JP2007317253A - Magnetic recording and reproducing device and magnetic recording and reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic recording and reproducing device and a magnetic recording and reproducing method which enable recording and reproducing onto and from a part of a normal recording plane to be performed even if recording and reproducing cannot be performed owing to breakdown of a magnetic head accessing to some recording plane or the occurrence of obstacle in the recording plane. <P>SOLUTION: The magnetic recording and reproducing device has a plurality of recording planes 111, 112, 121, 122, 131 and 132 of a recording medium 10 and a plurality of recording and reproducing heads 101 to 106, Sector addresses utilized for specifying a write-in position and a read-out position of recording data are allotted continuously for each recording plane. Thereby, even when obstacle is caused in some recording plane or recording and reproducing head, operation as the magnetic recording and reproducing device can be continued by restricting use of the obstacle-occurring recording plane. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a magnetic recording / reproducing apparatus and a magnetic recording / reproducing apparatus including a recording medium having a plurality of recording surfaces, and a plurality of recording / reproducing magnetic heads for reading and writing data on each recording surface of the recording medium. Regarding the method.

  A conventional magnetic recording / reproducing apparatus includes a recording medium having a plurality of recording surfaces and a plurality of recording / reproducing magnetic heads for reading and writing data (see, for example, Patent Document 1). FIG. 10 is a block diagram showing a schematic configuration of the magnetic recording / reproducing apparatus 2 disclosed in Patent Document 1. The magnetic recording / reproducing apparatus 2 includes a disk disk 3 as a recording medium, a spare disk surface 4 as a recording surface, It is composed of a recording / reproducing magnetic head 5 and a spare head 6. In this type of magnetic recording / reproducing apparatus, the sector address numbers of the recording surface are assigned in order from the outer periphery of the recording surface, and are assigned in order from the outer periphery of the back surface of the recording surface after going around the outer periphery of the recording surface. When data is read and written, data can be read and written at high speed by switching a plurality of recording / reproducing magnetic heads as they are.

Japanese Patent Laid-Open No. 9-251731

  However, in a conventional magnetic recording / reproducing apparatus, when a magnetic head that accesses a certain recording surface fails or recording / reproducing cannot be performed due to a failure on the recording surface, the normal recording surface portion is also recorded / reproduced. There is a problem that the operation as a magnetic recording / reproducing apparatus cannot be continued.

  The present invention has been made in view of such circumstances, and even if a magnetic head accessing a certain recording surface fails or a recording surface fails and recording / reproduction cannot be performed, a normal recording surface can be recorded. An object of the present invention is to provide a magnetic recording / reproducing apparatus and a magnetic recording / reproducing method capable of recording / reproducing parts.

The above object is achieved by the following configurations and methods.
A magnetic recording / reproducing apparatus according to the present invention comprises a recording medium having a plurality of recording surfaces, and a plurality of recording / reproducing magnetic heads for reading and writing data to each of the plurality of recording surfaces of the recording medium. In the playback device, the sector address indicating the position of the sector, which is the minimum unit for reading and writing data, is continued for each surface of the recording medium, and when it exceeds the maximum value of one recording surface, it continues to move to the next recording surface. If the recording surface of the recording medium cannot be recorded / reproduced, the recording / reproduction is restricted for the recording surface that cannot be recorded / reproduced, and the recording / reproduction is continued using the remaining recording surface. Means.

  With this configuration, even if the recording / reproducing operation cannot be performed on a part of the recording surfaces, the defective recording surface and the recording / reproducing magnetic head are not used, and the remaining normal recording surface and the recording / reproducing magnetic head are used. Thus, the data recording / reproducing is performed, so that the operation as the magnetic recording / reproducing apparatus can be continued.

  Further, in the magnetic recording / reproducing apparatus of the present invention, the control means does not use the sector address number of the recording surface in which the failure has occurred when there is a recording surface in which the failure in recording / reproduction has occurred, and The sector address numbers are reassigned so that the sector addresses are continuous, and the recording surface where the failure has occurred is disabled.

