KR20120097228A - Method for writing data and apparatuses using the method - Google Patents

Abstract

PURPOSE: A data writing method and an apparatus performing the same are provided to store data to be written in a block in a cache in generation of write fault. CONSTITUTION: A preamplifier(16) senses an abnormal situation that first data is written in a first block by using a head. The preamplifier generates a write unsafe signal. An HDC(Hard Disc Controller)(22) senses write fault based on the write unsafe signal. The HDC transmits the first data to a cache. The HDC transmits second data to a read/write channel circuit in order to write the second data in a second block by using the head. [Reference numerals] (16) Preamplifier; (20) Read/write channel circuit; (32) Spindle motor driving unit; (34) VCM driving unit

Description

Method for writing data and apparatuses using the method

An embodiment according to the concept of the present invention relates to a hard disk drive. In particular, a data write method and a method for performing the data write method which can improve the performance of the hard disk drive by reducing unnecessary time when a write fault occurs can be performed. To devices that are present.

The hard disk drive includes a head and a disk. When the head deviates from the target track of the disc by an external impact or the like, a write fault may occur.

In general, when the write fault occurs, the hard disk drive performs a write retry operation.

As a result of the write retry operation, the hard disk drive consumes time for accessing the location where the write fault occurred again.

Therefore, the technical problem to be achieved by the present invention is to write data to write to the block in which the write fault occurs in the cache instead of the write retry operation in the event of a write fault data write that can improve the performance of the hard disk drive It is to provide a method and apparatuses capable of performing the method.

According to an embodiment of the present invention, a data write method of a hard disk drive may include detecting a write fault in a first block in which first data is to be written, and when the write fault is detected in the first block. Storing the first data in a cache, and writing the second data to the second block.

According to an embodiment, the data writing method of the hard disk drive may further include rewriting the first data stored in the cache to the first block.

The first block includes a sector from which the light fault is sensed to a sector before the head is on-track.

The second block includes a sector on which the head is on-tracked after detecting the light fault.

According to an exemplary embodiment of the present invention, a hard disk drive may include a disk including a first block and a second block, a head for accessing the disk, and an abnormal situation of writing first data to the first block using the head. A preamplifier for detecting and generating a write unsafe singal, and detecting a write fault based on the write unsafe signal and transmitting the first data to a cache and And a hard disk controller for transmitting the second data to the read / write channel circuit to write the second data to the second block using a head.

The hard disk controller may include a write fault detector for detecting the write fault based on the write unsafe signal, an interface for transmitting the first data to the cache according to the detection result, and the second data. And a disk formatter for transmitting the second data to the read / write channel circuit for writing to two blocks.

According to an embodiment, the hard disk controller transmits the first data to the read / write channel circuit to rewrite the first data stored in the cache to the first block.

The first block includes a sector from which the light fault is sensed to a sector before the head is on-track.

The second block includes a sector on which the head is on-tracked after detecting the light fault.

A data storage system according to an embodiment of the present invention includes a hard disk drive and a processor for controlling an operation of the hard disk drive. The data storage system is a computer.

According to an embodiment of the present invention, a data write method and a device capable of performing the method may store a data to be written in a block in which the write fault occurs in a cache instead of a write retry operation when a write fault occurs. This has the effect of improving the performance of the drive.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to more fully understand the drawings recited in the detailed description of the present invention, a detailed description of each drawing is provided.
1 is a schematic block diagram of a hard disk drive according to an embodiment of the present invention.
FIG. 2 is a schematic block diagram of the hard disk controller shown in FIG. 1.
FIG. 3 shows a diagram of any one of the plurality of disks shown in FIG. 1.
4 shows a diagram of the sectors shown in FIG. 3.
5 is a flowchart illustrating a data writing method operation of a hard disk drive according to an exemplary embodiment of the present invention.
6 shows simulation results of a conventional technology and a hard disk drive according to an embodiment of the present invention.
7 is a schematic block diagram of a data storage system including a hard disk drive according to an embodiment of the present invention.

It is to be understood that the specific structural or functional descriptions of embodiments of the present invention disclosed herein are only for the purpose of illustrating embodiments of the inventive concept, But may be embodied in many different forms and is not limited to the embodiments set forth herein.

