CN113439306A - Magnetic memory device - Google Patents
Magnetic memory device Download PDFInfo
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- CN113439306A CN113439306A CN202180001800.3A CN202180001800A CN113439306A CN 113439306 A CN113439306 A CN 113439306A CN 202180001800 A CN202180001800 A CN 202180001800A CN 113439306 A CN113439306 A CN 113439306A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
- G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
- G11B25/043—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/09—Digital recording
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0683—Plurality of storage devices
- G06F3/0689—Disk arrays, e.g. RAID, JBOD
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
- G11B21/08—Track changing or selecting during transducing operation
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2508—Magnetic discs
- G11B2220/2516—Hard disks
Abstract
A magnetic storage device according to an embodiment includes: a magnetic disk storing data; a magnetic head for reading and writing data from and to the magnetic disk, the magnetic head being moved on the magnetic disk by an actuator; a confirmation processing unit that executes, at a predetermined timing, a confirmation processing of confirming normality of data of a predetermined size among data stored in the magnetic disk; and a setting unit that sets a preset 1 st addition value for the upper address of the upper address and the lower address constituting the head address for starting the next confirmation process when the confirmation process is completed.
Description
Technical Field
Embodiments of the present invention relate to magnetic storage devices.
Background
Conventionally, as a means for storing data, a magnetic storage device (HDD (Hard Disk Drive)) or the like is widely used. The magnetic storage device includes a magnetic disk for storing data, and a magnetic head for reading and writing data from and to the magnetic disk and moving over the magnetic disk by an actuator.
With regard to the magnetic storage device, it is reported that a failure has occurred due to long-time fixed-point levitation. The fixed-point suspension refers to the following phenomenon: when only specific data of the disk is accessed, the head hardly moves on the disk (including a case where the head does not move at all, the same applies hereinafter). If the fixed-point levitation continues for a long time, the lubricant on the disk may become uneven or the magnetic head may be attracted to the disk, thereby causing a failure.
Prior art documents:
patent documents:
[ patent document 1] Japanese patent application laid-open No. 7-281966
Disclosure of Invention
Problems to be solved by the invention
However, in the conventional art, the long-time fixed-point levitation cannot be easily avoided in the magnetic storage device.
Accordingly, an object of an embodiment of the present invention is to provide a magnetic storage device capable of easily avoiding fixed-point levitation for a long time.
Means for solving the problems
A magnetic storage device according to an embodiment includes: a magnetic disk storing data; a magnetic head for reading and writing data from and to the magnetic disk, the magnetic head being moved on the magnetic disk by an actuator; a confirmation processing unit that executes, at a predetermined timing, a confirmation processing of confirming normality of data of a predetermined size among data stored in the magnetic disk; and a setting unit that sets a preset 1 st addition value for the upper address of the upper address and the lower address constituting the head address for starting the next confirmation process when the confirmation process is completed.
Drawings
Fig. 1 is a schematic diagram showing an overall configuration of a computer according to an embodiment.
Fig. 2 is a table showing information for calculating a head address of patrol (control) processing in the embodiment.
Fig. 3 is a flowchart showing inspection processing and the like in the computer according to the embodiment.
Fig. 4 is a flowchart showing a head address determination process of the next round inspection process in the computer according to the embodiment.
Fig. 5 is a diagram showing a relationship between an address of the HDD and a target area of the patrol processing in the embodiment.
Detailed Description
Hereinafter, embodiments of the magnetic storage device according to the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments.
Fig. 1 is a schematic diagram showing an overall configuration of a computer 1 according to an embodiment. The computer 1 (magnetic storage device) includes a main board 10, a RAID card 3, and a plurality of HDDs (Hard Disk drives) 2. The computer 1 also includes a display device such as a display, not shown, and an input device such as a keyboard and a mouse.
The main board 10 is a control board on which a CPU (Central Processing Unit) 11, a ROM (Read Only Memory), a RAM (Random Access Memory), and the like are mounted, which are not shown.
The HDD2 is widely used in recent years because it can store a large amount of data although its operating speed is low in auxiliary storage devices for computers. The HDD2 is composed of many components, and includes, for example, a magnetic disk for storing data and a magnetic head for reading and writing data from and to the magnetic disk and moving the magnetic head over the magnetic disk by an actuator.
Further, for example, the HDD2 in recent years has a hardware interface such as Serial Attached SCSI (SAS) or Serial ATA (SATA), and the logical interface for connection is SCSI or ATA. In these logical interfaces, the storage location of data is managed in units of sectors, addresses, and the like.
