JPH05182117A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To shorten the processing time required for reading and writing data from and to a medium. CONSTITUTION:The integrated data 16 from a host device 7 are divided into the number of heads 11 to 14 stored in a ROM 5 by a data transforming circuit 6. Each of heads is moved to the top of media 81 and 82 by a head control circuit 4 and a head driving circuit 3 and writes the data. Moreover, divided data 151 to 154 are read by each head from the media 81 to 82, integrated with the integrated data 16 and transmitted to the host device 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and more particularly to reading and writing control of data on a magnetic disk.

[0002]

2. Description of the Related Art Conventionally, in a magnetic disk device, when performing arbitrary data reading and writing on a magnetic disk, a magnetic head (hereinafter, simply referred to as a head) is sequentially operated in track units of the magnetic disk. Was going by.

[0003]

In the above-mentioned conventional method, when reading or writing arbitrary data from any head, an operation of reading or writing any data of the head next to any head is performed. Since the heads are sequentially operated for each track for this purpose, a control time (hereinafter referred to as a head switching time) for switching from an arbitrary head to the next head is always necessary. That is, when reading or writing arbitrary data as shown in FIG. 4, for example, as shown in FIG.
Since the head switching time 45 is included between 1, 42, 43 and 44, there is a drawback that it takes extra time for head switching to read or write data.

An object of the present invention is to provide a magnetic disk device which does not require extra time for head switching when reading and writing data from a magnetic disk.

[0005]

A first magnetic disk device according to the present invention comprises a plurality of magnetic heads mounted on the same cylinder and adapted to read and write data on a medium.
Head moving means for moving the magnetic head and head sector address information indicating the head sector address on the medium from a host device are used to judge whether or not the magnetic head needs to be moved, and when the movement is necessary, the head moving means Is driven to move the magnetic head to the position on the medium indicated by the head sector address information, and when the movement of the magnetic head is completed, head drive means for transmitting the head movement end information and the host device on the medium. When receiving transfer direction information indicating a transfer direction of reading or writing of arbitrary data and receiving head movement end information from the head driving means, head control information is transmitted to the magnetic head to transfer the transfer direction. Data is read and written in the transfer direction indicated by the information, and the head control information is transferred to the magnetic field. Head control means for transmitting head operation information indicating that the magnetic head has been transmitted, storage means for storing the number of magnetic heads as head number information, and transfer direction information from the host device. If the information indicates the writing of data, after the head operation information is received from the head control means, any total data received from the host device is the number indicated by the head number information stored in the storage means. And dividing the divided data into data by the head control means to cause the magnetic head to write the data, and if the transfer direction information instructs the reading of the data, the divided data is read from the medium from the magnetic head. Data conversion means for receiving the data, integrating the divided data corresponding to the number indicated by the head number information, and transmitting the integrated data to the host device; A.

A second magnetic disk device of the present invention is mounted on the same cylinder, a plurality of magnetic heads for reading and writing data on the medium, a head moving means for moving the magnetic heads, and a medium from a host device. The head sector address information indicating the top sector address is received to determine whether or not the magnetic head needs to be moved, and when the movement is necessary, the head moving means is driven to indicate the magnetic head by the head sector address information. When the magnetic head is moved to a position on the medium and the movement of the magnetic head is completed, head drive means for transmitting head movement end information and transfer indicating the transfer direction of reading or writing arbitrary data on the medium When receiving the direction information and receiving the head movement end information from the head driving means, the transfer direction information is sent to the magnetic head. The head control means for sending head control information for instructing the reading and writing of data, which is the transfer direction, and the head operation information for indicating that the head control information has been sent, and the number of the magnetic heads are the number of heads. Storage means stored as information, and head designation information for receiving the head number information from the storage means to recognize the number of the magnetic heads, receiving head sector address information from a host device, and designating a corresponding magnetic head. A head recognizing circuit for outputting and magnetic heads are provided corresponding to each magnetic head, receive transfer direction information from a host device, and if the transfer direction information instructs reading of data, the corresponding magnetic head reads from the medium. When the data is transmitted to the host device and the transfer direction information indicates the writing of the data, the data received from the host device is received. Buffer for transmitting the data to the corresponding magnetic head, and the head sector address information and the transfer direction information from the higher-level device, and when the transfer direction information instructs the reading of the data from the medium, It is determined whether or not the data to be read this time is stored in the buffer, and if it is stored, the storage buffer designation information for designating the buffer is transmitted, and when the data is not stored, and When the transfer direction information indicates writing to the medium, the storage buffer designation information that designates the buffer to be stored this time is updated and transmitted, and
Stored information recognizing means for transmitting the head sector address information to the head drive means and transmitting the transfer direction information to the head control means, and head designating information from the head recognizing means, and storing to the stored information recognizing means. When receiving the buffer designation information and the head operation information from the head determination circuit, the individual buffer control information is transmitted to the buffer designated by the storage buffer designation information and the data received from the host device is stored in the buffer. And the transfer direction information from the host device,
The head designation information is received from the head recognition unit and the head control information is received from the head control unit, and the individual head control information is transmitted to the magnetic head designated by the head designation information to indicate the transfer direction information. And a head selecting means for executing reading and writing of the stored data.