Embodiments in accordance with the concepts of the present invention are capable of various modifications and may take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. It should be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms disclosed, but includes all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are intended to distinguish one element from another, for example, without departing from the scope of the invention in accordance with the concepts of the present invention, the first element may be termed the second element, The second component may also be referred to as a first component.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions describing the relationship between components, such as "between" and "immediately between," or "neighboring to," and "directly neighboring to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, the terms "comprises ", or" having ", or the like, specify that there is a stated feature, number, step, operation, , Steps, operations, components, parts, or combinations thereof, as a matter of principle.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings.

1 is a schematic block diagram of a hard disk drive according to an embodiment of the present invention.

Referring to FIG. 1, a hard disk drive (HDD) 100 used as a data storage device includes a plurality of disks 10, a plurality of heads 12, a head assembly 14, a preamplifier 16, a circuit. A block 18, a motor control unit (or servo control unit 30), a spindle motor 36, and a voice coil motor (VCM) 38 are included.

Each of the plurality of disks 10 can store data output from the host and is rotated by the spindle motor 36. Each of the plurality of heads 12 is positioned above the corresponding one of the plurality of disks 10 to perform a read operation or a write operation, and the VCM 38 and It is installed on each of the support arms extending from the combined head assembly 14 toward the disks 10.

When reading data stored in any one of the plurality of disks 10, the preamplifier 16 amplifies the analog read signal output from any one of the plurality of heads 12 and amplifies the analog read signal. Is output to the read / write channel circuit 20.

When writing data to any one of the plurality of disks 10, the preamplifier 16 outputs a write signal output from the read / write channel circuit 20, for example, a write current, from among the plurality of heads 12. Send to one head. Therefore, any one head may write the write signal to any one of the plurality of discs 10.

When writing data to any one of the plurality of disks 10, the preamplifier 16 includes a write unsafe detector 17 for detecting an abnormal situation.

The write unsafe detector 17 may generate a write unsafe signal based on the write current or the write data input frequency.

For example, the write unsafe detector 17 generates the write unsafe signal when the write current is too small or the write data input frequency is too low.

The read / write channel circuit 20 converts the analog read signal amplified by the preamplifier 16 into read data and outputs read data RDATA to a hard disc controller (HDC) 22. . The read / write channel circuit 20 converts the write data WDATA output from the HDC 22 into a write signal and outputs the converted write signal to the preamplifier 16.

When writing to any one of the plurality of disks 10, the HDC 22 outputs write data output from the host to the read / write channel circuit 20 under the control of the CPU 24. Accordingly, the write data output from the host may be transferred to any one of the plurality of discs 10 through one of the read / write channel circuit 20, the preamplifier 16, and the plurality of heads 12. Can be written to one.

When the HDC 22 reads data contained in any one of the plurality of discs 10, the HDC 22 read data decoded by the read / write channel circuit 20 under the control of the CPU 24. The RDATA may be received, error correction may be performed on the read data RDATA, and the error corrected data may be transmitted to the host through the interface.

The CPU 24 reads the control code or the boot code stored in the ROM 26 and stores it in the RAM 28 and based on the control code or the boot code stored in the RAM 28 or the HDD 100 or the like. Overall operation of the HDC 22 can be controlled. Therefore, the CPU 24 may control the read operation or the write operation of the HDD 100.

The portion of RAM 28 may be used as a cache 27 to quickly access data on the plurality of disks 10.

The cache 27 stores the most recently accessed data.

The HDC 22 detects a write fault in a block in which data is to be written based on the write unsafe signal output from the write unsafe detector 17, and writes to the block in which the write fault is detected. The data is transmitted to the cache 27. The operation of the HDC 22 when a light fault is detected is described in detail later.

According to an embodiment, the ROM 26 and the RAM 28 may be implemented as one memory device.

The buffer memory 29 may temporarily store data exchanged between the HDD 100 and the host. According to an embodiment, the buffer memory 29 may be implemented outside the circuit block 18.

According to an embodiment, the circuit block 18 including the read / write channel circuit 20, the HDC 22, the CPU 24, the ROM 26, the RAM 28, and the buffer memory 29 is one. Chip, for example, a system on chip (SoC). In addition, the motor control block 30 including the spindle motor driver 32 and the VCM driver 34 may be implemented with one chip, for example, an SoC.

FIG. 2 is a schematic block diagram of the hard disk controller shown in FIG. 1.

1 and 2, the HDC 22 transmits and receives data to and from the buffer memory 29 through a buffer controller (or buffer interface) 40.

