Data recovery is the process of salvaging data from damaged, failed, corrupted, or inaccessible secondary storage media when it cannot be accessed normally.
A hard disk drive (HDD; also hard drive, hard disk, or disk drive) is a device for storing and retrieving digital information, primarily computer data. It consists of one or more rigid (hence “hard”) rapidly rotating discs (often referred to as platters), coated with magnetic material and with magnetic heads arranged to write data to the surfaces and read it from them.
Disk formatting is the process of preparing a hard disk drive or flexible disk medium for data storage. In some cases, the formatting operation may also create one or more new file systems. The formatting process that performs basic medium preparation is often referred to as “low-level formatting.” The term “high level formatting” most often refers to the process of generating a new file system. In certain operation systems (e.g., Microsoft Windows), the two processes[clarification needed] are combined and the term “format” is understood to mean an operation in which a new disk medium is fully prepared to store files. Illustrated to the right are the prompts and diagnostics printed by MS-DOS’s FORMAT.COM utility as a hard drive is being formatted.
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Prepare a storage medium device, usually a disk, for reading and writing. When you format a disk, the operating system erases all bookkeeping information on the disk, tests the disk to make sure all sectors are reliable, marks bad sectors (that is, those that are scratched), and creates internal address tables that it later uses to locate information. You must format a disk before you can use it.
Reformatting a disk does not erase the data on the disk, only the data on the address tables. Do not be panic, however, if you accidentally reformat a disk that has useful data. A computer specialist should be able to recover most, if not all of the information on the disk. You can also buy programs that enable you to recover a disk yourself.
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