KR100217750B1 - Prevention method for data transmission error - Google Patents

Abstract

end. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer error prevention method for a hard disk drive.

I. SUMMARY OF THE INVENTION The present invention provides a method for preventing a data transmission error between a disk and a host computer during a data read / write operation of a hard disk drive.

All. According to an aspect of the present invention, there is provided a method for preventing data transmission errors in a hard disk drive, the method comprising: providing an address to data transmitted from a host computer; And transmitting the read data only when an address assigned to each sector and an address of a target sector to be transmitted are the same when the read data is transmitted.

la. An important application of the invention is that it can be used to transfer data between a disk and a host computer.

Description

How to prevent data transmission errors

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data transfer of a hard disk drive, and more particularly, to a method of preventing a data transmission error between a disk and a host computer.

[0002] A hard disk drive (HDD) stores data transferred from a host computer in a magnetic form on a disk as a recording medium, reads data corresponding thereto upon receipt of a data read command and transfers the read data to a host computer, . The main function of the hard disk drive can be broadly divided into data data read / write operations as described above. The data read operation is important in terms of reproducing data that is written on the disk after a certain period of time. I would say. Hereinafter, the operation of each component in the data read / write operation will be described with reference to FIG. 1 showing the configuration of the hard disk drive.

FIG. 1 is a block diagram of a conventional hard disk drive. FIG. 1 shows an example of a hard disk drive having two disks 10 and four heads 12 corresponding thereto. Referring to FIG. 1, the disks 10 are mounted on a drive shaft of a spindle motor 34 in the form of a stack and rotate, and each disk surface corresponds to one head 12. The format of a predetermined track arranged concentrically on each disk 10 is as shown in FIG. 2A. 2A shows a sector format diagram of a predetermined track arranged concentrically on the disk 10. Each track is composed of a servo sector in which servo information is recorded and a data sector in which data transmitted from the host computer is recorded . If the sector format of the hard disk drive is a Hearderless scheme, the data sector can be divided into a data area for recording actual user data and an error correction code (ECC) area for error correction as shown in FIG. 2A have. While the head 12 is mounted on a vertically elongated arm 14 of an arm assembly of a rotary voice coil motor (VCM) 28 located on the surface of the disk 10 . The preamplifier 16 pre-amplifies the signal picked up by one of the heads 12 during data read and applies the analog read signal to the read / write channel circuit 18 When the data is written, the encoded write data (Encoded Write Data) applied from the read / write channel circuit 18 is written on the disk 10 through the switching selected head 12. At this time, the preamplifier 16 switches and selects one of the heads 4 under the control of a disk data controller (DDC) The read / write channel circuit 18 decodes the read signal applied from the preamplifier 16 to generate lead data RDATA, encodes the write data WDATA applied from the disk data controller 36, and outputs the read data RDATA to the preamplifier 16 . The read / write channel circuit 18 also demodulates head position information, which is a part of the servo information written on the disk 10, to generate a position error signal (PES). The PES generated from the read / write channel circuit 18 is applied to the A / D converter 20 and the A / D converter 20 converts the applied PES to a digital step value corresponding to its level, 22). The disk data controller 36 writes the data received from the host computer on the disk 10 via the read / write channel circuit 18 and the preamplifier 16 or writes the data read from the disk 10 to the host computer . The disk data controller 36 also interfaces communication between the host computer and the microcontroller 22.

On the other hand, the microcontroller 22 controls the disk data controller 36 in response to a data read / write command received from the host computer, and controls track search and track following. At this time, the microcontroller 22 controls the track following by using the PES value inputted from the A / D converter 20, and in response to various servo control related signals outputted from a gate array (not shown) Control is performed. The D / A converter 24 converts the control value for controlling the position of the heads 12 generated from the microcontroller 22 into an analog signal and outputs the analog signal. The VCM driving unit 26 generates a current I (t) for driving the actuator by a signal applied from the D / A converter 24 and applies the current I (t) to the VCM 28. The VCM 28 positioned on the other side of the actuator having the heads 12 on one side is configured to move the heads 12 horizontally on the disk 10 corresponding to the direction and the level of the current input from the VCM driver 26 . The motor control unit 30 controls the spindle motor driving unit 32 according to a control value for controlling the rotation of the disks 10 generated from the microcontroller 22. [ The spindle motor driving unit 32 drives the spindle motor 34 in accordance with the control of the motor control unit 30 to rotate the disks 10. The buffer memory 38 connected to the disk data controller 36 temporarily stores data transmitted between the disk 10 and the host computer under the control of the disk data controller 36.

