JPH07130139A - Disk storage device and its data recording and reproducing method - Google Patents

Abstract

PURPOSE:To shorten the access time of the disk storage device by constituting the device in such a manner that the data related to each other on addresses are simultaneously recorded and reproduced to and from plural corresponding :racks via plural heads. CONSTITUTION:A disk 1 is provided with, for example, three pieces of the heads H1 to H3 by shifting the heads from each other in a diametral direction R by each of the specified number of track pitches on each of the respective surfaces thereof. The tracks T of the number obtd. by multiplying the number of the heads H1 to H3 by the number of the track pitches shifted from each other are defined as zones Z1, 7,2, etc., and the recording and reproducing of the data for :he range where these zones are equally divided are shared with the heads H1 to H3. The recording and reproducing of :he data associated with each other on the addresses to and from the plural tracks T are progressed in parallel in such l manner. As a result, the share in recording and reproducing of the data in the zones is equally allotted to each of the plural heads. The overlap and conflict between the plural heads in recording and reproducing do not arise any more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure and a data recording / reproducing method which are particularly suitable when a disk storage device such as a magnetic disk storage device handles a long series of data.

[0002]

2. Description of the Related Art Disk storage devices generally have the advantage of having a larger storage capacity than the internal memory of a host computer, but
Since there is a drawback that it takes time to access data, it is the current situation that the access time is required to be shortened. However, as is well known, this access time includes the time required to rotate the disk and the time required to move the head. Is
Since the rotation time of the former is difficult to shorten due to the principle of the disk storage device, conventionally, the movement time of the latter has been mainly shortened.

That is, by utilizing the fact that the disk storage device has at least two disk surfaces, usually four or more disk surfaces, so-called logical addresses of data accessed from the computer are in the same radial direction on a plurality of disk surfaces. The data recording positions are arranged so as to be continuous in a so-called cylinder which is a position track. As a result, considerably long data can be continuously recorded or reproduced by simply switching the head between the disk surfaces without moving the head.

Recently, it has been attempted to provide a plurality of heads on the same disk surface. For example, by arranging the heads side by side with respect to a plurality of adjacent tracks, long data can be sequentially switched not only between the disk surfaces but also within the same disk surface without moving the heads. You can record or play back continuously.

When the data to be recorded / reproduced is short, for example, for one track or less, none of the above-mentioned means has any effect.
M is built in for dispensing data, short data is recorded in this cache and then recorded in the disc when not accessed, and the data reproduced from the disc is stored in the cache during reproduction. In addition, there is known a means for omitting or reducing the head movement time associated with data access by transferring the data to the computer when the data is accessed again.

[0006]

However, the means for switching the head between the disk surfaces or within the same disk surface as described above can reduce the moving time of the head, but at the time of recording / reproducing data for each track. The required disk rotation time cannot be reduced. Also,
Although the disk rotation time can be omitted or reduced by using the above-mentioned cache, for example, in the case of long data such as an OS program for a computer, it is not effective because replay access does not occur again. There is a problem that data with a long storage capacity of the cache is consumed excessively.

In view of such problems, it is an object of the present invention to reduce the time required to move the head and rotate the disk in accessing the data, thereby shortening the access time of the disk storage device.

[0008]

According to the disk storage device of the present invention, the tracks are set in the disk surface at a constant radial pitch as usual, and a fixed number of heads are provided for each disk surface. The above-described object is achieved by arranging the track pitches of each track in the radial direction so as to be shifted from each other in such a manner that the data related to each other in the disc address can be simultaneously recorded or reproduced in parallel to the corresponding tracks via these heads. To achieve.

The association of the data in a plurality of tracks corresponding to a plurality of heads on the disk address in the above configuration is designated by a computer, for example, the data sequentially recorded in or reproduced from the plurality of tracks. It is preferable to set so as to be continuous on the logical address or so that the logical address of the sector as a recording unit of this data is continuous between a plurality of tracks.

Further, the number of track pitches for causing the plurality of heads in the above-mentioned configuration to be displaced from each other may be usually plural, but may be one in some cases. When recording or reproducing data simultaneously in parallel on a plurality of corresponding tracks by a plurality of heads, signal processing means for recording signals and reproduction signals for each head, and serial signals handled by them are parallel to each other. It is preferable to provide a conversion means for converting data and
Further, it is preferable to provide data control means for collecting the data portions handled by the latter conversion means into a continuous series of data, or conversely sorting the series of data into data parts. It should be noted that such simultaneous parallel recording and reproduction of data is not always necessary when sequential logical addresses are assigned to a plurality of tracks corresponding to a plurality of heads as described above, and access data from a computer is In some cases, some heads may be allowed to play depending on the length.

