# 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.
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VENTURA - Backed by the thriving industrial sector, Ventura County's commercial real estate market is showing no signs of deviating from the prosperous path set during the first quarter of 2000, experts said Friday.
The industrial sector today is intensely involved with programs to improve the quality of its products and/or services.
With the exception of Sudbury, all major Northern Ontario centres are reporting reduced construction levels in the industrial sector.
By industrial sector, ecu 34 billion was spent on manufacturing, ecu 25 billion on railways and transport, ecu 13 billion on coal, and ecu 10 billion on agriculture and fisheries.
The first part reviews the recent performance of the industrial sector in light of the new data.

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