JPH02227885A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To record data for write and read in a free recording format by writing, reading and erasing the data for each of plural areas sectioned on a data surface, and recording the original sector servo data of the area to at least one area. CONSTITUTION:Plural areas, namely, an outer circumferential side data zone 15 and an inner circumferential side data zone 17 are provided dividingly in a concentric condition on a data surface 13, plural sector servo data areas 19 are provided in a radial condition in the whole area in a diameter direction on the outer circumferential side data zone 15, and a data recording area 21 is provided in the other part. On the inner circumferential side data zone 17, the sector servo data area is not provided, and only a data recording area 23 is provided. Thus, to the data recording area 23, the data for write and read can be recorded in the free recording format.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a magnetic disk device.

(Prior Art) A magnetic disk device, for example, a magnetic disk device as shown in FIG. 4 is used in a magnetic disk device that performs positioning control using sector servo.

On the data zone 3 of the data surface 1 of this magnetic disk, a plurality of sector servo data areas 5 are provided radially throughout the entire radial direction, and data recording areas 7 are provided on the other parts of the data zone 3. . The sector servo data area 5 is an area for recording sector servo data. The sector servo data is data for accurately positioning the magnetic head on the data zone 3. The data recording area 7 is an area for recording write/read data.

A magnetic disk device having such a magnetic disk is
Predetermined servo data is read by the servo head, and the data head is moved onto a predetermined track on the data zone 3 based on this servo data. Then, the sector servo data recorded in the sector servo data area 5 is read by the servo head, and based on this sector servo data, the data head is moved a small amount onto a strictly accurate predetermined track on the data zone 3. Position.

(Problem to be Solved by the Invention) However, since the data for writing and reading cannot be written in the sector servo data area 5, the area in which the data for writing and reading can be written is other than the sector servo data area 5. The area is limited to the data recording area 7. Therefore, the recording format of the write/read data must be restricted, and there is a problem in that the write/read data cannot be recorded in a free recording format.

Further, the sector servo data area 5 is provided radially throughout the data zone 3 in the radial direction. Therefore, when rewriting the sector servo data by changing the sector length of the write/read data, it is necessary to demagnetize the entire data zone 3 and rewrite the sector servo data. As a result, the defect information recorded on the data zone 3 at the time of manufacturing the drive parameters is also lost, resulting in the problem that this defect information must be rewritten.

The present invention has been made to solve the above-mentioned difficulties, and its purpose is to be able to record write/read data in a free recording format, and to change drive parameters when rewriting sector servo data. An object of the present invention is to provide a magnetic disk device in which defect information etc. at the time of manufacture are not lost.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above object, the present invention positions a magnetic head by performing sector servo based on sector servo data recorded on the data surface of a magnetic disk. The data surface is divided into a plurality of concentric areas in which data can be written and read, and at least one of these areas has sector servo data unique to that area. It is characterized by recording.

(Function) - In the present invention, data is written, read, and erased for each of a plurality of areas divided on the data surface.

Ru.

(Embodiment) Hereinafter, a magnetic disk device according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a plurality of magnetic discs 11 are provided on a rotating shaft 10 of, for example, a stepping motor (not shown). . One of the plurality of magnetic disks 11 has a servo surface 12 on one surface for recording servo data for head positioning, and a data surface 13 on the other surface for recording data for writing and reading. It is. The other magnetic disks 11 have data surfaces 13 on both sides.

As shown in FIG. 2, the data surface 13 is provided with a plurality of concentric areas, for example, an outer data zone 15 and an inner data zone 17.

A plurality of sector servo data areas 19 are provided radially over the entire area in the radial direction on the outer data zone 15, and data recording areas 21 are provided in other parts of the outer data zone 15. The sector servo data recording area 19 is
This is an area where sector servo data is recorded. The sector servo data is data for accurately positioning the data head (described later) on the outer data zone 15, and reference data for accurately positioning the data head on the inner data zone 17. There is also. The data recording area 21 is an area for recording write/read data. Note that, in the data recording area 21, data for writing and reading is recorded under the limitations of the recording format, as in the conventional case.

On the inner circumferential side data zone 17, only the data recording area 23 is provided without providing a sector servo data area as described above. The data recording area 23 is similar to the data recording area.
This is an area for recording write/read data. Note that writing/reading data can be recorded in the data recording area 23 in a free recording format.

On the other hand, at the leading end of the carriage 34, a servo head 35 is provided opposite the servo surface 12, and a data head 37 is provided opposite the data surface 13.

A reference servo circuit 39 is connected to the servo head 35 .

The reference servo circuit 39 sends a control signal for positioning the data head 37 to the head positioning amplifier 41 based on the servo data read by the servo head 35 . The head positioning amplifier 41 applies a control voltage to, for example, a voice fill motor (not shown) integrated in the carriage 34 according to an input signal, and moves the carriage 34
is rotated by a predetermined amount to move the servo rad 35 and the data rad 37 onto a predetermined track.

Further, a suitable one of the data heads 37 is selected by a head switching device 43 and connected to an amplifier 45.

The amplifier 45 processes the write/read data and sends sector servo data to the sector servo circuit 47. Based on the sector servo data sent from the amplifier 45, the sector servo circuit 47 sends a control signal to the head positioning amplifier 41 for accurately positioning the data head 35 on the target track, and further controls the data head 35. The deviation value for the servo head 37 from a predetermined reference position is stored in a RAM (memory that can be written and read at any time) 49.
send to The RAM 49 stores the above deviation value.

