KR100350681B1 - Method for preventing data recording error - Google Patents

Abstract

PURPOSE: A method for preventing data recording error is provided to completely record data to a predetermined data area by using a difference of time points when power failure signals are generated, thereby preventing the hard defect error when reading the data. CONSTITUTION: A method for preventing data recording error includes the steps of testing whether data recording is completed in a predetermined data sector in response to the input of an initial power-failure signal from a reset circuit(60) or a servo driving part(40), and outputting a control signal for disabling a write gate(WG) by a DDC(disc data controller,30) if the data recording in the predetermined data section is finished. The first and second power-failure signals(PF1,PF2) output from the reset circuit or the servo driving part have different voltage levels from each other, and the initial power-failure signal is input to the predetermined data area where the data recording is carried out.

Description

How to prevent data logging errors.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to the prevention of data write errors in a disk drive recording apparatus, and more particularly to a method of preventing data errors caused by a data proxy power failure.

A disc drive recording device is a device for recording data on a rotating disc through a head or reading data recorded on a disc. As a result, a large amount of data can be accessed at high speed so that a secondary storage device of a current computer system can be used. It is widely used. Normally, when an external factor such as external shock and voltage drop occurs in the process of recording and reading data on a disc in a disc drive recording apparatus, accurate data cannot be processed. In particular, when data transferred from the host is recorded incorrectly on the disk, an error occurs continuously in the corresponding data sector every time data is read.

Hereinafter, a process of generating an error in data recording due to voltage drop among external factors such as external shock and voltage drop will be described with reference to FIGS. 1 and 2.

FIG. 1 is a schematic block diagram of a conventional disk drive recording apparatus for explaining a process of generating a recording error due to a data source power failure. FIG. 2 is a timing diagram of various signals according to the configuration of FIG. It is shown. First, in FIG. 1, the read / write channel circuit 10 detects and decodes a data pulse from a read signal applied from a preamplifier (not shown) to generate read data RDATA. The recording data WDATA applied from 30 is decoded and applied to the preamplifier 10. The read / write channel circuit 10 digitally converts the read signal and outputs the read signal as encoded read data (hereinafter referred to as an ERD signal). The gate array 20 detects and outputs servo information such as gray codes in the servo area of the disc from the ERD signal input from the read / write channel circuit 10. In addition, the gate array 20 outputs a write fault (WF) signal WF in response to a power failure signal PF1 (Power Fail) input from the servo driver 40 when a power failure occurs. The DDC (Disk Data Controller) 30 is controlled by the CPU 50 and writes data received from the host computer onto the disk 2 or reads from the disk 2 through the read / write channel circuit 10. The transmitted data to the host computer. In addition, the DDC 30 disables the write gate WG which is enabled when the write fault signal WF is input from the gate array 20. The servo driver 40 outputs a servo control signal (SCS) for controlling the spindle motor and the voice coil motor (VCM) under the control of the CPU 50. In addition, the servo driver 40 generates and outputs a power failure signal (significantly identical to the reset signal) PF1 when the power supply is suddenly "off" as a reset signal generating means. The CPU 50 controls the DDC 32 in response to read / write commands received from the host computer and controls track search and track following. Hereinafter, a process of generating a data recording error of a conventional disk drive recording apparatus having the above-described configuration will be described with reference to FIG. When the power supply of the disk drive recording apparatus during data recording is suddenly " off " at time T1, the servo driver 40 outputs the power failure signal PF1 in the enabled state at time T1. Since the power failure signal PF1 is input to the gate array 20, the write fault signal WF in the enabled state is output to the DDC 30 in the gate array 20. Thereafter, the DDC 30 disables the light gate WG being output in the enabled state in response to the input of the write fault signal WF. If the write fault signal WF occurs during recording in the data area N + 2 as shown in Fig. 2, the data write operation is stopped in the middle of the data area N + 2 section. That is, a light fault occurs. Therefore, in the case where the data fault region N + 2 section where the write fault occurs is read, a data error continues to occur, which causes a problem of being regarded as a hard defect.

