CN105824716A

CN105824716A - Method for re-generating LDR file

Info

Publication number: CN105824716A
Application number: CN201610147917.3A
Authority: CN
Inventors: 梁效宁; 董超; 张佳强; 杨先珉
Original assignee: SICHUAN XLY INFORMATION SAFETY TECHNOLOGY Co Ltd
Current assignee: SICHUAN XLY INFORMATION SAFETY TECHNOLOGY Co Ltd
Priority date: 2016-03-15
Filing date: 2016-03-15
Publication date: 2016-08-03
Anticipated expiration: 2036-03-15
Also published as: CN105824716B

Abstract

The invention discloses a method for re-generating an LDR file, and belongs to the field of hard disk data restoration. The method comprises the following steps of S1, obtaining CFW_OVL through finding a file descriptor in a volume 0; S2, judging whether POS-74 exists in a Volume 3 or not, if so, continuing the next step, and otherwise, quitting the step; S3, using the found POS-74 contents as the reference, backwards reading continuous 0x16 times, and completing the LDR composition reading; if the discontinuous condition occurs in the midway of the read 0x16 times, directly quitting the step; using the read file as the LDR composition file to be stored. The method provided by the invention has the beneficial effects that the problems that a Seagate hard disk cannot enter the T stage and cannot access data, and the LEDOx000000XX error is prompted can be restored through the regeneration of the LDR file, so that the method provided by the invention can be used for restoring the defects of the Seagate hard disk.

Description

A kind of method regenerating LDR file

Technical field

The present invention relates to hard disc data and recover field, particularly to a kind of method regenerating LDR file.

Background technology

What is LDR file: LDR file is the microcode firmware of a kind of bottom in Seagate.It is to remain uncommon The essential condition that prompt instruction mode normally works.If there is defect in microcode, the diagnostic instruction pattern of Seagate To all lose efficacy, it is impossible to perform all operations under the diagnostic mode of Seagate.

LDR file to be generated: under Seagate diagnostic instruction pattern, it is impossible to normally enter T level time Waiting, diagnostic instruction pattern cannot normally work, it is necessary to looks for the hard disk of identical firmware version number to regenerate LDR file.

Concrete need to generate LDR the most in what situations, load LDR file: can not entry instruction T level or LEDOx000000XX mistake is pointed out under diagnostic instruction pattern.

Summary of the invention

The present invention is directed to the deficiencies in the prior art, it is provided that a kind of method regenerating LDR file, permissible Solve the problem that prior art cannot regenerate LDR file.

For solving problem above, the technical solution used in the present invention is as follows: a kind of LDR file of regenerating Method, step is as follows: S1 obtains CFW_OVL by searching the filec descriptor in volume 0；S2 judges volume Whether there is POS-74 in 3, if existing, continuing next step, otherwise exiting；S3 is with the POS-74 found On the basis of content, read continuous print backward 0x16 time, then LDR composing document reads complete；If read , there is discontinuous situation, the most directly exits in take 0x16 time midway, using the file that read as LDR Composing document preserves；The file of reading is combined by S4 successively, is loaded in hard disk cache to be restored, And be compiled thinking highly of to the hard disk to be restored having loaded LDR and build.

As preferably: S1 is specific as follows:

S11 reads the first address of No. 0 module of normal hard disk of identical firmware version number, with the head of No. 0 module Address is as the initial address reading normal hard disk RAM data；

S12 reads the Buffer content of normal hard disk RAM, value L of a length of 0x1e0800；

S13 search in L volume 0 start address, 12 byte lengths of skew backward, search continuously M group filec descriptor；

S14 continues to search for the three-bit value i.e. FID value more than 0x20A after in filec descriptor；

S15 continue to search for filec descriptor front 4 consistent, value N of rear four logic increments, then take N FID；

The length that S16 continues to search for filec descriptor is consistent, and length is less than the FID of 1024 bytes, takes The entry of first FID, is CFW_OVL.