  With this configuration, even when a failure occurs in the magnetic recording / reproducing medium, the entire apparatus is not disabled. Furthermore, although the recording capacity of the magnetic recording / reproducing apparatus is reduced on the host side that controls the magnetic recording / reproducing apparatus, it can be used continuously, and the sector address number on the recording surface of the magnetic recording medium is reassigned. Since it can be recognized as a continuous address, the recording position can be managed in the same way as in a normal state.

  In the magnetic recording / reproducing apparatus of the present invention, the control means dedicates the recording surface for reproduction when all the replacement sectors that substitute for the defective sector on the recording surface are used and the recording operation cannot be performed.

  This configuration makes it impossible to record, update, and erase data on the recording surface, but since the already recorded data can be read, the user who uses the magnetic recording / reproducing apparatus loses important information. There is no. Further, the read data can be copied and stored in another recording medium as necessary.

  In the magnetic recording / reproducing apparatus of the present invention, the control means assigns one logical unit number to each recording surface.

  With this configuration, the host side that controls the magnetic recording / reproducing apparatus can recognize a single logical unit for each recording surface, making it easy to restrict access to the recording surface on which recording / reproduction has failed and to manage failure as a unit. It can be carried out.

  In the magnetic recording / reproducing apparatus of the present invention, the control means assigns one logical unit number to each recording surface, and disables the logical unit number of the recording surface where the failure has occurred.

  With this configuration, the host side that controls the magnetic recording / reproducing apparatus can read the recorded data from the recording surface where the recording failure has occurred, so that the user using the magnetic recording / reproducing apparatus loses important information. In addition, the read data can be copied and stored in another recording medium as needed.

  In the magnetic recording / reproducing apparatus of the present invention, the control means assigns one logical unit number to each recording surface, and makes the logical unit number of the recording surface where the failure has occurred exclusively for reproduction.

  With this configuration, one logical unit number is assigned so that the sector address which is the minimum unit of recording / reproduction is continuous for each recording surface, and recording / reproduction is restricted for the recording surface where the recording / reproduction failure occurs. Can be used exclusively for reproduction, the entire recordable capacity of the magnetic recording / reproducing apparatus is reduced, but the operation as the magnetic recording / reproducing apparatus can be continued.

  The magnetic recording / reproducing method of the present invention is a magnetic recording / reproducing method in which data is read from and written to a recording medium having a plurality of recording surfaces by a recording / reproducing magnetic head, respectively. The sector address indicating the position of the sector which is the minimum unit to be written is continuously provided for each surface of the recording medium, and when the maximum value of one recording surface is exceeded, the address is continuously determined so as to move to the next recording surface. When the recording surface of the medium cannot be recorded / reproduced, the recording / reproducing is restricted for the recording surface where the recording / reproducing cannot be performed, and the recording / reproducing is continued using the remaining recording surface.

  Even if the recording / reproducing operation cannot be performed on a part of the recording surfaces by this method, the defective recording surface and the recording / reproducing magnetic head are not used, and the remaining normal recording surface and the recording / reproducing magnetic head are used. Thus, the data recording / reproducing is performed, so that the operation as the magnetic recording / reproducing apparatus can be continued.

