# sector

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Related to sectors: Market sectors, Economic sectors

## 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 sectors will have hospitals, schools, colleges, graveyards, grounds and public parks.
level, compared with an average of 53 percent across all the sectors we studied there.
Q: Do the private sector and government need to work more closely together?
This represents an increase in giving to the health sector of 8.
Although unpaid overtime is prevalent in the non-profit sector, it is not unique in this, in that "considerable shares of managers and professionals across the labour force work unpaid overtime.
The service sector plan - which was also implemented last month in the San Gabriel Valley and will spread to the rest of the MTA's operations countywide by year's end - was designed by MTA Chief Executive Officer Roger Snoble to answer concerns raised in recent years by political and community leaders that the transportation agency was not responsive to local needs.
33) The state provides the opportunities for entrepreneurs by allowing entry into previously closed fields of activity, and by legislating for monopoly or oligopoly business conditions in many sectors of the economy.
This article presents a summary of the high points of the first federally funded analysis of nationwide data on the structure, growth, and performance of rehabilitation in the private sector and is based on a 30-month study completed in 1987 by Berkeley Planning Associates and Harold Russell Associates.
The growth of debt in the nonfinancial business sector has left the lowest income-to-interest-expense cover since the 1930s.
Admitting that residential construction is the most active sector, Fransen said that this was particularly noticeable in 1989.
Low long-term interest rates in the three largest economies in spite of ever increasing budget deficits and higher oil prices are a stern reminder that the corporate sectors of those economies have not regained full health.

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