Further, in the data storage or reproduction method of the disk storage device of the present invention, the tracks are similarly set in the disk surface at a constant radial pitch, and a plurality of m heads are fixed at a constant n for each disk surface. The track pitches are each shifted in the radial direction from each other, and mn continuous tracks on the disk surface are used as zones for recording and reproducing data, and the track corresponding to the first head therein is the first track. At this time, the i-th head is made to share the recording or reproducing of the data from the n (i-1) + 1th track to the in-th track, and the m heads correspond to the corresponding m data on the disk address. The above-mentioned object is achieved by being able to record and / or reproduce from the tracks simultaneously in parallel.

The zone referred to in the above construction is not necessarily fixed to the disk surface, but may change depending on the radial position at which m heads are initially placed when recording or reproducing specific data. It is a so-called virtual zone for data recording / playback management. When recording or reproducing data by the above method according to the zone, m
Each time the recording or reproducing of data is completed for the tracks corresponding to the number of heads, if the number m head is located at the number mn track in this zone, only n (m-1) +1 tracks are recorded.
In other cases, it is preferable to move m heads for one track all at once in the radial direction of the disk as needed, and then continue recording or reproducing the next data. .

[0013]

As can be seen from the construction of the preceding paragraph, the present invention relates to a disk storage device having a plurality of heads for each disk surface, but conventionally, even if a plurality of heads are provided, the disk rotation time is not necessarily saved as described above. It is not possible to do so, and conversely, management of recording / reproducing data to / from a track is likely to be complicated, and if this management is not appropriate, a plurality of heads are sequentially moved. In many cases, such a problem occurs that the heads have to overlap and record or reproduce data, and the effect of providing a plurality of heads cannot be fully exerted.

Focusing on such a point, the disk storage device according to the present invention is provided with a plurality of heads for each disk surface, which are displaced from each other by a fixed number of track pitches in the radial direction, as described in the above paragraph. By enabling data to be recorded / reproduced on / from multiple corresponding tracks at the same time, the effective rotation time of the disk is about 1 / the number of heads while facilitating the management of data recording / reproduction. To shorten the access time of the disk storage device.

Further, in the data recording / reproducing method of the disk storage device according to the present invention, the disk storage is provided in which a plurality of m heads are provided so as to be offset from each other in the radial direction by a fixed number n of track pitches for each disk surface. As described in the configuration in the preceding paragraph, the apparatus controls recording / reproducing of data by using continuous mn tracks in the disk as a zone, or managing head movement at that time, so that each head has n tracks in the zone. Data is recorded / reproduced on / from each track, so that the recording / reproducing operation can be smoothly and efficiently carried out while utilizing all of the plurality of heads without waste and duplication.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of the configuration of a disk storage device according to the present invention and an example of the arrangement of zones on the disk surface, and FIG. 2 shows an example of the procedure for setting a track for data recording and a sector as a data recording unit in the disk. FIG. 3 shows an example of how to move the head and an operation example of software therefor.

FIG. 1 (a) shows a development view of a part of the disk 1 in the case where three heads 2 labeled with H1 to H3 are provided in the drawing, and FIG. 1 (b) shows the disk of the present invention. Storage device
A schematic configuration of 40 is shown for the case where two heads 2 are provided for each disk surface for the sake of simplification of the drawing. In the plane of the disk 1 shown in FIG. 1 (a), a large number of tracks T are usually 10 to 20 as shown by attaching numbers 1 to 18 for convenience.
It is set with a very narrow radial pitch of μm, code H1
.About.H3, the three data recording / reproducing heads 2 are mechanically coupled to each other in the illustrated example of the track pitch by offsetting them by three in the radial direction R of the disk 1 in a simplified manner in the figure. The radial positions of them are simultaneously moved and operated.

On the left side of FIG. 1 (a), there are shown two zones Z1 and Z2 used for management when recording and reproducing data corresponding to the positions of the three heads 2 shown in the figure. Is 1
9. Zone Z2 corresponds to each of the nine tracks T numbered 10-18. As described above, the zones Z1 and Z2 for management of recording / reproduction according to the present invention are the disk 1 on which a plurality of heads 2 are placed at the start of recording / reproduction of specific data.
It depends on the radial position inside.

