CN105808161A - Reading method of bad sector data of hard disk - Google Patents

Abstract

The invention discloses a reading method of bad sector data of a hard disk, and belongs to the field of data recovery. The method comprises following steps of S1, loading the hard disk; S2, initializing; loading hard disk state information; S3, sending a data reading request to the hard disk; S4, requesting to access the position of an LBA (Logical Block Address) value; S5, reading a hard disk state bitmap file; and S6, returning data or reading data according to whether the LBA position requested to access is a recorded bad sector or not. The method has the advantages that an upper layer interface sends the data request to the physical hard disk, a firmware program will receive the LBA value of the upper layer request, the firmware program will actively judge whether the position can be requested to access or not according to the LBA value; the access is requested in a DMA mode or a PIO mode; when the access cannot be carried out or the access results in the hang phenomenon of the hard disk, the firmware program will actively control the hard disk to restart attempted reading; and the condition that the data of the logic bad sector of the mechanical hard disk cannot be read can be solved successfully based on the method provided by the invention.

Description

A kind of read method of bad track of hard disk data

Technical field

The present invention relates to data and recover field, particularly to the read method of a kind of bad track of hard disk data.

Background technology

Along with the arrival in " big data " epoch, " data " this abstract thing, become more and more concrete in our life.Big from the energy, economy, communication, little of individual privacy, Company File, many important data messages, all can be stored in storage medium.Hard disk, as the data storage medium of PC, is widely used in each field, and mechanical hard disk is due to its capacity and cost advantage, has irreplaceable market share.

Bad track of hard disk is divided into logistic bad track and physical bad track, the logistic bad track Producing reason of hard disk is generally mostly due to use or the misoperation of software, and the reason such as abnormal shutdown, dust, vibration, electrostatic and high temperature, in the routine use process of hard disk, owing to a variety of causes occurs that bad track may result in data and cannot normally read.

Disk state message bit pattern: 1bit records a sectors status, and 0 represents and cannot read, and 1 represents and can read；

LBA (LogicalBlockAddress), Chinese: logical block addresses.

Summary of the invention

The present invention is directed to the deficiencies in the prior art, it is provided that the read method of a kind of bad track of hard disk data, this method mainly solves the situation that the data of mechanical hard disk logistic bad track cannot read.

For solving problem above, the technical solution used in the present invention is as follows: the read method of a kind of bad track of hard disk data, comprises the following steps:

S1 loads hard disk；S2 initializes, and loads disk state information；S3 sends data read request to hard disk；S4 request accesses the position of LBA value；S5 reads disk state bitmap file；Whether the LBA position that S6 accesses according to request is that the bad track recorded carries out data return or data read operation.

As preferably, if new hard disk, then needing to initialize hard disk；If the hard disk loaded before, being then loaded directly into disk state information, namely load the status file of hard disk, status file comprises message bit pattern.

As preferably, S6 is specific as follows:

S61: if the LBA position that request accesses is the bad track recorded, then directly return 0x44 and forward S62 to；If not recording the LBA position that request accesses, or the LBA position that request accesses is normal, then forward S63 to；

S62: if Unrecorded LBA position, then send according to request and once read instruction；If request LBA position is normal, directly transmit read requests；

S63: read unsuccessfully if Unrecorded, then need to update mode bit map file, uses the state of sector corresponding to bit position one LBA value of record, and wherein 0 represents and cannot read, and 1 expression is read successfully；

S64: update after completion status bitmap file, if can read successful data directly return data pool, the direct return 0x44 that reads of failing is to data pool.

Beneficial effects of the present invention is as follows: upper interface sends request of data to physical hard disk, firmware program can receive the LBA value of upper layer request, according to LBA value, firmware program can actively judge whether this position, place can ask to access, dma mode and PIO mode ask to access, can not accessing or this access causes the seemingly-dead phenomenon of hard disk, firmware program can actively control hard disk and restart trial reading, and the method based on the present invention can successfully solve the situation that the data of mechanical hard disk logistic bad track cannot read.

Accompanying drawing explanation

Fig. 1 is the schematic flow sheet of the present invention.

Detailed description of the invention

For making the purpose of the present invention, technical scheme and advantage clearly understand, develop simultaneously embodiment referring to accompanying drawing, the present invention is described in further details.

A kind of read method of bad track of hard disk data, when upper interface sends request of data to physical hard disk, firmware program can receive the LBA value of upper layer request, according to LBA value, firmware program can actively judge whether this position, place can ask to access, dma mode and PIO mode ask to access, it is impossible to access or this access causes the seemingly-dead phenomenon of hard disk (most of bad track hard disks there will be this situation), and firmware program can actively control hard disk and restart trial reading.

Specific as follows: S1 loads hard disk；S2 initializes, and loads disk state information；S3 sends data read request to hard disk；S4 request accesses the position of LBA value；S5 reads disk state bitmap file；Whether the LBA position that S6 accesses according to request is that the bad track recorded carries out data return or data read operation.

S2: if new hard disk, then need to initialize hard disk；If the hard disk loaded before, being then loaded directly into disk state information, namely load the status file of hard disk, status file comprises message bit pattern.

S6 is specific as follows:

S61: if the LBA position that request accesses is the bad track recorded, then directly return 0x44 and forward S62 to；If not recording the LBA position that request accesses, or the LBA position that request accesses is normal, then forward S63 to；

S62: if Unrecorded LBA position, then send according to request and once read instruction；If request LBA position is normal, directly transmit read requests；

S63: read unsuccessfully if Unrecorded, then need to update mode bit map file, uses the state of sector corresponding to bit position one LBA value of record, and wherein 0 represents and cannot read, and 1 expression is read successfully；

S64: update after completion status bitmap file, if can read successful data directly return data pool, the direct return 0x44 that reads of failing is to data pool.

Claims (3)

1. the read method of bad track of hard disk data, it is characterised in that comprise the steps:

S1 loads hard disk；S2 initializes, and loads disk state information；S3 sends data read request to hard disk；S4 request accesses the position of LBA value；S5 reads disk state bitmap file；Whether the LBA position that S6 accesses according to request is that the bad track recorded carries out data return or data read operation.

2. the read method of a kind of bad track of hard disk data according to claim 2, it is characterised in that S2 is specific as follows: if new hard disk, then need to initialize hard disk；If the hard disk loaded before, being then loaded directly into disk state information, namely load the status file of hard disk, status file comprises message bit pattern.

3. the read method of a kind of bad track of hard disk data according to claim 3, it is characterised in that S6 is specific as follows:

S61: if the LBA position that request accesses is the bad track recorded, then directly return 0x44 and forward S62 to；If not recording the LBA position that request accesses, or the LBA position that request accesses is normal, then forward S63 to；

S62: if Unrecorded LBA position, then send according to request and once read instruction；If request LBA position is normal, directly transmit read requests；

S63: read unsuccessfully if Unrecorded, then need to update mode bit map file, uses the state of sector corresponding to bit position one LBA value of record, and wherein 0 represents and cannot read, and 1 expression is read successfully；

S64: update after completion status bitmap file, if can read successful data directly return data pool, the direct return 0x44 that reads of failing is to data pool.