Next, the data head 37 is moved to a predetermined outer data zone 1.
The operation of this magnetic disk device when positioning on the target track No. 5 will now be described.

First, the servo head 35 reads the servo data recorded on the servo surface 12 and sends it to the reference servo circuit 39 . A control signal for positioning the data head is sent from the reference servo circuit 39 to the head positioning amplifier 41, the carriage 34 is rotated by a predetermined amount, and the data head 37 is placed on a predetermined track on the outer data zone 15. is moved.

On the other hand, a suitable one of the data heads 35 is selected by the head switching device 43 and connected to the amplifier 45, and the data is recorded in the sector servo data area 19 on the outer data zone 15 by this data head 35. Sector servo data is read and amplifier 4
5 to the sector servo circuit 47. From the sector servo circuit 47 to the head positioning amplifier 4
1, a control signal for accurately positioning the data head 37 on the target track is sent.

Then, the carriage 34 is slightly rotated, and the data head 37 is accurately positioned on the target track on the outer data zone 15.

Thereafter, the data recording area 21 is
Writing/reading data is read/written to the target track, and the writing/reading data is processed via the amplifier 45.

At this time, the three sector servo circuits calculate the deviation value of the data head 37 from a predetermined reference position with respect to the servo head 35 (for example, caused by the influence of thermal off-track, etc.), and this deviation value is stored in the RAM 411.
K: It is possible to remember oneself.

Next, the operation of this magnetic disk device when positioning the data head 37 on the target track of the inner data zone 17 will be described.

First, by the same operation as above, the inner data zone 1
The data head 37 is positioned on the track in the outer data zone 15 closest to the data zone 7. At this time, the sector servo circuit 47 further calculates a deviation value of the data head 37 from a predetermined reference position with respect to the servo head 35, and this deviation value is stored in the RAM 41.

Thereafter, the data head 37 is moved onto a predetermined track on the outer data zone 17 based on the servo data on the servo surface 12. Then, based on the deviation value stored in the RAM 41, the sector servo circuit 47 sends a control signal to the head positioning amplifier 41, and the carriage 3
4 by a small amount of rotation according to the above deviation value, and the data head 37
is accurately positioned on the target track on the outer data zone 17.

Thus, according to this embodiment, data for writing and reading can be recorded in the data recording area 23 in a free recording format.

Next, other embodiments will be described.

In the above embodiment, the inner data zone 17 is not provided with a sector servo data area and only the data recording area 23 is provided.
A plurality of sector servo data areas 51 are provided radially over the entire radial area, and data recording areas 53 for recording defect information and the like during drive parameter manufacturing are provided in other parts. Note that it goes without saying that normal writing/reading data can be recorded in this data recording area 53.

In this case, the sector servo data in either the outer data zone 15 or the inner data zone 17 can be updated independently without affecting the recording state in the other data zone.

For example, even if the sector servo data is rewritten in the outer data zone 15 by changing the sector length of the data to be recorded, there is no need to demagnetize and rewrite the inner data zone 17, and as a result, the data will not be recorded. The defect information and the like at the time of drive parameter manufacturing recorded in the area 53 remain recorded, and there is no need to write these data again.

Note that, like the data recording area 21, data for writing and reading is read and written in the data recording area 53 under the limitations of the recording format.

Further, in the above embodiment, the data surface 13 is divided into two areas, the outer data zone 15 and the inner data zone 17, but it may be divided into a larger number of areas, for example, three areas. For example, if two of these three areas are provided with a sector servo data area and a data recording area, and the other one is provided with a data recording area, you can write and read in any recording format. Therefore, it is possible to provide a magnetic disk device that can record data for use in a drive and that does not lose defect information and the like at the time of manufacturing drive parameters when rewriting sector servo data.

The present invention is not limited to the above-mentioned embodiments, but is applicable to sector servo technology in a type of hard disk that increases storage capacity by dividing the media into zones and changing the number of sectors per ten racks on the inner and outer peripheries. It can also be implemented when realizing.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to record write/read data in a free recording format, and when rewriting sector servo data, defect information etc. at the time of drive parameter manufacturing can be saved. Therefore, it is possible to provide a magnetic disk device in which no data is lost.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of essential parts of a magnetic disk device according to an embodiment of the present invention, FIG. 2 is a diagram showing the data surface 13 of the magnetic disk 11 shown in FIG. 1, and FIG. 3 is a diagram showing other parts. FIG. 4 is a diagram showing the data surface 13 of the conventional disk device. 11... Magnetic disc, 12... Servo surface, 13...
...Data surface, 15...Outer data zone, 17.
... Inner data zone, 19... Sector servo data area, 21... Data recording area, 23... Data recording area, 34... Carriage, 35... Servo head, 37... Data head, 39... Reference servo circuit, 41... Head positioning amplifier, 43...
・Head switching device, 45...Amplifier, 47...Sector servo circuit, 49...RAM, 51...Sector servo data area, 53...Data recording area Applicant: Toshiba Corporation

Claims (1)

[Claims] (1) In a magnetic disk device capable of positioning a magnetic head by performing sector servo based on sector servo data recorded on a data surface of a magnetic disk, the data surface can be used to write and read data. Divide into multiple concentric areas, and at least one of these areas
A magnetic disk device characterized in that one area records sector servo data unique to that area.