Next, an outline of the configuration of the disk storage device 40 shown in FIG. 1B will be described. The two heads 2 shown in the upper left part of the figure are carried by a so-called slider 2a while being offset from each other in the radial direction R, and as usual, a thin metal spring plate 2b.
Is supported by a carriage 2c, which is, for example, an arm, and its radial position on the disk 1 is operated by an actuator 3 such as a voice coil motor. Drive circuit 4
The control data CD is received by the DA converter 4a, and a corresponding drive current is supplied from the drive output unit 4b to the actuator 3.

In the illustrated example, the signal processing circuit 5 for handling a data recording signal and a data reproduction signal has two heads corresponding to two heads 2.
Groups are provided, and each group includes a read / write circuit 6 connected to the head 2 via a flexible lead 2d as usual.
It includes a demodulation circuit 7 for a reproduction signal and an encoder / decoder circuit 8. Further, the reading circuit 9 for reference information, which will be described later, has two
Upon receiving a reproduction signal from one of the read / write circuits 6,
Track information Nt from reference information by collation information reading unit 9a
The servo information reading section 9b reads the servo data SD.

The control processor 10 is incorporated for the internal control of the disk storage device 40. In the present invention, the control processor 10 receives the track number Nt and the servo data SD from the above-mentioned reference information reading circuit 9 and, as is usual, First, the head 2 is moved to a desired track while referring to the former, and based on the latter, it serves to give the above-mentioned control data CD to the drive circuit 4 for the actuator 3 so that it is always placed at the center of the track. The above is the so-called mechanical portion of the disk storage device 40, and the data processor 20 shown in the lower side of the drawing is further combined therewith.

The data processor 20 is a so-called controller, and in the illustrated example, it includes the above-mentioned two sets of signal processing circuits 5 and two conversion means 21 for exchanging recording / reproducing signals and a RAM 22. Each conversion means 21 has a function of reading data from the RAM 22 and converting it into a serial recording signal and outputting it to the signal processing circuit 5, or conversely receiving a serial reproduction signal, converting it into data and storing it in the RAM 22. Fulfill By providing two sets of the converting means 21 and the signal processing circuit 5 described above, in this embodiment, data storage or reproduction for the corresponding two tracks T via the two heads 2 are simultaneously performed in parallel. You can proceed. Further, in this embodiment, two conversion means 21 and RAM
Data control means 23 for controlling the transfer of data between 22
Is incorporated into the data processor 20, the data in the RAM 22 is sorted into data parts and distributed to the respective conversion means 22, or conversely, the data parts in the two conversion means 21 are collected and given to the RAM 22 as a series of data. To be in charge.

Further, the data processor 20 is connected to a host computer (not shown) via an internal bus 31, an interface circuit 32, and an external bus 33, and is also connected to the control processor 10 described above via the internal bus 31. It is designed to work with interconnection. The data processor 20 as a so-called controller is in charge of exchanging commands with a computer as usual, and temporarily stores the data transferred from the computer in the RAM 22 and then records the data on the disk 1.
Or conversely, the data is reproduced from the disk 1 and the RAM 22
The data recording / reproducing operation for transferring the data from the computer to the computer is performed. Particularly, in the context of the present invention, the target track on which the head 2 should be placed is referred to the current value of the track number Nt by the reference information reading circuit 9 during the recording / reproducing operation. After the calculation, the control processor 10 is sequentially designated.

In the disk storage device 40 of the present invention configured as shown in FIG. 1 (b) described above, a plurality of data are recorded on each side of the disk 1 shown in FIG. 1 (a), generally for recording and reproducing data. Is provided with m heads 2, and when m is 3 or more, the positions of these heads 2 are displaced from each other in the radial direction R by a constant pitch, generally n track pitches. Note that n
Is usually plural, but may be 1 in some cases.
In the example shown in FIG. 1 (a), m = 3 and n = 3. further,
In the present invention, mn pieces in each surface of the disk 1, and in the illustrated example, nine continuous tracks T are set as zones Z1, Z2, etc. to manage recording and reproduction of data in units of zones, and each head 2 The recording and reproduction of data for a predetermined range in the zone is shared.

