DATA RECOVERY BOOK

Data recovery means retrieving lost, deleted, unusable or inaccessible data that lost for various reasons.The core of information age is the information technology, while the core of the information technology consists in the information process and storage. Along with the rapid development of the information and the popularization of the personal computer, people find information more and more useful and need it ever more than the past.Connotation of data is comprehensive, it includes not only multi-media files such as data,documents, images, voices that stored in file system or data base, but also hardware information,network addresses and network services, which are used to deposit and manage those information.

Actually, there are various reasons that cause data loss; software, hardware, factitious, natural,
intended, unintended, all may cause data loss or damage on storage devices. Generally, There are two main reasons for data problem: software and hardware whose corresponding reasons are software reason and hardware reason.

Data security and fault freedom of storage are paid more and more attention. People are attaching more and more importance to developing new technologies to protect data.
The hard disk drive has short and fascinating history. In 24 years it evolved from a monstrosity
with fifty two-foot diameter disks holding five MBytes (5,000,000 bytes) of data to today's drives
measuring 3 /12 inches wide and an inch high (and smaller) holding 400 GBytes (400,000,000,000 bytes/characters). Here, then, is the short history of this marvelous device.

Before restoring data, hard disk usually needs low-level format, partition, high-level format to be used. The function is establishing certain data logical structure on physical hard disk. Usually hard disk is divided into 5 regions: MBR, DBR, DIR, FAT and DATA (Here we do not introduce FAT and NTFS file system), which altogether store and manage data. On condition that there is no problem with hardware, the first step is MBR recovery. MBR recovery is simple because it is system data. Though it may be created by different software and the code might be different, the method is the same. Even if multi-system boot, it is not hard. You can backup the data to be recovered after the system boot turn to be normal, and then restore the multi system boot.