7298 International Standard (ISO INTERNATIONALORGANIZATIONFORSTANDARDIZATION-MEXKAYHAPOAHAAOPTAHW3ALMRNO CTAHAAPTW3AUMMORGANISATIONINTERNATIONALEDENORMALISATION Information processing -- Magnetic disk for data storage devices - 158 000 flux transitions per track, 210 mm (8.3 in) outer diameter, 100 mm (3.9 in) inner diameter Traitement de I'information -- Disque magnetique pour unités de stockage des donnees - 158 000 transitions de flux par piste, diametre exterieur 210 mm (8,3 in), diametre intérieur 100 mm (3,9 in) First edition - 1985-05-01 UDC 681.327.63 Ref. No. 1SO 7298-1985 (E) ISO 7298-1985 (E) Descriptors:data processing, information interchange, data storage devices, magneticdisks,physicalproperties,magneticproperties, dimensions, tests. Price based on 15 pages Foreword iso (the International Organization for Standardization) is a woridwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has mental and non-governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the Iso Council. They are approved in accordance with ISo procedures requiring at least 75 % approvat by the member bodies voting. international Standard ISO 7298 was prepared by Technicat Committee ISO/TC 97, Informationprocessingsystems. InternationalOrganizationforStandardization,1985 Printed in Switzerland i Contents Page Scopeandfieldofapplication 2 Reference. General requirements 4 Dimensions 2 Physical characteristics 5 2 Testing of magnetic characteristics 4 Surfacetests Track quality tests 8 Requirements for magnetic surfaces 9 8 Defects of the magnetic surfaces 10 8 Annexes 12 A Aircleanlinessclass100 Method for measuring friction between head and disk B 13 c Measurement of the effective track width 15 ili