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 ?
Finally, if the dominant line of business 55-percent test is retained, then the determination should be based on all employees including union employees.
414(r)-1(b)(1), if an employer elects to treat one line of business as a qualified separate line of business, it must treat all of its lines as qualified separate lines of business.
Employees who do not perform substantial services for any one particular line of business (for example, headquarters' employees) must be allocated to lines of business under specific allocation rules.
The dominant line of business method generally is the most attractive method available to allocate residual employees (Regs.
We show that the ratio of the default value to liability value for a line of business does not change with different allocations of capital to lines of business, as implied by the allocation formula derived in Myers and Read (2001).
The payoffs to each line of business allowing for the insurer insolvency and the value of the insolvency exchange option by line of business is determined.
In a two-step process, the employer designates its lines of business by first identifying all of the services and property it provides to customers during the testing year and then determining what portion of the property and services is provided by each line of business.
12) Therefore, the same products and services could be offered by more than one line of business.
The December 1991 final regulations contained a special optional rule applicable to employees who have temporarily transferred from one line of business to another.
Employees of a line of business (the upstream line) that provides property or services to another line of business of the employer (the downstream line) generally are also considered to be providing services to the downstream line of business.
132-4(a)(1) illustrate line of business restrictions.