Customer Name: Beijing Huaboxin International Consulting Co., Ltd.
Media Information: Hard Disk Hardware Operating Environment: HDP725050GLA360 Computer System: Windows xp File System: NTFS
Fault description: The customer description does not recognize the hard disk on the computer, the resource manager shows that it is unreadable, and the customer restarts the computer twice or not.
Data recovery process:
According to the phenomenon described by the customer, the hard disk is unrecognizable. After detecting, the hard disk is identifiable. There is no hardware problem. It is hanged on the data recovery special machine. Although it can identify the hard disk, it shows that it cannot be read and cannot see the normal partition. Careful observation that the disk is not the basic disk used by us, but the dynamic disk that is converted into, so the user certainly cannot recognize the partition.
Engineers use WINHEX to analyze from the bottom layer, only one 466G large partition in the partition information, rewrite the partition format to NTFS, save and exit, unmount the hard disk, re-power, a large partition can be seen directly. But at this time, there is a new problem. It is only about 10G of data in the large partition. It is far from the 100G data provided by the customer. It is preliminarily judged that there should be other partitions in the large partition. Scanning the lost partition with two data recovery software, no other partitions were found.
The engineer had to perform manual positioning search. According to the size and position of the first partition, he jumped to the approximate location to search for relevant important parameters, and successfully found the starting position and size of the second partition. According to the calculation, the disk was calculated. There are two partitions, the parameters are filled back into the MBR sector, and the data is completely recovered.
Data recovery result: data recovery succeeded
Summary of this case:
One problem in this case is that there is only one large partition in the original partition information, and the capacity is almost the size of the entire disk. How is the second partition lost in the past? Why is it converted to the basic disk? This will cause data loss. After reading the relevant information, it is found that the original basic disk can be converted into a dynamic disk to achieve lossless data, and all the volumes must be deleted before the dynamic disk is converted into a basic disk, otherwise it cannot be converted, which means that the data will be lost. According to past experience, like my previous operation to directly change the fifth byte of the partition table entry from the bottom of the data to convert the dynamic disk into a basic disk, the theory should also be lossless data, but in this case it is missing. A partition, it can be seen that sometimes experience is also risky, must be considered in many ways, carefully analyze each situation encountered.
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