Are recorded with a shift of a half pitch (p / 2). That is, the head for scanning the recording track T _D is a pair of servo signal recording pattern P _S which is arranged to be shifted by a half pitch in both sides of the radial center line of the recording track T _D,
Scanning is performed simultaneously by approximately a half width, and tracking position information can be obtained in accordance with the ratio of each of these servo signals.

Further, for the servo signal recording pattern P _S of the servo area S, all tracks are fixed in a certain number in the radial direction (for example, four).
Track is divided into a plurality of groups as one group, and the tracks in the group can be identified from each other,
In addition, a circular pattern is used for all tracks in the radial direction. That is, a periodic pattern that repeats every fixed track in the radial direction, for example, every four tracks,
These 4 Any one track identifiable servo signal recording pattern of tracks P _S is recorded formed on the servo area S.

Therefore, when recording and / or reproducing an information signal on the flexible magnetic disk 1 having such a recording format by the recording / reproducing head, the tracking servo signal in the servo area S is read by the head. it allows to detect the positional deviation with respect to the data recording track T _D of the head, by slightly moving by a predetermined fine adjustment mechanism a position of the head in response to the detection output, the head of the tracking control is performed. Further, head positioning or track identification within the fixed number of tracks (for example, four tracks) is performed by the cyclic servo signal pattern in the disk radial direction.

Incidentally, the head position of and the servo area S of the data area D of each track in the figure, ID signal pattern ID _D and ID _S for identifying the data area and the servo area is recorded respectively.

Here, when accessing a desired track with respect to a disk-shaped recording medium on which a servo signal as described above has been recorded in advance, first, the recording / reproducing head is moved relatively close to the target track only by mechanical accuracy. At least two stages of control operations are performed, such as moving (coarse movement) with high accuracy, and then performing accurate positioning and tracking control on the target track. The former operation is a mechanical control operation of the head moving distance by a normal head feeding mechanism of a floppy disk, and is a so-called open loop control. It is a practical value that can be achieved without increasing the value. On the other hand, the latter high-precision positioning and tracking operation is performed by so-called closed loop control such as reading the tracking servo information as described above and finely controlling the head according to the servo information. For example, accuracy several times higher than the head positioning accuracy by only the head feed mechanism can be realized. Therefore, by combining these, it is possible to identify a track from 240 tracks to 320 tracks or more per one side of the disk.

By the way, in order to record / reproduce a floppy disk having the above-mentioned recording format, the present inventor has proposed a magnetic recording / reproducing method as disclosed in Japanese Patent Application Nos. 62-87792 and 62-107988. The device is proposed. The schematic configuration of the magnetic recording / reproducing apparatus will be described with reference to FIG.

In the example of FIG. 3, an example of the floppy disk is a so-called floppy disk having a metal hub at the center.
A 3.5-inch type magnetic disk 1 is assumed. A spindle motor 3 for rotating and driving the magnetic disk 1 is arranged on a chassis 2 of the magnetic recording / reproducing apparatus shown in FIG. 3, and a disk table 5 is mounted on a rotating shaft 4 of the spindle motor 3. The disk table 5 is configured to sandwich the periphery of the center hole of the metal hub of the disk 1 together with a disk chuck (not shown) facing the disk table 5. And
The chassis 2 holds magnetic heads 6 for recording and / or reproducing information signals on one signal recording surface and the other signal recording surface of the magnetic disk 1, respectively. A magnetic head moving device 7 for moving the magnetic head is provided. The magnetic head moving device 7 has a guide shaft 8 mounted on the chassis 2 in parallel with the chassis 2. The guide shaft 8 has a bearing hole 10 provided on one side of a head carriage 9. It is movably attached in the direction of arrow A in the drawing so that the guide shaft 8 is inserted therethrough. A needle 11 protrudes from the other side of the head carriage 9, and the needle 11 is provided on the chassis 2 with a tooth 13 of a lead screw 12 rotatably and movably mounted in parallel with the chassis 2. Is in contact with The lead screw 12 is rotatably and movably held by bearings 14, 14, one end of which is pressed and urged by a leaf spring 15 attached to the chassis 2, and the other end of which is driven by the urging force of the leaf spring 15. 16 is in contact with one end. The lever 16 is rotatably supported at an intermediate portion on a support shaft 17, and has the other end in contact with the side surface of the eccentric cam 18. The eccentric cam 18 is mounted on the chassis 2
The rotation is controlled by the fine movement motor 19 arranged above. A gear 20 is attached to one end of the lead screw 12, and the gear 20 meshes with a drive gear 22 that is driven to rotate by a feed motor 21 disposed on the chassis 2. The magnetic heads 6 are mounted on the head carriage 9 via magnetic head mounting plates 23 such that the magnetic heads 6 can freely contact and separate from the magnetic disk 1. Since the base end portions 24 of the magnetic head mounting plate 23 are leaf springs, the pair of magnetic heads 6 are brought into contact with one signal recording surface and the other signal recording surface of the magnetic disk 1, respectively. It is biased in the direction to be. One end of a cable 25 for transmitting and receiving information signals is connected to each of the magnetic heads 6, and the other end of each cable 25 is
It is connected to a control device (not shown). This control device controls the movement of the magnetic head 6 over the inner and outer circumferences of the magnetic disk 1 by controlling the rotation of the feed motor 21 and the fine movement motor 19 based on the tracking servo signal reproduced from the magnetic head 6. The rotation of the spindle motor 3 is controlled.