Accordingly, an object of the present invention is to provide a method for preventing an error in data recording when a data proxy power failure of a disk drive recording apparatus occurs.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a data recording error prevention method of a disc drive recording apparatus including first and second reset signal generating means for generating and outputting first and second reset signals, respectively, when an input power is changed. ,

Checking whether data writing is completed in a predetermined data sector in response to the initial reset signal being input from the first or second reset means;

And in response to the data being written in the predetermined data sector as a result of the inspection, outputting a control signal for disabling the write gate.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 shows a schematic block diagram of a disk drive recording apparatus according to the present invention, and FIG. 4 shows timing diagrams of various signals according to the configuration of FIG. First, the disk drive recording apparatus according to the present invention includes two power failure signal PF1 and PF2 generating means to prevent an error in data writing when a power failure (i.e. voltage fluctuation) occurs during data writing. Referring to FIG. 3, first, when a voltage drop occurs, the reset circuit 60 generates a power failure signal PF1 and outputs it to the CPU 50 and the gate array 20. The CPU 50 which performs the overall control operation of the disk drive recording apparatus checks whether data is being recorded in response to the power failure signal PF1 input, and outputs the write fault signal WF to the DDC 30 upon completion of data writing. On the other hand, the DDC 30 disables the write gate WG applied to the read / write channel circuit 10 in the enabled state when there is an input of the write fault signal WF from the CPU 50. When the voltage drop occurs, the servo driver 40 generates a power failure signal PF2 and outputs it to the gate array 20, the CPU 50, and the DDC 30. At this time, the power failure signal PF2 has a voltage level lower than that of the power failure signal PF1 output from the reset circuit 60, and the gate array 20, the CPU 50, and the DDC 30 are reset by the power failure signal PF2. do.

Hereinafter, an operation for preventing a data write error when a data proxy voltage drop of the disk drive recording apparatus having the above-described configuration occurs will be described with reference to FIG.

First, if a voltage drop occurs while writing data in the data sector N + 2 section in FIG. Generates and outputs a power failure signal PF1. At this time, the CPU 50 checks whether data transmitted from the host computer is writing to the data area N + 2 in response to the power failure signal PF1 input. At this time, if data is being recorded, the CPU 50 outputs the write fault signal WF in the enabled state at the end of the data area N + 2 section. The DDC 30 that receives the write fault signal WF in the enabled state disables the write gate WG in the enable state being output to the read / write channel circuit 10. Thereafter, the gate array 20, the DDC 30, and the CPU 50 are reset by the power failure signal PF2 input from the servo driver 40. Since the occurrence of the power failure signal PF2 occurs tens of milliseconds [ms] after the occurrence of the power failure signal PF1, data can be recorded until the end of the predetermined data area. That is, even if a voltage drop occurs during data recording, the data transmitted from the host computer is completely recorded until the end of the predetermined data area, and then a write fault signal is generated, thereby preventing errors in data recording.

As described above, in the present invention, even when a data proxy power failure occurs, a hard defect error can be prevented when reading data by completely writing data in a predetermined data area by using a difference in time point of occurrence of a power failure signal. There is this.

1 is a schematic block diagram of a conventional disk drive recording apparatus for explaining a process of generating a recording error due to a data proxy power failure.

2 is a timing diagram of various signals according to the configuration of FIG.

3 is a schematic block diagram of a disc drive recording apparatus according to the present invention.

4 is a timing diagram of various signals according to the present invention.

Claims (3)

A data recording error prevention method of a disc drive recording apparatus comprising first and second reset signal generating means for generating and outputting first and second reset signals, respectively, when an input power source changes. Checking whether data writing is completed in a predetermined data sector in response to the input of the first reset signal from the first or second reset means; And outputting a control signal for disabling the write gate in response to the data recording being completed in the predetermined data sector as a result of the inspection. The method of claim 1, wherein the first and second reset signals respectively output from the first and second reset signal generating means have different voltage levels. 3. The method of claim 2, wherein the initial reset signal is input within a predetermined data area in which data is recorded.