The HDD2 is a device capable of storing large volumes of data at low cost, and on the other hand, it is also a device that stores data using magnetism or an actuator (such as a motor), and therefore storage of data cannot be sufficiently ensured due to physical factors. As a technique for coping with this, RAID (Redundant Arrays of Inexpensive Disks) exists.
In RAID, a plurality of HDDs 2 are used to save data with redundancy. In this way, even when a failure of the HDD2 occurs, the data stored in the failed HDD2 can be restored based on the redundant data after the failed HDD2 is replaced. The RAID card 3 (hardware RAID board) implements this RAID function by hardware.
The RAID card 3 is an expansion card installed in the computer 1. The RAID card 3 implements not only the RAID function but also a function of patrol processing that periodically accesses the HDD2 and confirms normality of data of the HDD 2.
Further, HDD2 has a problem of failure due to long-term fixed-point levitation as described above. Then, the following techniques are explained: by setting the range of the polling processing so as to regularly and forcibly move the magnetic head by using the function of the polling processing of the RAID card 3, long-time fixed-point levitation can be easily avoided by executing the polling processing.
The RAID card 3 is provided with a RAID controller 31. The RAID controller 31 is a hardware configuration including a control device such as a processor and a storage device such as a flash memory, for example. The function of the RAID controller 31 may be implemented by a hardware configuration as described above, may be implemented by a software program, or may be implemented by firmware.
The RAID controller 31 includes a processing unit 32, a setting unit 33, and a transmitting/receiving unit 34.
The processing unit 32 executes various processes related to RAID. The processing unit 32 also functions as a polling processing unit (confirmation processing unit) that executes polling processing (confirmation processing) for confirming normality of data of a predetermined size among data stored in the HDD2 at a predetermined timing.
The processing unit 32 determines the timing of the polling processing for each data of a predetermined size so that the polling processing can be executed for a predetermined period (for example, several weeks) for all the data of the plurality of HDDs 2.
When the 1-time polling process is completed, the setting unit 33 adds a 1 st addition value, which is set in advance such that the head is moved by a predetermined amount or more in the radial direction on the disk for each polling process, to the head address (an example of the target address) of the polling process, and sets the head address of the next polling process.
For example, when the range of the polling processing is set by the logical address of the HDD2, the 1 st addition value may be set to a value that can reliably avoid long-time fixed-point levitation by moving the magnetic head more than a predetermined amount in the radial direction on the magnetic disk per polling processing, in consideration of the correspondence between the logical address and the physical address of the HDD2, the physical configuration of the HDD2, and the like.
When the patrol processing is completed, the setting unit 33 adds the 1 st added value to the head address of the patrol processing, and when the added address exceeds the address range of the disk, the 1 st predetermined-bit upper address among the addresses is set to 0, and the 2 nd added value is added to the 2 nd predetermined-bit lower address, thereby setting the head address of the next patrol processing. In this case, for example, the 2 nd added value is a predetermined size.
For example, when the size from the head address to the final address of the address range is smaller than a predetermined size when the head address of the next round inspection process is set, the setting unit 33 sets the range of the next round inspection process from the head address to the final address. The details of the processing of the setting unit 33 will be described later.
The transmission/reception unit 34 performs data transmission/reception with the motherboard 10 and the HDD 2.
Fig. 2 is a table showing information for calculating the head address of the patrol processing in the embodiment. The setting unit 33 stores and manages the following information (1) to (6) in the nonvolatile storage unit in order to execute the inspection process.
(1) HDD Capacity (Capacity)
The unit is, for example, a sector, which is information of the total storage capacity of the single HDD2 as the auxiliary storage device. The final address of the address range is referred to as "final lba (last lba)". For example, in the case where the Capacity is "0 x 80000000" and the address range is "0 x 00000000" to "0 x7 FFFFFFF", the final LBA is "0 x7 fffffffff".
(2) Head address (LBA) of next round inspection process
The head address information of the next patrol processing determined after the patrol processing is completed is, for example, a sector. The LBA is obtained by adding the following (3) LBA-L and (4) LBA-H. In the following description, the LBA is mainly 32 bits in a 2-system format and 8 bits in a 16-system format (hereinafter also referred to as "0 x"). LBA-L is the lower 12 bits (2 nd predetermined number of bits) of the 32 bits in the 2 nd system and the lower 3 bits (2 nd predetermined number of bits) of the 8 bits in the 16 th system in the LBA. The LBA-H is 20 bits (1 st predetermined digit) of the 32 bits in the 2 nd scale and 5 bits (1 st predetermined digit) of the 8 bits in the 16 th scale in the LBA.