Needle 11, lead screw in the configuration of FIG.
The coarse movement control described above is performed by a head feed mechanism such as 12, and the fine movement control for tracking according to the servo signal is performed by the lever 16, the eccentric cam 18, and the like.

D. Problems to be Solved by the Invention By the way, in a case where a desired track is searched for while accompanied by a so-called track jump, an error of about several tracks cannot be avoided by the coarse movement control by the head feed mechanism. The head may be displaced outside the outermost track of the track or inside the innermost track. In the state where the head deviates from the recording track formation area, the servo signal cannot be obtained. Therefore, the fine movement control for returning the head to within the recording track range cannot be effectively performed. There are drawbacks such as an adverse effect due to signal loss during the occurrence, and a long time until control is stabilized.

The present invention has been made in view of such circumstances, and even when the head is out of the recording track forming range of the disk, the disk shape can prevent various adverse effects due to the inability to obtain a servo signal. The purpose is to provide a recording medium.

E. Means for Solving the Problems The disk-shaped recording medium according to the present invention, in order to solve the above-described problems, the servo area and the data area along the rotation direction of the medium that is the scanning direction of the recording track. Are alternately provided, and in the servo area, when a plurality of recording tracks arranged in the disk radial direction are divided into a plurality of groups by a certain number, each track is cyclically identified in the disk radial direction for each group. In a disk-shaped recording medium having a servo signal recording pattern formed thereon, the circularity in the disk radial direction is recorded on the outer side of the outermost track and on the inner side of the innermost track of the plurality of recording tracks. A spare track having a servo area in which a servo signal recording pattern held from the track is formed is provided. Is characterized in that disc information recording unit which disk-related information is recorded in the defect information or format, etc. Following region is formed by forming.

F. Action Even when the head deviates from the recording track formation range, it is possible to obtain a servo signal that maintains the circulability in the radial direction from the recording track. The positioning control operation can be performed effectively.

G. Embodiment FIG. 1 is a schematic plan view showing a recording format of a disc-shaped recording medium as one embodiment of the present invention, which is linearly developed in a circumferential direction.

In FIG. 1, among the plurality of recording tracks whose center lines are indicated by alternate long and short dash lines in the figure, the outermost track TR00 effective for data recording and the innermost track TR00 are used.
The 240 recording tracks up to 239 are formed, for example, in the same manner as in FIG. That is, the servo areas S in which the servo signals are recorded and the data areas D in which general data is recorded are alternately arranged along the direction of the arrow R which is the direction of rotation of the disk.
Each center line of the data recording track T _D of the data area D (one-dot chain line in the drawing), (concentrically in the disk) is arranged in the disk radial direction (arrow A) a plurality of the parallel to each other at a predetermined pitch p and which, also servo signal recording pattern P _S of the servo area S (center line) of the to these data recording track T _D, are recorded deviated by a half pitch (p / 2). Furthermore, this servo signal recording pattern P _S is the recording track of the plurality of which are arranged in the disk radial direction by a predetermined number (e.g., four each) were divided into groups, the disk radial direction of each track in each group The pattern is such that it is identified cyclically.

