KR100417227B1 - Method for improving quality of hard disk drive by re-writing data having correctable error - Google Patents

Abstract

PURPOSE: A method for improving quality of an HDD(Hard Disk Drive) by re-writing data having a correctable error is provided to restore read data having an error by using an ECC(Error Correction Code) if the data can normally be restorable, thereby preventing performance of an HDD from being influenced by the error. CONSTITUTION: A micro controller decides whether a data read request is received from a host(100). If so, the micro controller reads data and a recorded ECC corresponding to the data(102). The micro controller decides whether an error corresponding to the ECC exists(104). If so, the micro controller decides whether the data can be restorable by using the ECC(106). If so, the micro controller restores the data by using the ECC(108), and re-writes the restored data on a disk(110). The micro controller re-reads the restored data from the disk(112), and decides whether an error exists(114). If so, the micro controller continues the error correction/re-writing process.

Description

How to improve the quality of hard disk drive by re-writing error correctable data

The present invention relates to a hard disk drive, and more particularly, to a method of improving the quality of a hard disk drive by re-writing error correctable data.

Hard disk drives usually consist of a combination of several components. Therefore, if the hard disk drive is used for a long time, the quality of the hard disk drive is deteriorated due to the aging of components. In particular, since the head and the disk, which are the key components, are in physical contact, their deterioration directly affects the quality of the hard disk drive. In addition, data may be difficult to recover due to off-track write or any disturbance. Therefore, the error correction and retry technique using ECC (Error Correction Code) is used to correct such errors in hard disk drive technology. However, this technique is only performed when the actual data coincides with the ECC at the time of data reading.

Therefore, the actual data on the disk is damaged, but error correction and retry is performed on error-recoverable data by error correction and retry technique using Error Correction Code (ECC). Technology is desired.

Accordingly, an object of the present invention is to provide a method for performing error correction on data that can be restored normally by error correction and retry technique, although actual data is damaged when data is read.

According to the above object, in the present invention, the actual data is damaged when reading the data, but the error correction is performed on the data that can be restored normally by the error correction and retry technique, and the process of writing and confirming again on the disk is performed.

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

1 is a block diagram of a conventional hard disk drive. Referring to FIG. 1, the disks 10 are rotated by a spindle motor 34. The heads 12 are located on the corresponding one of the disks 10 and face the disks 10 from an E-block assembly 14 coupled with a rotary voice coil actuator 30. It is installed corresponding to each of the support arms extending toward. The preamplifier 16 preamplifies the signal picked up by one of the heads 12 at the time of read and applies the analog read signal to the read / write channel circuit 18, and at the time of write. Encoded write data applied from the read / write channel circuit 18 is written onto the disc through the corresponding one of the heads 12. The read / write channel circuit 18 detects and decodes a data pulse from the read signal applied from the preamplifier 16 and applies the read / write channel circuit 18 to the DDC (Disk Data Controller) 20, and writes the write data applied from the DDC 20. Decode and apply to preamplifier 16. The DDC 20 is controlled by the microcontroller 24 and writes data received from the host computer through the read / write channel circuit 18 and the preamplifier 16 onto the disc or reads data from the host. Send to a computer. The DDC 20 also interfaces the communication between the host computer and the microcontroller 24. The buffer RAM 22 temporarily stores data transferred between the host computer, the microcontroller 24 and the read / write channel circuit 18. The microcontroller 26 controls the DDC 20 in response to read or write commands received from the host computer and controls track search and track following. The ROM 26 stores the execution program of the microcontroller 24 and various setting values. The servo driver 28 generates a driving current for driving the actuator 30 by a signal for controlling the position of the heads 12 generated from the microcontroller 24 and applies it to the voice coil of the actuator 30. . The actuator 30 moves the heads 12 on the disks 10 in correspondence with the direction and level of the drive current applied from the servo driver 28. The spindle motor driver 32 rotates the disks 10 by driving the spindle motor 34 according to a control value for the rotation control of the disks 10 generated from the microcontroller 24. The disk signal controller 36 generates various timing signals necessary for read / write, decodes the servo information, and applies it to the microcontroller 24.

In a typical hard disk drive as shown in FIG. 1, when reading data, the types of data read can be divided into three types.

First, if there is no error corresponding to ECC in the data

Second, if there is an error corresponding to ECC in the data, but it can be restored using ECC

Third, if there is an error corresponding to ECC in the data and restoration is impossible using ECC.

In case of the second case, if the quality of the head and the disc is deteriorated over time, or the influence of disturbance is the case, the third case is the same. In such a case, data restoration becomes impossible.

Therefore, in the present invention, in the case of the second case, error correction is performed, and then the data in the case of the first case is converted by re-writing to the disc. Doing so improves the reliability and quality of the hard disk drive.

2 is a control flowchart performed by the microcontroller 24 when the second case is described above, that is, when an error exists in the data corresponding to the ECC but can be restored using the ECC.

Referring to FIG. 2, the microcontroller 24 determines whether there is a data read request from the host in step 100, and proceeds to step 102. In step 102, the microcontroller 24 reads the recorded ECC corresponding to the data and the data from the disc 10 based on the read request. After that, the flow proceeds to step 104 to determine whether an error exists in the read data corresponding to the ECC in the data.

If the error does not exist, the first case described above is terminated, and thus the control process is terminated. However, if there is an error, the flow proceeds to step 106 to determine whether data can be restored using the ECC. If the read data can be restored using the ECC, the microcontroller 24 proceeds to step 108 to restore the read data to the readable data using the ECC. Thereafter, the microcontroller 24 proceeds to step 110 to re-write the restored data on the disk 10.

The microcontroller 24 then proceeds to step 112 and reads reconstruction data from the disc 2 again. Thereafter, it is determined whether an error exists in the reconstruction data read back in step 114 corresponding to the ECC. If there is an error, proceed to step 102 and repeat the steps from then on. That is, error correction and re-write are continuously performed on the data.

However, if there is an error corresponding to the ECC in the reconstructed data in step 114, the first case described above is the microcontroller 24 ends the control process of FIG.

The control operation of the present invention does not affect the disk drive performance because the operation is performed by the hard disk drive alone regardless of the host.

As described above, the present invention performs error correction on the data that can be restored normally by error correction and retry technique, but repeatedly writes and checks the data on the disk by error correction and retry technique, and restores the damaged data to normal. Make it the restored data. By the embodiment of the present invention, the reliability and quality of the hard disk drive are improved.

1 is a block diagram of a conventional hard disk drive

2 is a control flowchart according to an embodiment of the present invention.

Claims (2)

In the method of improving the quality of a hard disk drive by re-writing error correctable data, A first step of reading data from the disk and an error correction code recorded corresponding to the data when there is a data read request from the host; A second step of determining whether an error exists in the read data corresponding to the error correction code in the data and whether data can be restored using the error correction code; If an error exists in the data read in the second process corresponding to the error correction code, but it is determined that the data can be restored using the error correction code, the read data in which the error exists using the error correction code The third process of restoring, A fourth step of rewriting and rereading the restored data on the disc; And a fifth process of terminating the process if an error does not exist in the restored data read back in the fourth process in response to the error correction code. The method of claim 1, further comprising: repeating the process from the first process if an error exists in the restored data read back in the fourth process corresponding to the error correction code.