(3) Low order address (LBA-L)
The unit is, for example, a sector (details will be left to be described later), which is the lower address information of the 2 nd prescribed bit number used for calculating the LBA of (2).
(4) High order address (LBA-H)
The unit is, for example, a sector (details will be left to be described later) and is the 1 st predetermined number of bits of address information used for calculating the LBA of (2).
(5) High/low management split Shift (Shift)
Is bit shift value information of 2 bins (in the above example, "12") indicating a boundary for dividing the LBA into two parts of LBA-H and LBA-L. In addition, hereinafter, a value obtained by shifting "1" to the high bit by Shift in the 2-ary system is a "1 st added value". That is, if Shift is "12", the 1 st added value is "1000000000000" under 2-ary and "1000 (0x 1000)" under 16-ary.
(6) Inspection Range (Size)
The size information of the data read out in the patrol processing is, for example, a sector.
For example, when Shift is "12", the lower 12-bit amount of the LBA in the 2-system is LBA-L, and the remaining upper 20-bit amount is LBA-H. Specifically, for example, if the LBA is "0 x 12345678", then LBA-L becomes "0 x 678", and LBA-H becomes "0 x 12345000".
When Shift is "16", the lower 16-bit amount of LBA in the 2-system is LBA-L, and the remaining upper 16-bit amount is LBA-H. Specifically, for example, if the LBA is "0 x 12345678", then LBA-L becomes "0 x 5678", and LBA-H becomes "0 x 12340000".
For example, when the function of the RAID controller 31 is implemented by firmware, the processing unit 32 executes the patrol processing at a predetermined timing after the firmware transitions to the normal state.
When executing the polling processing, the processing unit 32 executes the polling processing for data of size (6) (for example, "0 x 100") from the (2) LBA out of the address range of the HDD 2.
The setting unit 33 sets the head address of the polling processing to change from the left side to the right side of the "LBA" in fig. 2. The processing in this case will be described with reference to fig. 3 and 4.
Fig. 3 is a flowchart showing inspection processing and the like in the computer 1 according to the embodiment.
First, in step S1, the processing unit 32 determines whether or not the start timing of the inspection process has come, and if so, it proceeds to step S2, and if not, it returns to step S1.
In step S2, the processing unit 32 executes the polling process on data having a predetermined Size (Size) from the LBA of the head address among the data stored in the HDD 2.
Next, in step S3, the processing unit 32 determines whether or not the result of the inspection process in step S2 is normal, and if so, it proceeds to step S4, and if not, it proceeds to step S5.
In step S5, the processing unit 32 stores, as data, the result of the inspection process of step S2 as abnormal (error). Further, the user of the computer 1 may be notified of an error by voice or display.
In step S4, the setting unit 33 executes the head address determination process of the next round inspection process. Step S4 is explained with reference to fig. 4. Fig. 4 is a flowchart showing the head address determination process (the process of step S4 in fig. 3) of the next round inspection process in the computer according to the embodiment.
In step S41, the setting unit 33 adds the 1 st added value (for example, "0 x 1000") to the LBA-H to calculate a new LBA-H.
Next, in step S42, the setting unit 33 calculates a new LBA by adding LBA-H to LBA-L.
Next, in step S43, the setting unit 33 determines whether or not the LBA exceeds the final LBA, and if so, the process proceeds to step S44, and if not, the process proceeds to step S47.
In step S44, the setting unit 33 sets LBA-H to 0 ("0 x 00000000").
Next, in step S45, the setting unit 33 adds the 2 nd addition value (for example, "0 x 100") to the LBA-L to calculate a new LBA-L.
Next, in step S46, the setting unit 33 calculates a new LBA by adding LBA-H to LBA-L, and the process proceeds to step S47.
In step S47, the setting unit 33 determines whether or not the address (LBA + Size-1) from the LBA to the Size exceeds the final LBA, and if yes, the process proceeds to step S49, and if no, the process proceeds to step S48.
In step S48, the setting unit 33 sets the polling processing range from LBA to (LBA + Size-1).
In step S49, the setting unit 33 sets the polling processing range from the LBA to the final LBA.
Here, a specific example of the calculation will be described with reference to fig. 2. Also, fig. 5 is referred to. Fig. 5 is a diagram showing a relationship between the address of the HDD2 and the target area of the patrol processing in the embodiment. In the following, it is assumed that all the results of the polling processing are normal.