Hereinafter, a data transfer process when reading or writing predetermined data in a conventional hard disk drive having the above-described configuration will be described. First, data read from a predetermined data sector (hereinafter referred to as a sector) is transferred to the buffer memory 38 through the disk data controller 36. If there is an error in the sector area to be read, the error in the read data is corrected using the information recorded in the ECC area in the same sector, and the error is transmitted to the buffer memory 38. On the other hand, at the time of the data write, the data transmitted from the host computer is temporarily stored in the buffer memory 38, and the data is transmitted to the disk 10 by attaching ECC to the transmitted data. The designation of an address for reading / writing data on the normal buffer memory 38 is determined by the value of a DAP (Disk Address Pointer) register provided in the disk data controller 36. The DAP register is incremented by 1 each time data of one sector is transferred after being initially set by the control of the microcontroller 22 immediately before performing a data read / write operation. When the data stored in the buffer memory 38 is transferred to the host computer, the designation of the address where data to be transferred is stored is determined by the value of a HAP (Host Address Pointer) register provided in the disk data controller 36 . The HAP register is also initialized by the control of the microcontroller 22 immediately before transferring data to the host computer, and is incremented by 1 each time data for one sector is transferred. However, in the conventional hard disk drive, when data is transferred from the buffer memory 38 to the host computer or when data is transferred from the buffer memory 38 to the disk 10, it can not be confirmed whether the desired data is normally transferred There was a problem. That is, in the conventional hard disk drive, if an address on the buffer memory 38 is erroneously designated due to an error of the disk data controller 36, a data transmission error may occur.

Accordingly, it is an object of the present invention to provide a method for preventing a data transmission error between a disk and a host computer during a data read / write operation of a hard disk drive.

1 is a block diagram of a general hard disk drive;

FIGS. 2A through 2C are a sector format diagram on a general disk and a sector format diagram according to an embodiment of the present invention. FIG.

3 is a flowchart of a process of a disk data controller 36 for explaining a process of setting a data LBA (Logic Block Address) according to an embodiment of the present invention.

FIG. 4 is a flowchart of a process of a disk data controller 36 for explaining a data write process according to an embodiment of the present invention.

FIG. 5 is a flowchart of a process of a disk data controller 36 for explaining a data read process according to an embodiment of the present invention.

FIG. 6 is a flowchart of a process of a disk data controller 36 for explaining a read data transmission error prevention process according to an embodiment of the present invention.

Hereinafter, an operation according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Many specific details are set forth in order to provide a more thorough understanding of the present invention, such as the number of data sectors, the sector format and the specific process flow described in the following description and accompanying drawings. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. In the following description, a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

FIG. 2B illustrates a sector format diagram according to an embodiment of the present invention. In order to implement the present invention, a data sector is composed of an LBA area, a data area, and an ECC area. The LBA area is an area in which an address of a sector in which data of one sector transmitted from the host computer is recorded is recorded. The data area and the ECC area are areas in which information for user data and data error correction are recorded, . If the sector format of each track concentrically arranged on the disk 10 has a sector format as shown in FIG. 2B, the signal read through the head 12 during data reading includes the LBA value for each sector and the corresponding data And is stored on the buffer memory 38 via the disk data controller 36 as RDATA decoded in the read / write channel circuit 18. [ The format of the data stored in the buffer memory 38 is as shown in FIG. 2C. That is, LBA indicating the address of the data sector is stored in the potential of the data read from each data sector. 3 to 6, a procedure for setting an LBA in data transmitted from a host computer and a process for preventing a data transmission error during a data read / write operation will be described.

FIG. 3 illustrates a process flow of a disk data controller 36 for explaining a data LBA setting process according to an embodiment of the present invention. 3, when a data write command is received from the host computer, the disk data controller 36 sets the data LBA of the first sector to be transmitted in the step 40 in the host LBA register, and then transmits data from the host computer Receive. When the data transfer is started, the disk data controller 38 checks if there is data transfer for one sector in step 42. If the data transfer for one sector is completed, the disk data controller 38 proceeds to step 44 to store the value of the host LBA register in the buffer memory 38 ). The disk data controller 36 increments the value of the host LBA register by 1 in step 46, and then returns to step 42 to repeat steps 42 to 46 described above. As a result, data transmitted from the host computer is temporarily stored on the buffer memory 38 together with the set LBA, and then transferred to the disk 10. [ Hereinafter, a process of writing data stored in the buffer memory 38 and a corresponding LBA to a predetermined data sector of the disk 10 will be described with reference to FIG.