As preferably, S2 is specific as follows:

S21 takes 4 byte content X at Buffer, carries out the value of " with computing " with 0xFE000000, if Equal to 0xFC000000, and the value reading 0x16 time continuously is the same, then carry out next step, otherwise exit；

S22X offsets 0x74 backward, takes 4 bytes, then carries out AND-operation with 0x7FF, if equal to 100, Then X offsets 0x78 backward, takes 4 bytes, then carries out AND-operation with 0x7FF, if equal to 101, then Carry out next step, otherwise exit；

S23X offsets 0x88 backward, takes 4 bytes, then carries out, with 0x7FF, the value that AND-operation obtains, If Y group is to be incremented by continuously continuously, then carries out next step, otherwise exit；

S24X offsets 0xB0 backward, takes 4 bytes, then carries out, with 0x7FF, the value that AND-operation obtains, If Z group is to be incremented by continuously continuously, then judge that X, as POS-74, otherwise exits.

Beneficial effects of the present invention is as follows: regenerates LDR file and can repair Seagate hard disk and cannot be introduced into T Level, it is impossible to accessing data, the problem of prompting LEDOx000000XX mistake, therefore the method for the present invention is permissible Repair above-mentioned Seagate Hard Disk Defect.

Detailed description of the invention

For making the purpose of the present invention, technical scheme and advantage clearer, referring to embodiment, right The present invention is described in further details.

A kind of method regenerating LDR file, step is as follows:

S1 obtains CFW_OVL by searching the filec descriptor in volume 0；S2 judges whether exist in volume 3 POS-74, if existing, continuing next step, otherwise exiting；S3 on the basis of the POS-74 content found, Read continuous print backward 0x16 time, then LDR composing document reads complete；If in 0x16 time read On the way, discontinuous situation occurs, the most directly exits, carry out as LDR composing document using the file read Preserve；The file of reading is combined by S4 successively, is loaded in hard disk cache to be restored, and to having loaded LDR Hard disk to be restored be compiled thinking highly of and build.

S1 is specific as follows:

S13 search in L volume 0 start address, 12 byte lengths of skew backward, search continuously M group filec descriptor；The wherein M position integer more than or equal to 2, it is assumed that value is 5 groups here.

S14 continues to search for the three-bit value i.e. FID value more than 0x20A after in filec descriptor；Assume here There are 0x20B, 0x20C, 0x20D, 0x20E；

S2 is specific as follows:

Claims

1. the method regenerating LDR file, it is characterised in that step is as follows: S1 is by searching volume 0 In filec descriptor obtain CFW_OVL；S2 judges whether there is POS-74 in volume 3, if existing, under continuing One step, otherwise exits；S3, on the basis of the POS-74 content found, reads continuous print 0x16 time, then backward LDR composing document reads complete；If in 0x16 the midway read, discontinuous situation occurring, the most directly moving back Go out, preserve as LDR composing document using the file read；The file of reading is combined by S4 successively, It is loaded in hard disk cache to be restored, and is compiled thinking highly of to the hard disk to be restored having loaded LDR and builds.

A kind of method regenerating LDR file the most according to claim 1, it is characterised in that S1 has Body is as follows:

S11 reads the first address of No. 0 module of normal hard disk of identical firmware version number, with the first ground of No. 0 module Location is as the initial address reading normal hard disk RAM data；

S13 search in L volume 0 start address, backward skew 12 byte lengths, search continuous print M group Filec descriptor；

S15 continue to search for filec descriptor front 4 consistent, value N of rear four logic increments, then take the FID of N；

The length that S16 continues to search for filec descriptor is consistent, and length is less than the FID of 1024 bytes, takes the The entry of one FID, is CFW_OVL.

A kind of method regenerating LDR file the most according to claim 2, it is characterised in that S2 has Body is as follows:

S21 takes 4 byte content X at Buffer, carries out the value of " with computing " with 0xFE000000, if being equal to 0xFC000000, and the value reading 0x16 time continuously is the same, then carry out next step, otherwise exit；

S22 X offsets 0x74 backward, takes 4 bytes, then carries out AND-operation with 0x7FF, if equal to 100, Then X offsets 0x78 backward, takes 4 bytes, then carries out AND-operation with 0x7FF, if equal to 101, then carrying out Next step, otherwise exit；

S23 X offsets 0x88 backward, takes 4 bytes, then carries out, with 0x7FF, the value that AND-operation obtains, if even Continuous Y group is to be incremented by continuously, then carry out next step, otherwise exit；

S24 X offsets 0xB0 backward, takes 4 bytes, then carries out, with 0x7FF, the value that AND-operation obtains, if even Continuous Z group is to be incremented by continuously, then judge that X, as POS-74, otherwise exits.