Magnetic disk device and control method thereof

A disk device and control circuit technology, applied in the direction of memory address/allocation/relocation, instrumentation, generation of response errors, etc.

Active Publication Date: 2020-03-10
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, when there is no free area in the replacement area, the host cannot write new data to the disk device.

Method used

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  • Magnetic disk device and control method thereof
  • Magnetic disk device and control method thereof
  • Magnetic disk device and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0021] figure 1 It is a diagram showing an example of the hardware configuration of the magnetic disk drive according to the first embodiment. exist figure 1 2 shows the configuration inside the casing 100 when the upper cover of the magnetic disk device 1 is removed. like figure 1 As shown, the magnetic disk device 1 includes a magnetic disk 101, a magnetic head 102 for reading and writing data, and the like.

[0022] The magnetic disk 101 is a disk medium capable of reading and writing data. The magnetic disk 101 is provided with one of the two magnetic disks (the first magnetic disk 101), and the other (the second magnetic disk 101 (refer to Figure 7 )) is disposed on the back side of the first magnetic disk 101 ( figure 1 the depth side of the paper). In addition, in the present embodiment, the number of magnetic disks is described as two, but the number of magnetic disks may be only one, or may be three or more.

[0023] The first magnetic disk 101 and the second ...

no. 2 Embodiment approach

[0112] In the first embodiment, when there is no empty area in the replacement area 122 ( Figure 10 No in S301), the control circuit 20 maintains the operation mode as the normal mode and executes adding an area to the replacement area 122 .

[0113] In the second embodiment, an example will be described in which the operation mode is temporarily changed from the normal mode to the write-inhibit mode before adding an area to the spare area 122 .

[0114] In addition, in the second embodiment, only the processing different from that in the first embodiment will be described. Description of the same processing as in the first embodiment is omitted.

[0115] Figure 11 It is a flowchart showing an example of the procedure related to the update of the allocation of each area (media cache area 120 , user area 121 , and replacement area 122 ) in the second embodiment.

[0116] The control circuit 20 (for example, the MPU 25 ) determines whether there is an empty area, that is, a...

no. 3 Embodiment approach

[0129] In the second embodiment, the size of the area to be added to the replacement area 122 is set in advance.

[0130] In the third embodiment, an example in which the size of the area to be added to the replacement area 122 can be set by the host computer 2 will be described.

[0131] In addition, in the third embodiment, only the processes different from those in the first and second embodiments will be described. Description of the same processing as in the first and second embodiments is omitted.

[0132] Figure 12 It is a flowchart showing an example of the procedure related to the updating of the allocation of each area (the medium cache area 120 , the user area 121 , and the replacement area 122 ) in the third embodiment.

[0133] In S501 and S502, perform the Figure 11 The same processing as in S401 and S402.

[0134] In the third embodiment, the extension command can include designation of a size. The size may also be specified by a ratio relative to the siz...

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PUM

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Abstract

One embodiment relates to a magnetic disk device and a control method thereof. According to one embodiment, a magnetic disk device includes a disk medium which has a first region, a second region, anda redundant third region, and a control circuitry. The first region is a region to which first data received from a host is written. The second region is a region to which the first data is temporarily written before the first data is written to the first region. The control circuitry executes defect detection to the first region. Upon detecting a defect, the control circuitry substitutes a firstlocation having the defect in the first region with a second location in the third region. Depending on a total size of free regions of the third region, the control circuitry reallocates a fourth region from the second region to the third region.

Description

[0001] related application [0002] This application enjoys the priority of Japanese Patent Application No. 2018-165068 filed on September 4, 2018, and the entire content of this Japanese Patent Application is cited in this application. technical field [0003] This embodiment generally relates to a magnetic disk device and a control method thereof. Background technique [0004] Conventionally, in a magnetic disk device, a sector where data cannot be read normally occurs in the user area during operation. The magnetic disk device detects such a sector as a defective sector. Furthermore, when the data writing destination is a defective sector, the magnetic disk device writes the data in a preset replacement area instead of the user area. The magnetic disk device prohibits acceptance of new data when there is no free area in the replacement area. That is, when there is no free area in the replacement area, the host cannot newly write data to the magnetic disk device. Cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F12/02G06F12/0802G06F11/10
CPCG06F12/023G06F12/0802G06F11/1044G11B17/028G11B25/043G11B19/048
Inventor 堀口丰
Owner KK TOSHIBA
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