In the example of FIG. 1 (a), the heads H1 are 1-3, the heads H2 are 4-6, and the heads H3 are 7-9.
Recording and reproduction of data in each track T is shared. In the figure, such a sharing range is shown by three zone parts z1 to z3 in each zone Z1 and Z2. In general, when the track corresponding to the first head H1 in the zone is the first track, the i (th) head Hi is moved from n (i-1) + 1th track to in.
The data recording is shared for the zone part zi which is the range up to the second track. As described above, according to the present invention, recording and reproduction of data are reasonably managed in units of zones for a plurality of heads and zones of each head. It is possible to smoothly and efficiently perform the data recording / reproducing operation while using all the data without any fear.

Further, in the present invention, by providing the signal processing circuit 5 and the conversion means 21 for each head as described above, for example, generally m heads correspond to the data related to each other on the address in the disk. It is possible to record or reproduce from m tracks simultaneously and in parallel. FIG. 2 is a diagram showing an example of address allocation of data to be recorded in a plurality of tracks corresponding to a plurality of heads when recording and reproducing data by such simultaneous parallel processing (a).
And (b). As is well known, since the recording unit of data in the disk 1 is a sector, these sectors are indicated by S1, S2, S3, S4, etc. in these figures, and the head 2 is set to H1 in order to simplify the figure. It is assumed that there are two track pitches denoted by H2 and H2 and they are displaced from each other in the radial direction of the disk 1 by two track pitches.

As shown in the drawing, the reference information RI is recorded on the disc 1 in the circumferential direction as usual, and the sectors S1 to S4 and the like are set between them. Reference information
The RI usually includes the collation information such as the above-mentioned track number Tn and the servo data SD for accurately detecting the current radial position of the head 2, and the disc 1 is actually recorded by the reference information RI. Tracks are set, and so-called formatting is performed thereafter to set sectors S1 to S4, etc., as is well known.

In the example shown in FIG. 2 (a), two tracks with the numbers 1 and 3 corresponding to the heads H1 and H2 are consecutively arranged on an address, more precisely, on a logical address designated by the computer. Tracks T1 and T2 to
Set S1, S2, etc. sequentially. Also, a track having an address that follows the two tracks marked with the numbers 2 and 4 that correspond when the heads H1 and H2 are shifted by one track pitch.
T3 and T4, and the arrangement of the sectors in them is the same as above. With this, the zone Z1 ends, and similarly for the next zone Z2, the tracks with the numbers 5, 7, 6, 8 are similarly set as the next consecutive tracks T5, T6, T7, T8 on the address.

In the example shown in FIG. 2B, the two tracks marked with the numbers 1 and 3 corresponding to the heads H1 and H2 are the same track T1 on the address, and the two tracks T1 are included in the two tracks T1. Sectors S1 to S4, etc. are assigned to both of them alternately as shown in the figure. The remaining two tracks with the numbers 2 and 4 in the zone Z1 are set as the next track T2 on the address, and sectors are set in these tracks in the same alternate allocation arrangement as above. Similarly, for the next zone Z2, two tracks each having the numbers 5,7 and 6,8 are designated as the next consecutive tracks T3 and T4 on the address respectively.

As can be easily understood, in any of the setting examples shown in FIGS. 2 (a) and 2 (b), data is simultaneously recorded in or reproduced from a plurality of corresponding tracks via a plurality of heads. it can. At this time, of course, the data control means 23 in the data processor 20 shown in FIG. 1 (b) operates according to each mode of such setting, but in order to facilitate the operation, the setting of FIG. 2 (b) is performed. The method is slightly more advantageous. As described above, according to the present invention, since the recording / reproducing of the data for the corresponding plurality of tracks can be progressed in parallel by using the plurality of heads, the effective rotation time of the disk 1 is reduced to about 1 / the number of the heads 2. Access time can be shortened.

Next, with reference to FIG. 3, a procedure for moving the head 2 in recording and reproducing data will be described. Figure 3 (a)
In the case where the two heads 2 are designated by the symbols H1 and H2 and both are displaced by 3 track pitches, that is, when m = 2 and n = 3, these are set in the zone Z1 and in the zone Z1.
The arrow shows how to move from Z1 to Z2. At the start of recording / reproducing of data, the two heads 2 are placed so that the first head H1 corresponds to the first track numbered 1 of zone Z1 as shown in the figure. After the recording / reproduction is completed in this state, the heads H1 and H2 are moved by one track pitch as shown by the arrows and placed on the tracks of the numbers 2 and 5. Next, move the heads H1 and H2 by one track pitch so that they are placed on the tracks of the numbers 3 and 6.