The values of column C1 of fig. 2 are initial values. When the patrol processing of Size (for example, "0 x 100") is executed with the LBA "0 x 00000000" of the column C1 as the head address and the head address of the next patrol processing is determined, first, the 1 st addition value "0 x 1000" is added to the LBA-H "0 x 00000000" of the column C1 to calculate a new LBA-H "0 x 00001000" (step S41 in fig. 4).
Next, this LBA-H "0 x 00001000" is added to LBA-L "0 x 000" of column C1, thereby calculating a new LBA "0 x 00001000" (step S42).
At this time, the LBA "0 x 00001000" does not exceed the final LBA "0 x7 FFFFFFF" (step S43: NO).
In addition, the address (LBA + Size-1, i.e., "0 x000010 FF") by the amount of the LBA "0 x 00001000" forward Size "0 x 100" does not exceed the final LBA "0 x7 FFFFFFFFF" (step S47: NO).
Therefore, the patrol processing range is set from LBA "0 x 00001000" to (LBA + Size-1, i.e., "0 x0000 FFF") (step S48). In this manner, the values of column C2 are set. Further, with respect to LBA-L and Size (Size), the value of column C1 is copied to column C2.
In this manner, the head address of the patrol processing is updated every time the patrol processing ends, and the values in fig. 2 are in the state of column C3. When the patrol processing of Size (Size) "0 x 100" is executed with the LBA "0 x7FFFE 000" of the column C3 as the head address and the head address of the next patrol processing is determined, first, the 1 st addition value "0 x 1000" is added to the LBA-H "0 x7FFFE 000" of the column C3 to calculate a new LBA-H "0 x7FFFF 000" (step S41).
Next, this LBA-H "0 x7FFFF 000" is added to LBA-L "0 x 000" of rank C3, thereby calculating a new LBA "0 x7FFFF 000" (step S42).
At this time, the LBA "0 x7FFFF 000" does not exceed the final LBA "0 x7 FFFFFFF" (step S43: NO).
Further, the address (LBA + Size-1, i.e., "0 x7FFFF0 FF") of the LBA "0 x7FFFF 000" forward Size "0 x 100" does not exceed the final LBA "0 x7 FFFFFFFFF" (step S47: NO).
Therefore, the patrol processing range is set from LBA "0 x7FFFF 000" to (LBA + Size-1, i.e., "0 x7FFFF0 FF") (step S48). In this manner, the values of column C4 are set. Further, with respect to LBA-L and Size (Size), the value of column C3 is copied to column C4.
Next, when the patrol processing by the Size of "0 x 100" is executed with the LBA "0 x7FFFF 000" of the column C4 as the head address and then the head address of the next patrol processing is determined, first, the 1 st addition value "0 x 1000" is added to the LBA-H "0 x7FFFF 000" of the column C4 to calculate a new LBA-H "0 x 80000000" (step S41).
Next, this LBA-H "0 x 80000000" is added to LBA-L "0 x 000" of column C4, thereby calculating a new LBA "0 x 80000000" (step S42).
At this time, this LBA "0 x 80000000" exceeds the final LBA "0 x7 FFFFFFF" (step S43: YES).
Therefore, LBA-H is set to 0 ("0 x 00000000") (step S44).
Then, the 2 nd addition value "0 x 100" is added to the LBA-L "0 x 000" of the column C4, thereby calculating a new LBA-L "0 x 100" (step S45).
Next, LBA-H "0 x 00000000" is added to LBA-L "0 x 100", thereby calculating a new LBA "0 x 00000100" (step S46).
In addition, the address (LBA + Size-1, i.e., "0 x000001 FF") of the Size "0 x 100" onward from this LBA "0 x 00000100" does not exceed the final LBA "0 x7 FFFFFFFFF" (step S47: NO).
Therefore, the patrol processing range is set from LBA "0 x 00000100" to (LBA + Size-1, i.e., "0 x000001 FF") (step S48). In this manner, the values of column C5 are set. Further, regarding Size (Size), the value of column C4 is copied to column C5.
In this manner, the range of the patrol processing in the HDD2 is shifted in the longitudinal direction indicated by the arrow in fig. 5. Therefore, the magnetic head is forcibly operated at each polling process, and long-time fixed-point suspension can be avoided.
Further, in the related art, the range of the inspection process is shifted in the lateral direction of fig. 5. Therefore, even if the polling processing is performed, the magnetic head hardly moves, and long-time fixed-point levitation cannot be avoided by the polling processing.
As described above, according to the computer 1 of the embodiment, when the patrol processing is completed, the 1 st addition value, which is set in advance such that the magnetic head is moved by a predetermined amount or more in the radial direction on the magnetic disk every time the patrol processing is performed, is added to the head address of the patrol processing, and the head address of the next patrol processing is set, so that the long-time fixed-point levitation can be easily avoided. That is, by setting the head address of the polling processing as described above by using the polling processing function originally provided in the RAID card 3, the head can be easily forcibly moved at short time intervals.