[0007]

In the first magnetic disk device, when reading and writing data, each head is divided and simultaneously written, and the divided data read simultaneously is integrated so that there is no need to switch the head for each track. Since each head operates simultaneously, the time is greatly reduced.

In the second magnetic disk device, since it is possible to cause each head to read data at the same time and store the next data in the buffer in advance, the data from the medium is newly read when the host device requests it. Does not need to be read, and processing time is shortened.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment of a magnetic disk device according to the present invention.

This magnetic disk device has heads 1 ₁ , 1
₂ , 1 ₃ , 1 ₄ , an arm 2, a head drive circuit 3, a head control circuit 4, a ROM 5, and a data conversion circuit 6.

Head 1₁ , 1₂ , 1₃ , 1_Four Are the same
Head mounted on the₁ And 1₂ Is the magnetic
Disk medium (hereinafter simply referred to as medium) 8₁ And again 1
₃ And 1_Four Is medium 8₂ Divided data into 15₁ , 15₂ , 15
₃ , 15_Four Read and write. Arm 2
Is head 1₁ , 1₂ , 1₃ , 1_Four Move individually.
The head drive circuit 3 includes the host device 7 to the medium 8₁ , 8₂ upper
Start sector address information indicating the start sector address
Head 1 after receiving 9₁ , 1₂ , 1₃ , 1_Four Need to move
And move the arm 2 to move the head when movement is necessary.
1₁ , 1₂ , 1 ₃ , 1_Four The start sector address information 9
The target medium 8₁ , 8₂ Moved to the upper position
Let's head 1₁ , 1₂ , 1₃ , 1_Four Is complete
The head movement end information 10 is transmitted to the head control circuit 4.
It The head control circuit 4 is the medium 8₁ , 8 ₂ Any day on
Data whether it is a read or a write
The transfer direction information 11 indicating the transfer direction is received from the host device 7.
And receives the head movement end information 10 from the head drive circuit 3.
Head 1₁ , 1₂ , 1₃ , 1_Four Head control information
Data transfer method in which information 12 is transmitted and transfer direction information 11 indicates
Depending on the direction, if you read or write
By the transmission of the head control information 12, the head 1 ₁ ，
1₂ , 1₃ , 1_Four Motion that means that
The work information 13 is transmitted to the data conversion circuit 6. ROM5 is
Head 1₁ , 1₂ , 1₃ , 1_Four Number of heads, that is, 4
It is stored as the number information 14. Data conversion circuit 6
Receives the transfer direction information 11 from the higher-level device 7, and
If it is instructed to write data, the head control circuit 4
From the host device 7 after receiving the head operation information 13 from
The number of heads from the ROM 5 for the received arbitrary integrated data 16
Head 1 recognized by information 14 ₁ , 1₂ , 1₃ , 1_Four 
Divide into 4 data corresponding to the number 4 of
Data 15₁ , 15₂ , 15₃ , 15_Four To
Dead 1₁ , 1₂ , 1₃ , 1 _Four Send to head control circuit
Medium 8 by the instructions of 4₁ , 8₂ To write to. Well
Further, the transfer direction information 11 indicates the reading of data.
If so, the data conversion circuit 6 is transferred from the head control circuit 4 to the head.
After receiving the motion information 13, the head 1₁ , 1₂, 1₃ ，
1_Four Is medium 8₁ , 8₂ Arbitrary divided data read from
15₁ , 15₂, 15₃ , 15_Four Waiting to receive
Divided data 15₁ , 15₂ , 15₃ , 15_Four Receive
The head number information 14 from the ROM 5
Do 1₁ , 1 ₂ , 1₃ , 1_Four 4 minutes corresponding to 4
Split data 15₁ , 15₂ , 15₃ , 15_Four By integrating
Send any integrated data 16 that has been integrated to the higher-level device 7.
It

In the magnetic disk drive of this embodiment, the medium 8
_When reading or writing arbitrary data on ₁ and 8 ₂ , the data can be divided into four heads and the heads can be operated simultaneously. Therefore, as shown in FIG. In the case of four heads, read or write operation time 41, 42, 4
In addition to the sum of 3,44, four times of the head switching time 45 took an extra time, whereas one time of the read or write operation time 31, 32, 33, 34 and one time of the head movement time 35. Therefore, the processing time is greatly reduced.

FIG. 2 is a block diagram of a second embodiment of the magnetic disk device of the present invention.