In this state, the head H2 has reached the last track of the numeral 6 in the zone Z1.
And H2 must be moved from the current zone Z1 to the next zone Z2 all at once. This movement between zones is carried out by moving the head H1 from the track of numeral 3 to the track of numeral 7 which is the head of the zone Z1 by 4 track pitches as shown in the figure. Move to a truck. The procedure for moving the heads H1 and H2 after the zone switching is of course the same as above.

As can be seen from the above, the movement of the head in the present invention is generally performed by m heads after the recording / reproducing of the data for the corresponding track in a zone is completed, and the m-th head is the last track of the zone. If it is on the mnth track, it is necessary to move m heads all at once by n (m-1) +1 track pitches, and otherwise by 1 track pitch at a time. Become.

A specific operation example for moving the head in the manner shown in FIG. The flow in the figure is, for example, the operation steps of the software loaded in the data processor 20 of FIG. 1 (b). In addition, this Fig. 3 (b)
In the flowchart, the track number is the variable j, and the initial value is the number of movements of the head in a zone per track pitch.
The variable k is expressed as follows. Also, FIG.
It is assumed that the reference information reading circuit 9 shown in (b) reads the track number Nt corresponding to the first head among the m heads. The flow shown in the drawing is started at the same time when the recording / reproducing of data based on the command from the computer is started.

In the first step S1, the track number js at which the first head should be placed is first calculated from the logical address specified by the computer of the data to be recorded / reproduced, and the value of this js is entered in the track number variable j. , And the corresponding variable k of the number of movements is initialized to ks. Of course, the initial value ks of the variable k may usually be 1 described above. In the following step S2, the track number j is output to the control processor 10 so that the head head H1 is placed on the specified track. Since the recording / reproducing of the data is started thereafter, the completion of the recording / reproducing operation is waited in step S3, and at the same time when the completion report is received from the above-mentioned data control means 23, the process proceeds to step S4. In this step S4, the track number Nt is read from the reference information reading circuit 9 as the current value of the variable j for confirmation, and in the next step S5, it is judged whether or not the recording / reproducing of the data designated by the computer is completed. .

Since the recording / reproduction is not completed in the beginning,
If the determination in step S5 is negative, the flow moves to step S6.
In this step S6, it is determined whether or not the recording / reproducing of the data with respect to the zone in which the head is placed is unfinished or completed, in the illustrated example, whether or not the number of head movements k is smaller than n,
As long as this is the case, the values of j and k are incremented in step S7, the flow is returned to step S2, and the same operation is repeated while moving the head by one track pitch. When the recording / reproducing of the data for a certain zone is completed and the value of the variable k reaches n, the flow moves from step S6 to step S8, and this time, add A = n (m-1) +1 to the value of the variable j. Specifies the movement of the head to the next zone, sets the value of the variable k to the initial value 1, and then returns the flow to step S2 to start the recording / reproducing operation for the next zone. When the recording / reproducing of the data designated by the computer is completed by sequentially advancing such an operation, the flow exits the operation loop from step S5, and the flow shown in FIG.
The step operation shown in the flowchart of FIG.

The present invention is not limited to the embodiments described above, and the present invention can be implemented in various modes. The configuration of the disk storage device of FIG. 1 (a) is merely an example, the track and sector setting method of FIG. 2 is also a basic example, and the flow chart of FIG. 3 (b) is also an example and various modifications may be made. It is possible. For example, if a so-called skew system is adopted in which the track groups corresponding to a plurality of heads are set as units and are sequentially shifted in the circumferential direction of the disk, the time required to move the heads can be further shortened.

[0038]

As described above, according to the present invention, a plurality of heads are provided for each disk surface so as to be offset from each other by a fixed number of track pitches in the radial direction, and a continuous track group in the disk is recorded and reproduced. As each zone, each head is made to share the recording / reproducing of data with respect to the zone portion consisting of the number of tracks corresponding to the displacement between the heads in this zone, and the data related to each other on the address is dealt with through the plural heads. The following effects can be achieved by enabling simultaneous recording and reproduction for a plurality of tracks to be recorded.