  According to the present invention, even if the recording / reproducing operation cannot be performed on a part of the recording surfaces, the remaining recording surfaces and recording / reproducing magnetic heads are not used without using the defective recording surface and recording / reproducing magnetic head. Since data is recorded / reproduced using the, operation as a magnetic recording / reproducing apparatus can be continued.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a schematic configuration of a magnetic recording / reproducing apparatus according to Embodiment 1 of the present invention. In the figure, the magnetic recording / reproducing apparatus of the present embodiment includes a recording medium 10 for recording data, a recording / reproducing head (recording / reproducing magnetic head) 11 for recording / reproducing data, and a disk for rotating the recording medium 10. The motor 12, the motor controller 13 that controls the rotation of the disk motor 12, the head positioning motor 14 that moves the recording / reproducing head 11 to a predetermined position, the positioning controller 15 that controls the head positioning motor 14, and the data A read / write amplifier 16 for writing to and reading from the recording medium 10, a data control unit 17 for controlling data to be recorded and reproduced, a system control unit (control means) 18 for controlling the entire magnetic recording / reproducing apparatus, An interface unit 19 for exchanging data with an external device is provided.

FIG. 2 is an enlarged view of the recording medium 10 and the recording / reproducing head 11 shown in FIG. The magnetic recording / reproducing apparatus of the present embodiment includes three recording media (recording surfaces 111, 112, 121, 122, 131, 132) 10 for recording data, and recording surfaces 111 to 132 of the three recording media 10. Recording / reproducing heads 101, 102, 103, 104, 105, and 106 for reading / writing data, and the recording surfaces 111 to 132 and the recording / reproducing heads 101 to 106 form the following pairs.
Recording surface 111: recording / reproducing head 101
Recording surface 112: recording / reproducing head 102
Recording surface 121: recording / reproducing head 103
Recording surface 122: recording / reproducing head 104
Recording surface 131: recording / reproducing head 105
Recording surface 132: recording / reproducing head 106
However, the present invention can be practiced if the number of recording media 10 is one or more (two or more recording surfaces) and there are two or more recording / reproducing heads.

  Next, the operation of the magnetic recording / reproducing apparatus configured as described above will be described with reference to the flowchart shown in FIG. In the recording / reproducing operation, the recording / reproducing heads 101 to 106 which are paired with respect to the recording surfaces 111 to 132 on which recording / reproducing is performed are selected (step S301). Next, the corresponding recording / reproducing sector address is set (step S302), and then the recording / reproducing process is performed (step S303). Then, it is determined whether or not the recording / reproducing process is completed. If not completed, the selection of the recording / reproducing head, the setting of the recording / reproducing sector address, and the recording / reproducing process are repeated (step S304).

  Here, the setting of the recording / reproducing sector address will be described. FIG. 4 is a diagram showing a recording surface sector address allocation method of the magnetic recording / reproducing apparatus according to the present embodiment. FIG. 5 is a diagram showing another recording surface sector address allocation method of the magnetic recording / reproducing apparatus according to the present embodiment.

  First, sector addresses continuous from the recording surface 111 to the recording surface 132 are assigned from the outer peripheral side to the inner peripheral side for each recording surface (front / back) of each disk-shaped recording medium 10. In the example of FIG. 4, when the sector addresses are allocated to the inner circumference side, the sector addresses are assigned so as to continue from the outer circumference side of the next recording surface, and the sector addresses of all the recording surfaces 111 to 132 become continuous. Further, in the example of FIG. 5, the sector address allocation method is “outer perimeter—inner perimeter—outer perimeter—outer perimeter—inner perimeter”. The sector address allocation may be started from the inner periphery.

  As shown in the example of FIG. 4 or FIG. 5, the sector address used to specify the writing and reading position of the recording data is continuously allocated for each recording surface, and a certain recording surface or recording / reproducing head has failed. Even if there is a failure, a pair with the failure occurs (for example, when a failure occurs on the recording surface, if a failure occurs in the recording / reproducing head or recording / reproducing head paired with the recording surface) The recording surface paired therewith is not used, and data is recorded / reproduced using the remaining normal recording surface and recording / reproducing head. As a result, the operation as the magnetic recording / reproducing apparatus can be continued.

