Hard disk partition loss is not recognized, file system is corrupted, can not read the first /second NTF

Hard disk partition is lost or the file system is damaged, run chkdsk check prompt can not read the first /second NTFS boot fan Area. Recently resized the partition, win7 has its own disk management tool, but there is a defect that the resize disk must be adjacent to the free disk used for allocation, and the Acronis Disk Director tool number received on the network is said to be lossless resettable. Disk size, I first split 10G from the F disk, allocate 10G to the E disk, ADD is English is not complicated to operate, after doing these click cmmit, ADD requires to restart the computer and then enter the dos interface to start resize disk size, I also Going to sleep, careless, careless. Wake up and found that the E disk has indeed increased by 10G, but the E disk has become a different drive letter, need to be formatted to open, run CHkDSK E: /r prompts can not read the NTFS boot sector of the E drive, I go ! Inside the E disk is all the information I have for these years. True C, D, F disk can be bad for each disk, but this disk can not be bad, I think it may be that when I go to sleep, the system's power management detects that there is no mouse and keyboard operation to help me turn off the hard disk sleep, sweat . The subconscious has already begun to figure out how much it will cost to recover from the data recovery company. In fact, it is not priceless data, it is code/documentation/software, but I am not willing to do so. I will start to find relevant solutions on the Internet. Finally, I actually recovered the data back (all E disk data!!!) So I wrote down the entire recovery process. If a friend has this problem in the future, I might as well refer to it. I. Don't panic, keep calm (this text quotes a netizen, I strongly agree) Many friends find themselves flustered after losing data, and overwhelmingly find recovery software on the Internet to recover (some recovery software in the recovery process) Will write data to the disk), and even some to format the hard disk, this will make the possibility of data recovery back to almost zero. Therefore, I suggest that after discovering the loss of data in your hard disk, the most important thing is to keep calm, not to go to the hospital for medical treatment, and never write data to the hard disk, and you can't format it. 2. Identify the cause of data loss Before data recovery, figure out the cause of data loss, so that the right medicine can be prescribed. There are usually two cases: partition loss and data deletion (mis-formatting). Partition loss: Partition loss means that only one C drive can be seen in "My Computer", you can't see other discs. In my case, you can see the E drive, but the prompts that cannot be opened need to be formatted. The usual cause of partition loss is that the reinstallation system causes the partition table to be lost. Or, like me, when the resize disk size is cut off, the system sleeps and the hard disk stops running. Data deletion (mis-formatting): This is an error operation to delete important data or format the hard disk, resulting in data loss. 3. How does the operating system delete files? In fact, when the operating system deletes a file, it simply puts the deleted file with the “delete flag” and marks the disk space occupied by the file data as “Idle”. The file data has not been cleared, and it is still quietly "lying" on the disk. As long as the file is deleted and no new files are created, the operating system does not write new data. The deleted file data will not be destroyed, and there is a chance to use a certain technical means to "save" them. The formatting operation does not take into account the original data content on the disk, nor does it delete the old file first. Different file system types, the specific operation content of formatting is also different. For FAT32, FAT16, FAT12 and other file systems, the file allocation table (FAT, fixed at the beginning of the partition, containing the location information of the file data) and the root directory are cleared during formatting. File data is generally not cleared. For the NTFS file system, there is no fixed location requirement for newly written data during formatting, but the write position does not change under normal formatting every time. Therefore, most of the old file data will not be overwritten, and there is still a lot of residual information for us to find the missing files. Here we also remind us that if you don't know someone who wants to borrow your computer or on a USB flash drive, use diskgenius or other third parties. The deep deletion of the software ensures that it cannot be recovered. With DG, I can easily restore the 2011 VassistX program in my U disk (remember the jailbreak, the hard disk that was thrown into the river), as long as the computer-based person can easily recover the data. Sweat again. . . 4. What is the disk cylinder (this word will be repeated in the following article): The most basic component of the hard disk is a magnetic medium-coated disk made of hard metal material. The number of disks of different capacity hard disks is not Wait. Each disc has two sides and can record information. The disc is divided into a number of sector-shaped areas, each of which is called a sector, and each sector can store 128× 2 N-th power (N = 0.1.2.3) bytes of information. In DOS, each sector is 128× 2^2=512 bytes. The disc surface is centered on the disc center, and concentric circles of different radii are called tracks. A hard disk usually consists of an overlapping set of disks, each of which is divided into a number of equal tracks, and numbered from the outer edge of the "number", the tracks with the same number form a cylinder, called the column of the disk. surface. The number of cylinders on a disk is equal to the number of tracks on a disk. Since each disk has its own head, the number of disks is equal to the total number of heads. The so-called CHS of the hard disk, namely Cylinder, Head, Sector, as long as you know the number of CHS of the hard disk, you can determine the capacity of the hard disk, the capacity of the hard disk = the number of cylinders * the number of heads * Number of sectors *512B