Background information
A few days ago, a group of Internet circles who had cooperated for many years, Zhang Zong (a pseudonym) personally asked me if I was still doing data recovery business. I said that I still do it, although the company’s key business has turned Software development and mobile forensics technology, but the hard disk data recovery business is still an important support for the company. After nearly 10 years of accumulation, the data recovery technology is more solid.
I suddenly found out that there was a problem. In the past, when there was a need for data recovery, Zhang would not personally ask. The other party will have a designated engineer directly docked with Dass engineers, or their technical manager will connect with Dass, but this time, Mr. Zhang has repeatedly confirmed 4 or 5 calls, and in the afternoon, he personally accompanied him. coming. This signal is nothing more than two, one is that the data of this hard disk is extremely important, and the owner of this hard disk is extremely important. Later, I found that the data of this hard disk and the owner of the hard disk are very important to Zhang.
When you get the hard drive, the Darth data recovery team will soon be cold. This hard drive not only has obvious traces of disassembly, but the magnetic head is also placed separately on the hard disk. This disk was not only opened but also replaced with a magnetic head. The people who are engaged in technology are very clear that this hard disk data recovery is a very difficult case. Let's take a look at the specific situation.
Case name: Hitachi HDS721025CLA382250G hard disk was replaced by the magnetic head and the second opening was successfully restored.
Customer Name: Mysterious person
Symptom: The hard disk is not recognized, and the disk is replaced by the magnetic head. Where is the opening data recovery is unknown.
Data recovery and forensics process:
1. Technical analysis: After the Darth data recovery engineer receives the hard disk, the hard disk is obviously recovered by the opening data. Since the disk has been opened, the power can not be detected again during the test. The engineer directly enters the clean room to open the hard disk for testing. After opening the disk, it was found that there were obvious scratch marks on the surface of the hard disk, as shown in Figure 1:
Figure 1: Hard disk platter is obviously scratched
We can see that the edge of the hard disk platter is already very noticeable, about 0.3 mm wide. There is a slight and very small scratch in the middle of the disk, but it can be seen by the naked eye.
In this case, the vast majority of data recovery engineers will choose to give up, but because of Zhang's relationship, and the owner of the hard disk hopes to rescue the data at all costs, we decided to let go.
2. Data recovery and forensics process;
The mooring area of ​​this hard disk head is outside the platter. After the power is turned on, the head enters the platter to read the relevant information. Then the edge of the scratch is the path that the head must pass. When the head is scratched, it is very likely. The replacement of the new head will be damaged again, and the Darth Data Recovery Engineer is very experienced in dealing with this scratching technique.
We have prepared 4 spare parts of the same model for this purpose. Open the disk in the Class 100 clean room and replace the good head. Then the most critical step is to adjust the position. As long as the position is adjusted, the scratch is generally smaller than the width of the head, so that the replaced head can enter the disk. Will not damage the newly replaced good head due to scratches on the edge, adjust the position, hang the hard disk on the Darth data recovery special machine, the hard disk can be recognized normally, everything goes well, then go to the Hitachi factory firmware specialization program and find the fan of the hard disk The area cannot be accessed. After detecting the firmware, the defect table is damaged, and the defect table is quickly repaired, and the hard disk can be read to the sector normally.
At this time, we must start the cloning work. We select the most important files of the user for extraction. The state of the hard disk should not be completely cloned. It must be cloned according to the important files of the customer. First extract the most important documents of the customer first, and then make plans. Because the disc is scratched, it is possible to read at any position where the head is scratched and the head will hang. After 5 days, the magnetic head was replaced repeatedly, the position of the magnetic head was adjusted, and the extraction was intermittently and finally, the file specified by the customer was successfully recovered.
3, data recovery results: 98% success
Technical difficulties and advice to customers:
Difficulties in this case: Since the hard disk has already been opened for data recovery, the second opening has brought difficulties, and it is just that the disk has scratch marks, and the difficulty is even more amazing. Generally encountered such a scratch, many data recovery companies will choose to give up. The Darth engineers dared to challenge the difficulty, and finally completed the difficult data recovery work with unremitting persistence.
Customer suggestion: When you find that the hard disk is abnormal, you must reduce the power on the media, and do not want to find a non-professional data recovery operation, you must find a professional data recovery company to get it. Darth data recovery, data recovery expert enterprise.
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