# sector

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## sector

1. Geometry either portion of a circle included between two radii and an arc. Area: ½r2θ, where r is the radius and θ is the central angle subtended by the arc (in radians)
2. a measuring instrument consisting of two graduated arms hinged at one end
3. Computing the smallest addressable portion of the track on a magnetic tape, disk, or drum store

## Sector

(1) A sector in the plane is a region bounded by two rays issuing from an interior point of a figure and by an arc of its boundary cut off by these rays. In particular, a sector of a circle is bounded by two radii and an arc cut off by the radii. The area of a sector of a circle is equal to lr/2 or πr2α /360, where l is the length of the arc, α is the central angle (in degrees) subtended by the arc, and r is the radius of the circle.

(2) A sector in space is the part of a solid bounded by a conical surface whose vertex is in the solid and by the part of the solid’s surface cut off by the conical surface. A spherical sector is an example of a sector in space.

## sector

[′sek·tər]
(computer science)
A portion of a track on a magnetic disk or a band on a magnetic drum.
A unit of data stored in such a portion.
(civil engineering)
A clearly defined area or airspace designated for a particular purpose.
(electromagnetism)
Coverage of a radar as measured in azimuth.
(mathematics)
A portion of a circle bounded by two radii and an arc joining their end points.
(meteorology)
Something resembling the sector of a circle, as a warm sector between the warm and cold fronts of a cyclone.

## sector

The smallest unit of data that is written to and read from a storage drive. The initial hard disk sector sizes were 128 and 256 bytes long but were later increased to 512. Eventually, sectors were enlarged to the "Advanced Format" size of 4,096 bytes. See cluster, sector interleave and magnetic disk.
References in periodicals archive ?
These actions, he explained, turned mainly on boosting the capacities of the public and private stakeholders, launching several sectorial studies by 2020, 2030 and 2050 as well as an action plan by 2020.
The performance of the sectorial indices was mainly in green, with eight in green, three in red, while two remained unchanged since last closing, as real estate sector was the top loser, while the financial services sector as the top gainer.
Three sectorial programs focusing on regional development, transport and economic competitiveness remain suspended.
The EFQM Excellence Model, a management framework used by over 30 000 organizations in Europe provides a common framework and language that facilitates the effective sharing of information between organisations; transcending sectorial, cultural and maturity barriers.
7 (ONA) -- The supervisory committee on the sectorial committees for Omanization today held its first meeting of the year at the Ministry of Manpower HQs' under the chair of Sheikh Abdullah bin Nasser al-Bakri, Minister of Manpower.
Additionally, each sector (Financial Sector, Services Sector, and Industry Sector) will include sub-sectors and the three sectorial indices will include 15 companies instead of 10 to enhance the coverage.
Replying to a question, Richard Holbrooke said they revitalized the Strategic Dialogue and reviewed the progress so far made in the sectorial meetings necessary to expand bilateral cooperation in various sectors.
Director for economy and the secretary of provincial development committee engineer Abdul Wali stated said this while addressing a meeting organized by sectorial departments of the province in governor house.
a The measures taken by Morocco and the EU on the occasion of the 7th meeting of the association council, provides for preparing a deeper anda more comprehensive trade agreement, the gradual integration of Morocco in the EU several sectorial policies, and the promotion of human exchanges, ABCC underlined in its latest newsletter.
As well as providing sectorial analysis, the Wales Top 300 magazine will include commissioned articles from key political and business figures, including telecommunications billionaire Sir Terry Matthews.
Fiat has fashioned a "patchwork" strategy of sectorial alliances in components, robotics and agricultural machinery that have made it market leader or heavyweight in each category.
65 GHz for WiMAX Applications with a Large Selection of Directional, Sectorial and Omni-Directional Antennas

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