This magnetic disk device replaces the data conversion circuit 6 of FIG. 1 with a head recognition circuit 17 and a buffer 18.
₁ , 18 ₂ , 18 ₃ , 18 ₄ , a stored information recognition circuit 19, a buffer selection circuit 20 and a head selection circuit 21 are provided.

Head 1₁ , 1₂ , 1₃ , 1_Four And arm 2
The head drive circuit 3 and the ROM 5 are the same as those in FIG.
Perform processing. The head control circuit 4 is the medium 8₁ , 8₂ Upper de
Whether the data is read or write
The transfer direction information 25 indicating the transfer direction is stored information described later.
The head movement end information 10 is received from the recognition circuit 18 and
When received from the drive circuit 3, the transfer direction information 25 indicates
To read or write the stored data.
Output the head control information 12 to the head selection circuit 21 described later.
In addition, the head control information 12 is transmitted and the head 1 is transmitted.₁ ，
1₂ , 1₃ , 1 _Four Motion that means that
The work information 13 is sent to the buffer selection circuit 20 described later.
It The head recognition circuit 17 uses the ROM 5 to obtain head number information 1
Head 1 by 4₁ , 1₂ , 1₃ , 1_Four Recognize the number 4
However, the head sector address information 9 is received from the host device 7.
The head specification information 23 that specifies the applicable head.
It is sent to the far selection circuit 20 and the head selection circuit 21. Ba
Tiffa 18₁ , 18₂ , 18₃, 18_Four Are each
Do 1₁ , 1₂ , 1₃ , 1_Four It is provided corresponding to
Transfer direction information 11 is received from the higher-level device 7 and transfer direction information is received.
If 11 indicates reading of data, the head 1
₁ , 1₂ , 1₃ , 1_Four Data 22 read by
If you send it to the device 7 and instruct to write the data,
Data 22 received from the positioning device 7 to the head 1₁ , 1₂ ，
1₃ , 1_Four Send to. The stored information recognition circuit 19 is a higher-level device.
Position 7 to start sector address information 9 and transfer direction information 1
1 and the transfer direction information 11 is the data medium 8₁ , 8₂ 
If read from the
When all buffers 18₁ , 18₂ , 18₃ , 18_Four This time
Whether the arbitrary data 22 to be read is stored or not
If it is stored, the corresponding buffer is
The storage buffer designation information 26 to be designated is used as a buffer selection circuit.
Send to 20 if not stored or write
Sometimes a storage buffer that specifies the buffer to store this time
The designated information 26 is updated and transmitted to the buffer selection circuit 20.
On the other hand, the head sector address information 24
The transfer direction information 25 is transmitted to the head control circuit 4.
Send. The buffer selection circuit 20 is the head recognition circuit 17
The head designation information 23 and the stored information recognition circuit 19
Receiving the storage buffer designation information 26 from the head control circuit
When the head operation information 13 is received from 4, the storage buffer instruction
Buffer 18 specified by constant information 26₁ , 18₂ , 1
8₃, 18_Four Individual buffer control information 28₁ , 28₂ ，
28₃ , 28_Four Of the data sent from the higher-level device 7
The data 22 is stored. The head selection circuit 21 is a host device
7 from the transfer direction information 11 again, the head recognition circuit 17
Receives the head designation information 23 from the head control circuit 4.
When the head control information 12 is received,
Designated head 1₁ , 1₂ , 1₃ , 1_Four Against
Separate head control information 27₁ , 27₂ , 27₃ , 27_Four Send
The transfer direction information 11 and the head control information 12
According to medium 8₁ , 8₂ Read data to
Or let them write.

In the magnetic disk device of this embodiment, arbitrary data can be read simultaneously by the heads 1 ₁ , 1 ₂ , 1 ₃ and 1 ₄ , and the next data is previously stored in the buffer 18.
When the data is read to ₁ , 18 ₂ , 18 ₃ and 18 ₄ and a read request for the next data is issued from the higher-level device, it is not necessary to read the requested data again from the medium, so the processing time is shortened.

[0018]

As described above, in the first magnetic disk device of the present invention, data is divided for each head, each head is operated simultaneously, and the read divided data is integrated to integrate each head. There is no switching for each track,
Since the number of times of head movement is smaller than the number of times of head switching and each head operates simultaneously, there is an effect that the processing time for both reading and writing is significantly shortened.

Further, in the second magnetic disk device, it is possible to cause each head to read the data at the same time and store the next data in the buffer in advance. Since there is no need to read from, the processing time is shortened.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of a magnetic disk device of the present invention.

FIG. 2 is a diagram showing a processing time of the magnetic disk device of FIG.

FIG. 3 is a block diagram of a second embodiment of the magnetic disk device of the present invention.

FIG. 4 is a diagram showing a processing time of a conventional example of a magnetic disk device.