The servo controller 42 controls the operation of the motor control block 30, for example, the spindle motor driver 32 and the operation of the VCM driver 34 under the control of the CPU 24.

The ECC controller 44 may generate ECC for the read data RDATA output from the read / write channel circuit 20 and transmit error corrected data to the host through the host interface 46.

HDC 22 communicates with a host via host interface 46.

HDC 22 communicates with ROM 26 or RAM 28 via RAM interface 47.

HDC 22 communicates with CPU 24 via CPU interface 48.

The light fault detector 49 detects a light fault in a block in which data is to be written based on the light unsafe signal generated by the light unsafe detector 17.

When the write fault is detected in the block in which the data is to be written, the HDC 22 transmits the data to be written to the cache 27 through the RAM interface 47 to the block where the write fault is detected. .

In the write operation, the disk formatter 50 may transmit the write data or the write data stored in the buffer memory 29 to the read / write channel 20 output from the host and input through the host interface 46. According to an embodiment, the write data output from the host may be temporarily stored in the buffer memory 29 and then transmitted to the read / write channel 20 through the disk formatter 50 under the control of the CPU 48.

In the read operation, the disk formatter 50 may transmit read data transmitted from the read / write channel 20 to the buffer memory 29, the host interface 46, or the CPU interface 48. According to an embodiment, read data transmitted through the read / write channel 20 and the disk formatter 50 may be temporarily stored in the buffer memory 29 and then transferred to the host interface 46 under the control of the CPU 48. Can be.

FIG. 3 shows a diagram of any one of the plurality of disks shown in FIG. 1, and FIG. 4 shows a diagram of the sectors shown in FIG. 3.

1 to 4, any one of the plurality of disks 10 includes a plurality of tracks T1, T2, T3,..., And Tn. The disk 101 can be divided into a plurality of sectors. A block represents a collection of sectors.

HDC 22 receives data D1, D2, D3, and D4 from the host via host interface 46.

A write operation for writing the data D1, D2, D3, and D4 to the disc 101 is performed.

After the data D1 is successfully written to the block A1, a write operation of writing the data D2 to the block A2 is performed.

During the write operation of writing the data D2 to the block A2, any one of the plurality of heads 12 corresponding to the disk 101 is caused by an external impact or the like. Can escape.

When either of the heads leaves the target track T2 of the disc 101, the write unsafe detector 17 generates a write unsafe signal.

The light fault detector 49 detects a light fault in the block A2 in which the data D2 is to be written based on the light unsafe signal generated by the light unsafe detector 17.

When the write fault is detected in the block A2 in which the data D2 is to be written, the HDC 22 writes the data D2 to write to the block A2 in which the write fault is detected through the RAM interface 47. To the cache 27. The cache 27 stores the data D2.

Block A2 ranges from sector 50 where the light fault is detected to sector 99 before any one of the heads is on-track.

After the cache 27 stores the data D2, a write operation of writing the data D3 to the block A3 is performed.

Block A3 has a range from sector 100 to sector 256 where the one head is on-tracked after detecting the light fault.

A write operation of writing data D4 to block B1 is performed.

After a write operation of writing the data D4 to the block B1, an operation of rewriting the data D2 stored in the cache 27 to the block A2 is performed.

5 is a flowchart illustrating a data writing method operation of a hard disk drive according to an exemplary embodiment of the present invention.

1 to 5, the light fault detector 49 detects a light fault in the block A2 where the data D2 is to be written based on the light unsafe signal generated by the light unsafe detector 17. (S10).

When the write fault is detected in the block A2 in which the data is to be written, the HDC 22 caches the data D2 to write to the block A2 in which the write fault is detected through the RAM interface 47. Transfer to (27). The cache 27 stores the data D2 (S20).

After the cache 27 stores the data D2, a write operation of writing the data D3 to the block A3 is performed (S30).

A write operation of writing data D4 to block B1 is performed.

After a write operation of writing the data D4 to the block B1, an operation of rewriting the data D2 stored in the cache 27 to the block A2 is performed (S40).

 6 shows simulation results of a conventional technology and a hard disk drive according to an embodiment of the present invention.

1 to 6, a write operation for writing data D1, D2, D3, and D4 to the disk 101 is performed, and any one of the plurality of heads 12 is used to write the disk 101. Assume that the time taken for full rotation is 11.1 ms.

Conventional techniques perform a write retry operation when data D2 detects a write fault in block A2.

