ANSI INCITS 112

Abstract

This standard provides the mechanical, physical, and magnetic properties of a magnetic disk with a 14-inch (356-mm) diameter and low surface friction intended for mounting in data storage devices operating at 160 000 flux transitions per track and at typical track density of 480 tracks per inch (tpi). This standard defines the requirements and supporting test methods necessary to ensure acceptable performance levels. It is distinct from a specification in that it delineates a minimum of restrictions consistent with compatibility of media characteristics. The performance levels contained in this standard represent the minimum acceptable levels of performance of typical applications. They therefore represent the performance levels that the media should meet or surpass during their useful life. The performance levels in this standard are intended as guidelines to prospective users and should not be employed as substitutes for purchase specifications Quantitative performance levels that must be met or exceeded in order to comply with this standard are given whenever possible. In all cases, including those in which quantitative limits for requirements falling within the scope of this standard are not stated but are left to agreement between interchange parties, standard test methods and measurement procedures shall be used to determine such quantities. U.S. engineering units were the original dimensions in this standard. Conversions of toleranced dimensions from customary U.S. engineering units (similar to British Imperial Units) to SI units have been done in this standard according to American National Standard Metric Practice, ANSI 2210.1-1976 (and IS0 370) Method A, except as noted. Method A has been used for economy unless a requirement for absolute assurance of a fit justified use of Method B. In the national standards of IS0 member nations, additional rounding has been done to produce “preferred” values. These values should lie within or close to the original tolerance ranges. NOTE: For current conversions of toleranced dimensions, use Method A or Method B (as appropriate) as described in American National Standard Metric Practice, ANSI/IEEE 268-1982, which has superseded ANSI 2210.1-1976.