Further, as a feature of the present invention, as shown by a hatched portion in the drawing, the spare track TR is located on the outer side of the outermost track TR00 with respect to the plurality of effective recording tracks TR00 to TR239.
(−01), TR (−02) and TR (−03) are provided, and the spare tracks TR (239 + 1) and TR
(239 + 2) and TR (239 + 3). These spare tracks TR (-01), TR (-02), TR (-03) and TR
(239 + 1), TR ( 239 + 2), the servo area SS is provided on TR (239 + 3), in the servo area SS, the servo signal recording pattern P _S in the servo area S of the effective recording track TR00~TR239 servo signal recording pattern P _SS that cyclicity of the disk radial direction is maintained for are formed. That is, the spare tracks TR (-01) to TR (-
For the recording pattern P _SS of the servo area SS in 03) and the recording pattern P _S of the servo area S of the effective recording track, the tracks TR (−03), TR (−02), TR (−01), TR
01, TR02,... Are formed so as to maintain the above-described radial reciprocity, and the spare tracks TR (239 + 1) to TR
Regarding the recording pattern P _SS of the servo area SS in (239 + 3) and the recording pattern P _S of the servo area S of the effective recording track, the tracks TR (237), TR (238), and TR (23)
9), TR (239 + 1), TR (239 + 2), and TR (239 + 3) in this order so as to maintain the above-described radial reciprocity.

Further, the spare tracks TR (-01) to TR (-03) and TR
Between each servo area SS in (239 + 1) to TR (239 + 3), for example, a disk information recording section DD in which various information related to the disk is recorded is formed, thereby recording the original data area D. It is possible to record disc-related information without reducing the capacity. Information relating to this disc includes, for example, a defect location address of the disc,
Information such as a sector size, a recording method, and a format type is included.

According to a disk-shaped recording medium such as a floppy disk having such a recording pattern, even when the head moves out of the range of the effective recording track,
Can see the head position by reading the servo signal recording pattern P _SS of the servo area SS of the spare track, the ordinary servo operation similar speed and accuracy, the head is moved to the target track of the effective recording track be able to.

It should be noted that the present invention is not limited to only the above-described embodiment. For example, in addition to a flexible magnetic disk, the present invention may be applied to a hard magnetic disk or an optical or magneto-optical disk-shaped recording medium. May be applied. The repetition period of the servo area may be different between the effective recording track and the spare track. For example, the servo area in the spare track per one rotation (360 °) of the disk The number may be set to be an integral multiple of the number of servo areas within the range of the effective recording track. Further, the number of tracks per group when the recording tracks are divided into groups in the radial direction, the number of tracks per disk surface, and the like are not limited to the above-described embodiment. In addition, various changes can be made without departing from the spirit of the present invention.

H. Effects of the Invention According to the disc-shaped recording medium of the present invention, even when the head deviates from the recording track range, the servo signal that keeps the circulability in the radial direction from the recording track is transferred to the spare track outside the recording track range. High-precision positioning control operation including tracking control can be performed effectively at the deviated position, and the head is moved to the target track in the recording track quickly and accurately as in the normal servo operation. Can be done. Further, by forming a disk information recording section in which disk-related information such as defect information and format is recorded on the spare track, the recording capacity of the original data area is not reduced.

[Brief description of the drawings]

FIG. 1 is a plan view for explaining a schematic recording format of a disk-shaped recording medium according to an embodiment of the present invention. FIG. 2 is a schematic plan view showing a conventional recording format.
The figure is a schematic plan view showing an example of a recording / reproducing apparatus for a magnetic disk. 1 ... magnetic disk S ... servo area D ... data area P _S ... servo signal recording pattern T _D ... data recording track 5 ... disk table 6 ... magnetic head 7 ... magnetic head moving device

Claims (1)

(57) [Claims] 1. A servo area and a data area are alternately provided along a rotation direction of a medium which is an operation direction of a recording track, and a plurality of recording tracks arranged in a disk radial direction are provided in the servo area. In a disk-shaped recording medium in which a servo recording signal pattern for identifying each track cyclically in the disk radial direction is formed for each group when a certain number of groups are divided into a plurality of groups, More outer side,
And, on the inner circumference side from the innermost track, a spare track having a servo area in which a servo signal recording pattern in which the circularity in the disk radial direction is maintained from the recording track is provided. Further, a disk-shaped recording medium is provided, in which a disk information recording section in which disk-related information is recorded following the servo area is formed.