Thus, when a write fault is detected in the block A2 where the data D2 is to be written, the conventional technique takes 19.4 (= 11.1 + 8.3) ms.

11.1 ms is the time for which any one head rotates the disc 101 completely to perform the write retry operation, and 8.3 ms is the time for the data D1, D3, and D4 to block blocks D1, D3, and It takes time to write to B1).

When a write fault is detected in the block A2 in which the data D2 is to be written, the present invention takes 13.9 (= 11.1 + 2.8) ms.

11.1 ms is the time that the data D1, D3, and D4 have been written to the blocks A1, A3, and B1, and 2.8 ms is the cache 27 storing the data D2 and blocking the data D2 ( It is the time written in A2).

Therefore, the data writing method of the hard disk drive according to the present invention can save about 30% time over the conventional technology.

7 is a schematic block diagram of a storage system including a hard disk drive according to an embodiment of the present invention.

1 to 7, the data storage system 200 includes all of CE (consumer equipment) capable of processing or storing data. For example, the CE may be a hard disk recorder (HDD recorder), a mobile phone, a smartphone, a personal digital assistant (PDA), a computer (e.g., a PC, a laptop, etc.), a navigator device, a home automatic system. , A music player (MP3 player), a camcorder (camcorder), a video player (such as a DVIX player), a storage server, a portable multimedia player (PMP), and the like.

The data storage system 200 includes an HDD 100 and a processor 210 connected to each other via a system bus 202. The HDD 100 and the processor 210 may perform data communication according to the SATA communication protocol.

The processor 210 may control the overall operation of the HDD 100, for example, a write operation or a read operation.

In the data write method of the HDD 100 according to an embodiment of the present invention described with reference to FIGS. 1 to 7, when a write fault is detected, data to be written to the block in which the write fault is detected is stored in the cache 27.

The data storage system 200 may further include a first interface 220. The first interface 220 may be an input / output interface. The input / output interface may be an output device such as a monitor or a printer, or an input device such as a mouse or a keyboard.

The data storage system 200 may further include a second interface 230. The second interface 230 may be a wireless communication interface for wireless communication with the external storage system.

Accordingly, the second interface 230 may wirelessly transmit data stored in the HDD 100 to an external storage system or transmit data transmitted from the external storage system to the HDD 100 under the control of the processor 210.

When the data storage system 200 is implemented as a hybrid HDD, the data storage system 200 may further include a nonvolatile memory device. The processor 210 may store data in the HDD 100 or the nonvolatile memory device according to a data storage policy.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

10: multiple disks
12: multiple heads
14: head assembly
16: preamplifier
17: write unsafe detector
18: circuit block
22: hard disk controller
27: cache
29: buffer memory
30: motor control unit
36: spindle motor
38: Voice Coil Motor (VCM)
100: hard disk drive

Claims (10)

Detecting a write fault in the first block in which the first data is to be written;
Storing the first data in a cache when the write fault is detected in the first block; And
And writing the second data to the second block. The method of claim 1, wherein the data writing method of the hard disk drive comprises:
And rewriting the first data stored in the cache to the first block. The method of claim 1, wherein the first block,
And a sector from which the write fault is detected to a sector before the head is on-track. The method of claim 1, wherein the second block,
And a sector in which a head is on-tracked after the write fault is detected. A disk comprising a first block and a second block;
A head for accessing the disk;
A preamplifier (16) for detecting an abnormal situation while writing first data to the first block using the head to generate a write unsafe singal; And
The second data is detected to detect a write fault based on the write unsafe signal, transmit the first data to the cache, and write the second data to the second block using the head. Hard disk drive comprising a hard disk controller (22) to the lead / write channel circuit. The method of claim 5, wherein the hard disk controller,
A light fault detector (49) for detecting the light fault based on the write unsafe signal;
An interface (47) for transmitting the first data to the cache according to the detection result; And
And a disk formatter (50) for transferring the second data to the read / write channel circuit to write the second data to the second block. The method of claim 5, wherein the hard disk controller,
And transferring the first data to the read / write channel circuit to rewrite the first data stored in the cache to the first block. The method of claim 5, wherein the first block,
And a sector from which the write fault is detected to a sector before the head is on track. The method of claim 5, wherein the second block,
And a sector on which the head is on-tracked after the write fault detection. A hard disk drive according to claim 5; And
And a processor for controlling the operation of the hard disk drive.

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