FIG. 4 illustrates a process flow of a disk data controller 36 for explaining a data write process according to an embodiment of the present invention. Referring to FIG. 4, first, the disk data controller 36 sets the LBA of the first sector to be written in the disk LBA register in step 50, and then starts writing. Each time the sector is written, the disk data controller 36 compares the value of the current disk LBA register with the value of the LBA stored in the buffer memory 38 in step 52. If the value of the current disk LBA register is equal to the value of the LBA stored in the buffer memory 38, the disk data controller 36 proceeds to step 54 and checks whether data writing for one sector is completed. If the data of one sector is written to the disk data controller 36, the disk data controller 36 increments the value of the disk LBA register in step 56, and then returns to step 52 and repeats steps 52 through 58 described above. On the other hand, if the value of the disk LBA register is different from the value of the LBA stored in the buffer memory 38 as a result of comparison in step 52, the disk data controller 36 generates an interrupt in step 58 and outputs the interrupt to the microcontroller 22, And terminates the operation. The data reading process according to an embodiment of the present invention will now be described with reference to FIG.

FIG. 5 illustrates a process flow of a disk data controller 36 for explaining a data read process according to an embodiment of the present invention. 5, when the data read command is received from the host computer, the disk data controller 36 sets the LBA of the first sector to be read in the disk LBA register in step 60 and starts data reading. Every time data of every sector is read, the disk data controller 36 compares the value of the current disk LBA register with the value of the LBA of the read sector in step 62. If the LBA values are the same, the disk data controller 36 checks whether the data of one sector is read in step 64. If the data of one sector is read, the disk data controller 36 increments the value of the disk LBA register by 1 . Thereafter, the disk data controller 36 returns to step 62 and repeats steps 62 through 68 described above. On the other hand, if the LBA values are not equal to each other in step 62, the disk data controller 36 generates an interrupt in step 68 and outputs the interrupt to the microcontroller 22 to terminate the data read operation. Hereinafter, the process of transferring the read data from the buffer memory 38 to the host computer will be described with reference to FIG.

FIG. 6 is a flowchart illustrating a process of a disk data controller 36 for explaining a read data transmission error prevention process according to an embodiment of the present invention. Referring to FIG. 6, first, in step 70, the disk data controller 36 sets the LBA of the first sector to be transmitted in the host LBA register and then starts the read data transfer. The disk data controller 36 compares the value of the current host LBA register with the value of the LBA stored in the buffer memory 38 in step 72 before transferring the read data of each sector. If the LBA values are the same as the comparison result, the disk data controller 36 performs data transfer in step 74 and checks whether the transfer of one sector of the read data is completed in step 76. [ If the read data transfer for one sector is completed, the disk data controller 36 increments the value of the host LBA register by one in step 78, and then returns to step 72 to compare LBA values. Thereafter, the disk data controller 36 repeats steps 72 to 78 to transmit the read data. If the value of the current host LBA register is different from the value of the LBA stored in the buffer memory 38 as a result of the comparison in step 72, the disk data controller 36 generates an interrupt in step 80 and outputs the interrupt to the microcontroller 22, And terminates transmission of the data. Therefore, in the data read / write operation of the present invention, normal data transmission can be performed by comparing LBAs of data transmitted between the disk 10 and the host computer.

As described above, in the data read / write operation, the LBA of the data transmitted between the recording medium and the host computer is compared and retrieved, and only the data having the same LBA is transmitted, thereby preventing the loss of data due to the transmission error have.

Claims (3)

A data transfer error prevention method for a hard disk drive, A step of providing an address to data transmitted from a host computer, Recording the transferred data and the assigned address on the disk together; And transmitting the read data only when an address assigned to each sector and an address of a target sector to be transmitted are the same when the read data is transmitted. The method as claimed in claim 1, wherein the address is assigned when data transfer of one sector is completed from the host computer. 3. The method of claim 2, wherein the address is recorded in the same sector together with the data of one sector transmitted.