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Last modified: Tuesday, October 11, 2005 

(v.) (1) To prepare a storage medium, 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.

Note that reformatting a disk does not erase the data on the disk, only the address tables. Do not panic, therefore, 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.

The previous discussion, however, applies only to high-level formats, the type of formats that most users execute. In addition, hard disks have a low-level format, which sets certain properties of the disk such as the interleave factor. The low-level format also determines what type of disk controller can access the disk (e.g., RLL or MFM).

Almost all hard disks that you purchase have already had a low-level format. It is not necessary, therefore, to perform a low-level format yourself unless you want to change the interleave factor or make the disk accessible by a different type of disk controller. Performing a low-level format erases all data on the disk.

Also see "Formatting a Hard Disk Drive" in the "Did You Know...?" section of Webopedia.

(2) To specify the properties, particularly visible properties, of an object. For example, word processing applications allow you to format text, which involves specifying the font, alignment, margins, and other properties.

(n.) A specific pre-established arrangement or organization of data. Data in a file is stored in a format that is established by whatever application created the file (i.e., organized the data) and typically needs to be read by the same or similar program that can interpret the format and present the data to the user on the computer screen.

Almost everything associated with computers has a format.

Also see Data Formats and Their File Extensions in the Quick Reference section of Webopedia.

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For pages about format . Also check out the following links!

Related Links

Common Data Format (CDF) home page
CDF is a scientific data management package, from the National Space Science Data Center, which allows programmers and application developers to manage and manipulate scalar, vector, and multi-dimensional data arrays. From this page you will find links to introductory information, as well as information on obtaining this software along with related documentation.

National Center for Computing Applications HDF Information Server
Hierarchical Data Format (HDF) is a platform-independent data format for the storage and exchange of scientific data. This page provides links to HDF uses, documentation, tools, and contact information.

NetCDF format
Presents direct access to complete documentation, including FAQs, on netCDF (Network Common Data Form), a special machine-independent format used for representing scientific data.

OpenMath format homepage
Provides a description of OpenMath, a universal protocol for the exchange of mathematical data between programs. There are links to project information, reports, and workshops.

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