In addition, as a more specific setting procedure of the head address of the patrol processing, when the address to which the 1 st added value is added to the head address of the patrol processing exceeds the address range of the disk, the 1 st predetermined-bit upper address among the addresses is set to 0, and the 2 nd added value is added to the 2 nd predetermined-bit lower address. The 2 nd added value is set to a predetermined size. As can be seen from fig. 5, the patrol processing can be executed without omission for the entire data of the address range of HDD 2.
When the head address of the next round inspection process is set, if the size from the head address to the final address of the address range is smaller than a predetermined size, the range of the next round inspection process is set from the head address to the final address. Thus, the scope of the patrol processing can be appropriately set even in the vicinity of the final address.
The program executed by the computer 1 according to the present embodiment is provided by being loaded in advance into a ROM or the like. The program may be provided by recording a file in an installable or executable format on a computer-readable recording medium such as a CD-ROM, a Flexible Disk (FD), or a CD-R, DVD (Digital Versatile Disk).
Further, the program may be stored in a computer connected to a network such as the internet and may be provided by downloading the program through the network. The program may be provided or distributed via a network such as the internet.
The program is configured as a module including the above-described respective units (the processing unit 32, the setting unit 33, and the transmission/reception unit 34), and the CPU (processor) reads the program from the ROM as actual hardware and executes the program, whereby the respective units are loaded into the main storage device and generated.
While the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in other various forms, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.
For example, in the above-described embodiment, the case where Shift is "12" has been mainly described. However, not limited to this, for example, in consideration of the recent trend toward larger capacities of HDDs, Shift may be set to "16" or "20" or the like, and another value may be adopted as Shift within a range satisfying the condition that fixed-point levitation can be avoided for a long time.
Description of the reference numerals
1 … … computer, 2 … … HDD, 3 … … RAID card, 10 … … mainboard, 11 … … CPU, 31 … … RAID controller, 32 … … processing part, 33 … … setting part and 34 … … transceiver part.
Claims (4)
1. A magnetic storage device is provided with:
a magnetic disk storing data;
a magnetic head for reading and writing data from and to the magnetic disk, the magnetic head being moved on the magnetic disk by an actuator;
a confirmation processing unit that executes, at a predetermined timing, a confirmation processing of confirming normality of data of a predetermined size among data stored in the magnetic disk; and
and a setting unit that sets a preset 1 st addition value for the upper address of the upper address and the lower address constituting the head address for starting the next confirmation process when the confirmation process is completed.
2. The magnetic storage device of claim 1,
the setting unit sets the upper address to 0 and adds a 2 nd addition value to the lower address when the head address exceeds the address range of the disk, thereby setting the head address of the next confirmation process.
3. The magnetic storage device of claim 2,
the 2 nd addition value is the prescribed size.
4. The magnetic storage device of claim 3,
when the size from the head address to the final address of the address range of the disk is smaller than the predetermined size when the head address of the next confirmation process is set, the setting unit sets the range of the next confirmation process from the head address to the final address.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-006289 | 2020-01-17 | ||
| JP2020006289A JP6946485B2 (en) | 2020-01-17 | 2020-01-17 | Magnetic storage device |
| PCT/JP2021/001174 WO2021145406A1 (en) | 2020-01-17 | 2021-01-15 | Magnetic storage device |
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| Publication Number | Publication Date |
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| CN113439306A true CN113439306A (en) | 2021-09-24 |
| CN113439306B CN113439306B (en) | 2023-06-06 |
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| CN202180001800.3A Active CN113439306B (en) | 2020-01-17 | 2021-01-15 | Magnetic memory device |
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| JP (1) | JP6946485B2 (en) |
| KR (1) | KR20220024746A (en) |
| CN (1) | CN113439306B (en) |
| SG (1) | SG11202112189XA (en) |
| TW (1) | TWI755064B (en) |
| WO (1) | WO2021145406A1 (en) |
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| WO2021145406A1 (en) | 2021-07-22 |
| JP2021114349A (en) | 2021-08-05 |
| TW202129507A (en) | 2021-08-01 |
| KR20220024746A (en) | 2022-03-03 |
| CN113439306B (en) | 2023-06-06 |
| JP6946485B2 (en) | 2021-10-06 |
| SG11202112189XA (en) | 2021-12-30 |
| TWI755064B (en) | 2022-02-11 |
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