  The operation when a failure occurs on the recording surface will be described. FIG. 6 is a diagram showing a recording surface sector address allocating method when a failure occurs in the magnetic recording / reproducing apparatus according to the present embodiment. FIG. 7 is a diagram showing another recording surface sector address allocation method when a failure occurs in the magnetic recording / reproducing apparatus according to the present embodiment. In FIG. 6, when a failure occurs on the recording surface 122 shown in FIG. 4, continuous sector addresses are allocated except for the recording surface. In this case, the end address is reduced by an amount corresponding to the recording surface 122.

  As described above, according to the magnetic recording / reproducing apparatus of this embodiment, the recording / reproducing apparatus has a plurality of recording surfaces 111 to 132 and a plurality of recording / reproducing heads 101 to 106, and is used to specify the writing and reading positions of the recording data. Sector addresses are continuously assigned to each recording surface, so that even if a failure occurs on a certain recording surface or recording / reproducing head, the operation as a magnetic recording / reproducing device is restricted by restricting the use of that recording surface. It can be continued.

(Embodiment 2)
Next, a magnetic recording / reproducing apparatus according to Embodiment 2 of the present invention will be described. FIG. 8 is a diagram showing a sector address allocating method for read-only when a failure occurs in the magnetic recording / reproducing apparatus of the present embodiment. In the figure, when all the replacement sectors that substitute for the defective sectors are used on the recording surface 122, they can be used only for reading. The sector address for the recording surface 122 is valid, but recording is prohibited at the corresponding sector address, and only reproduction is possible.

  Thus, by providing a recording surface dedicated to reproduction, the recording / reproducing operation can be continued using the remaining recording surface without disabling the entire magnetic recording / reproducing apparatus. In addition, by leaving the recording surface in which the writing failure has occurred only for reproduction, the data recorded on the surface can be copied and stored in another recording medium without losing the data recorded on the surface.

(Embodiment 3)
Next, a magnetic recording / reproducing apparatus according to Embodiment 3 of the present invention will be described. FIG. 9 is a diagram showing a method of assigning sector addresses on the recording surface and assigning unit numbers in the magnetic recording / reproducing apparatus of the present embodiment. In the figure, a sector address assigned to each recording surface 111 to 132 is provided with a start address and an end address for each recording surface, and is completed on each recording surface. Furthermore, the unit number No. 1-No. Allocate 6. Here, for example, the recording surface 122 / unit no. If a failure occurs in unit 4, unit no. 4 is an unusable or playback-only unit.

  In this way, by assigning a sector address having a start and end for each recording surface, and further assigning a unit number to each recording surface, it is easy to make the recording surface where the failure occurred unusable or read-only. Yes. Access from a host such as a personal computer to the magnetic recording / reproducing apparatus managed in this way can be performed very easily without requiring special address management.

  In a magnetic recording / reproducing apparatus applied to a monitoring image recording / reproducing apparatus, it is desirable that an image is recorded without interruption in any case. However, in the conventional magnetic recording / reproducing apparatus, when a failure occurs in a recording / reproducing head or a recording medium having a data recording / reproducing function, there is no portion to be recorded and recording cannot be continued. On the other hand, by applying the magnetic recording / reproducing apparatus of the present invention, it is possible to continue the recording operation although the recording capacity is reduced even if a failure occurs in the recording / reproducing head or the recording medium. The function of the recording / reproducing apparatus can be maintained. Further, a magnetic recording / reproducing apparatus having a plurality of heads and recording surfaces can cope with a plurality of head / recording surface failures, and can provide a more reliable monitoring image recording / reproducing apparatus. It becomes.

  The present invention can continue to function as a recording device using a recording surface that does not cause a failure without disabling the entire device by making the recording surface in which the failure has occurred unusable or dedicated to reproduction. It is useful for use in a monitoring magnetic recording / reproducing apparatus comprising a recording medium having a plurality of recording surfaces and a plurality of recording / reproducing heads for reading and writing data.

