When the storage medium appeared the damage or personnel misoperation fault which will appeared the operating system itself is unreadable and lost that caused by data, by means of special reading engineers can read the data that cannot be read in a normal state.
Electronic data recovery is defined through technological means, which is saved in the desktop hard drive, portable hard drive, server, hard drive, storage, tape libraries, removable hard drive, Flash drive, digital memory cards, Mp3 and so on device loss technique for rescue and recovery of electronic data.
Basic principles of data storage and recovery
In reality many people do not know deleted and formatted hard disk operations such as the lost data can be restored, they think that the deleted or formatted data does not exist in the future. In fact, the data still exists on your hard disk after these simple operations, the people who knows the data recovery principles will disappear under the knowledge of only a few data back, don't freak out, understanding of data stored on media such as hard drive, USB drive, a floppy disk after the principle, you can do a magician himself. For example, a winrar file which is not usually use, we have forget its password, but it has most important thing, how should we do? The common way is to use a winrar password remover, only needs a few minutes, the winrar file will be broken.
Formatting
When storing files in our hard drives, the system will first write in the file allocation table file name, size, and according to the data area of the free space on a file allocation table that continues to write the contents of the file in the data area on the starting position. And then began to write the real content of the file on to the data area, a file operation will be completed. Delete operation is simple, when we need to delete a file, the system just in front of the file in the file allocation table writing a delete flag, indicating that the file has been deleted, the space has been occupied by his "release", and other files can use his use of space. So when we delete files and want to find him (data recovery), simply use the tool to remove the flag removed and the data is restored back. Of course, as long as there are no new files are written, the space occupied by the file is not overwritten by new content.
Delete
Formatting is similar to delete, the only action is in file allocation tables, but formatting is to include all files and remove the flag, or simply a file allocation table empty, the system assumes that any hard disk partition does not exist on the content. Format operation has not does any actions to the data area, the directory is free, with the knowledge and tools for data recovery, data can still be recovered back. However, for most of people, they do not know this knowledge, they often use a free data recovery software.
Note: the format is not a 100% being able to recover, some disks can not be opened, you need to format to open. If your data is important, never to attempt to formatting, and then want to restored, because formatting is the process of disk writes by itself, can only destroy the residual information.
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