[Explanation of symbols]

1 ₁ , 1 ₂ , 1 ₃ , 1 ₄ head 2 arm 3 head drive circuit 4 head control circuit 5 ROM 6 data conversion circuit 7 host device 8 ₁ , 8 ₂ medium 9, 24 start sector address information 10 head movement end information 11 , 25 transfer direction information 12 head control information 13 head operation information 14 head number information 15 ₁ , 15 ₂ , 15 ₃ , 15 ₄ divided data 16 integrated data 17 head recognition circuit 18 ₁ , 18 ₂ , 18 ₃ , 18 ₄ buffer 19 Storage information recognition circuit 20 Buffer selection circuit 21 Head selection circuit 22 Data 23 Head designation information 26 Storage buffer designation information 27 ₁ , 27 ₂ , 27 ₃ , 27 ₄ Individual head control information 28 ₁ , 28 ₂ , 28 ₃ , 28 ₄ Individual Buffer control information 31, 32, 33, 34 1 track read or write operation time 35 heads Travel time

Claims (2)

[Claims] 1. A plurality of magnetic heads mounted on the same cylinder for reading and writing data on a medium, a head moving means for moving the magnetic heads, and a head sector indicating a head sector address on the medium from a host device. The address information is received to determine whether or not the magnetic head needs to be moved, and when the movement is necessary, the head moving means is driven to move the magnetic head to a position on the medium indicated by the head sector address information. When the movement of the magnetic head is completed, the head drive means for transmitting the head movement end information and the transfer direction information indicating the transfer direction indicating whether reading or writing arbitrary data on the medium are received from the host device, and When the head movement end information is received from the head driving means, head control information is transmitted to the magnetic head to transfer the transfer direction information. A head control means for executing reading and writing of data, which is the transfer direction indicated by the information, and transmitting head operation information indicating that the head control information has been transmitted to the magnetic head; and the number of magnetic heads is the number of heads. Storage means stored as information and transfer direction information from the host device, and if the transfer direction information indicates writing of data, after receiving head operation information from the head control means, the host device The integrated data received from the storage unit is divided into a number of pieces of data indicated by the head number information stored in the storage unit, and the divided data is written to the magnetic head by the head control unit, and the transfer is performed. If the direction information indicates reading of data, the divided data read from the medium is received from the magnetic head. Magnetic disk device having a data converting unit that jointly transmits divided data corresponding to the number indicated by the serial number of heads information integrated data to the host device. 2. A plurality of magnetic heads mounted on the same cylinder for reading and writing data on a medium, head moving means for moving the magnetic heads, and a head sector indicating a head sector address on the medium from a host device. The address information is received to determine whether or not the magnetic head needs to be moved, and when the movement is necessary, the head moving means is driven to move the magnetic head to a position on the medium indicated by the head sector address information. When the movement of the magnetic head is completed, the head drive means for transmitting the head movement end information and the transfer direction information indicating the transfer direction of reading or writing of arbitrary data on the medium are received, and the head driving means is provided. When the head movement end information is received from the magnetic head, the magnetic head reads the data in the transfer direction indicated by the transfer direction information. Head control means for transmitting head control information for instructing writing and writing, and for transmitting head operation information indicating that the head control information has been transmitted, and a memory storing the number of magnetic heads as head number information. A head recognizing circuit for receiving the head number information from the storage means, recognizing the number of the magnetic heads, and receiving head sector address information from a higher-level device, and outputting head specifying information for specifying a corresponding magnetic head; It is provided corresponding to each magnetic head, receives transfer direction information from the host device, and if the transfer direction information instructs to read data, the corresponding magnetic head sends the data read from the medium to the host device. , If the transfer direction information indicates the writing of data, the data received from the host device is transmitted to the corresponding magnetic head. Buffer and the head sector address information and the transfer direction information from the higher-level device, and when the transfer direction information instructs the reading of data from the medium, it tries to read this time to all the buffers in the previous process. It judges whether or not the data is stored, and if it is stored, the storage buffer designating information designating the buffer is transmitted, and when the data is not stored and the transfer direction information is written to the medium. Is instructed, the storage buffer designating information for designating the buffer to be stored this time is updated and transmitted, the head sector address information is transmitted to the head driving means, and the transfer direction information is transmitted to the head. The stored information recognition means for transmitting to the control means, the head designation information from the head recognition means, and the stored information recognition When the storage buffer designation information is received from the means and the head operation information is received from the head determination circuit, the individual buffer control information is transmitted to the buffer designated by the storage buffer designation information and is transmitted to the buffer from the host device. Buffer selection means for storing data, transfer direction information from the host device, head designation information from the head recognition means, and head control information from the head control means, and a magnetic head designated by the head designation information is received. A magnetic disk device having head selecting means for transmitting individual head control information to read and write data designated by the transfer direction information.