(A) Since the recording / reproducing shares of the data in the zone are evenly assigned to each of the plurality of heads, duplication or competition between the plurality of heads in the recording / reproducing operation cannot occur. The data recording / reproducing operation can be smoothly and efficiently proceeded while effectively utilizing everything. (b) Since data can be simultaneously recorded / reproduced on / from plural tracks corresponding to plural heads, the effective rotation time of the disk at the time of recording / reproducing data can be reduced to about 1 / the number of heads. In addition to the effect of eliminating wasteful head movement time due to competition between a plurality of heads, the access time of the disk storage device can be greatly shortened.

As described above, the present invention eliminates the confusion that tends to occur when a plurality of heads are provided by rational management of the data recording / reproducing operation, improves the operation efficiency, and shortens the access time to improve the disk storage device. It can contribute to performance improvement.

[Brief description of drawings]

FIG. 1 shows a configuration example of a disk storage device of the present invention and an example of zone arrangement in the disk, FIG. 1A is a development view of a disk surface illustrating the zone arrangement, and FIG. 1B is a disk storage device. 3 is a configuration circuit diagram of FIG.

[Fig. 2] Fig. 2 shows an example of how to set tracks and sectors inside the disc, and Fig. 2 (a) and Fig. 2 (b) show an enlarged development view of the main part of the disc surface showing different setting points for tracks and sectors. Is.

3A and 3B show a procedure for moving a head and a specific operation example thereof. FIG. 3A is a development view of a disk surface showing a movement of the head, and FIG. 3B is an operation of software for moving the head. 6 is a flowchart of steps.

[Explanation of symbols]

1 disk 2 heads or plural heads 5 signal processing circuit for recording / reproducing signals 9 reference information reading circuit 10 control processor for controlling movement of head 20 data processor for controlling recording / reproducing operation of data 21 recording / reproducing signal and data Conversion means 22 RAM for temporarily storing recording / reproducing data 23 data control means 40 disk storage device H1 each head among plural heads H2 each head among plural heads H3 each head among plural heads j variable indicating the track number m head Number n Number of track pitch to shift the head Nt Track number R Disk radial direction Reference information including collation information such as track number T Track Z1 zone for recording / reproducing management of data Z2 zone for recording / reproducing management of data

Claims (5)

[Claims] 1. A large number of tracks are set in a disk at a constant radial pitch, and a plurality of heads for recording / reproducing data are offset from each other in the radial direction by a fixed number of track pitches for each disk surface. A disk storage device, which is provided so that data associated with each other in an address in the disk can be simultaneously recorded in or reproduced from a corresponding track via these plural heads in parallel. 2. A large number of tracks are set in a disk at a constant radial pitch, and a plurality of m heads are recorded in the disk radial direction at a constant n track pitch for each disk surface for recording data. The mn continuous tracks on each disk surface are set as zones for data recording, and the track corresponding to the first head is set as one track.
N (i-1) +1 for the i-th head when the track is the
The data recording for the range from the 1st track to the inth track is shared, and the data related to each other in the disc address can be simultaneously recorded on the corresponding m tracks by m heads. A data recording method for a disk storage device characterized by the above. 3. The method according to claim 2, wherein n (m-1) +1 when the m-th head is located at the mn-th track in the zone each time data recording is completed for m tracks. Disk storage characterized in that data recording is continued after moving m heads in the radial direction of the disk at the same time for only one track, and for one track otherwise. Device data recording method. 4. A large number of tracks are set in a disk at a constant radial pitch, and a plurality of m heads for each surface of the disk for reproducing data are fixed n track pitches in the radial direction of the disk. The tracks corresponding to the first head in each of the mn continuous tracks in each disk surface are set as the zones for data reproduction.
N (i-1) +1 for the i-th head when the track is the
The data reproduction for the range from the 1st track to the inth track is shared, and the m heads can reproduce the data related to each other in the disc address simultaneously from the corresponding m tracks in parallel. A data reproducing method for a disk storage device characterized by the above. 5. The method according to claim 4, wherein when the m-th head is located at the mn-th track in the zone each time data reproduction from the m tracks is completed, n (m-1) +1. Disk storage characterized in that data reproduction is continued after moving m heads in the radial direction of the disk all at once for one track, and for one track otherwise. Device data reproduction method.