1 is a block diagram showing a schematic configuration of a magnetic recording / reproducing apparatus according to Embodiment 1 of the present invention. FIG. 1 is an enlarged view of a recording medium and a recording / reproducing head of a magnetic recording / reproducing apparatus according to Embodiment 1 of the present invention. FIG. 3 is a flowchart for explaining the operation of the magnetic recording / reproducing apparatus according to the first embodiment of the present invention. The figure which shows the recording surface sector address allocation method of the magnetic recording / reproducing apparatus which concerns on Embodiment 1 of this invention The figure which shows the another recording surface sector address allocation method of the magnetic recording / reproducing apparatus which concerns on Embodiment 1 of this invention. The figure which shows the recording surface sector address allocation method at the time of the failure generation in the magnetic recording / reproducing apparatus concerning Embodiment 1 of this invention The figure which shows another recording surface sector address allocation method at the time of the failure generation in the magnetic recording / reproducing apparatus concerning Embodiment 1 of this invention The figure which shows the sector address allocation method at the time of read-only at the time of the failure generation in the magnetic recording / reproducing apparatus concerning Embodiment 2 of this invention The figure which shows the sector address allocation of the recording surface in the magnetic recording / reproducing apparatus which concerns on Embodiment 3 of this invention, and the provision method of a unit number The block diagram which shows schematic structure of the conventional magnetic recording / reproducing apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Recording medium 11 Recording / reproducing head 12 Disc motor 13 Motor control part 14 Head positioning motor 15 Positioning control part 16 Read / write amplifier 17 Data control part 18 System control part 19 External interface part 101-106 Recording / reproducing heads 111, 112, 121 122, 131, 132 Recording surface

Claims (7)

A recording medium having a plurality of recording surfaces;
In a magnetic recording / reproducing apparatus comprising a plurality of recording / reproducing magnetic heads for reading and writing data to each of a plurality of recording surfaces of the recording medium,
The sector address indicating the position of the sector, which is the minimum unit for reading and writing data, is continued for each surface of the recording medium, and when the maximum value of one recording surface is exceeded, the address is continuously transferred so as to move to the next recording surface. And, when the recording surface of the recording medium becomes impossible to record / reproduce, a magnetic unit comprising control means for restricting recording / reproducing with respect to the recording surface where the recording / reproducing cannot be performed and continuing recording / reproducing using the remaining recording surface Recording / playback device.   The control means does not use the sector address number of the recording surface where the failure has occurred when the recording surface where the failure occurs with respect to recording / reproduction, and sets the sector address number so that the sector addresses of the remaining recording surfaces are continuous. The magnetic recording / reproducing apparatus according to claim 1, wherein the recording surface on which the failure has occurred is disabled.   3. The magnetic recording / reproducing method according to claim 1, wherein when the replacement sector that replaces the defective sector on the recording surface is used and the recording operation cannot be performed, the control unit dedicates the recording surface for reproduction only. apparatus.   4. The magnetic recording / reproducing apparatus according to claim 1, wherein the control unit assigns one logical unit number to each recording surface.   4. The magnetic recording / reproducing apparatus according to claim 1, wherein the control unit assigns one logical unit number to each recording surface, and disables the logical unit number of the recording surface where the failure has occurred.   4. The magnetic recording / reproducing apparatus according to claim 1, wherein the control unit assigns one logical unit number to each recording surface, and dedicates the logical unit number of the recording surface on which the failure has occurred. In a magnetic recording / reproducing method for reading and writing data with a recording / reproducing magnetic head paired with a recording medium having a plurality of recording surfaces,
The sector address indicating the position of the sector, which is the minimum unit for reading and writing data, is continuous for each surface of the recording medium, and when the maximum value of one recording surface is exceeded, the address is continuously transferred so as to move to the next recording surface. A magnetic recording / reproducing method for restricting recording / reproduction to a recording surface where recording / reproduction cannot be performed and continuing recording / reproduction using the remaining recording surface when recording / reproduction of the recording medium becomes impossible.

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