7297-85 4851903 0054360 5 -54-35 7297 nternational Standard Information processing - Magnetic disk for data storage devices - 96 000 flux transitions per track, 200 mm (7.9 in) outer diameter, 63,5 mm (2.5 in) inner diameter Traitement de I'information - Disque magnetique pour uniteés de stockage des données - 96 000 transitions de flux par piste, diametre exterieur 200 mm (7,9 in), diametre interieur 63,5 mm (2,5 in) First edition - 1985-03-15 UDC 681.327.63 Ref. No. ISO 7297-1985 (E) 7297-1985 Descriptors : data processing, information interchange, data storage devices, magnetic disks, , physical properties, magnetic properties, dimensions, tests. OS Price based on 15 pages ight International OrganizationforStandardization Not for Resale T9Eh500 8 7297-85 4851903 Foreword IsO (the International Organization for Standardization)is a worldwidefederation 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 the right to be represented on that committee. International organizations, govern- mentalandnon-governmental,inliaisonwithisO,alsotakepartinthework. Draft International Standards adopted bythetechnical committeesare 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 % approvai by the member bodies voting. International Standard iSO 7297 was prepared by Technical Committee ISO/TC 97, Informationprocessingsystems. International Organization for Standardization,1985 . Printed inSwitzerland Not for Resale 7297-85 4851903 0054362 4 Contents Page Scope and field of application 1 Reference General requirements Dimensions 2 Physical characteristics 2 Testing of magnetic characteristics 4 Surface tests Track quality tests 8 Requirements for magnetic surfaces 8 9 10 Defects of the magnetic surfaces . Annexes A Air cleanliness class 100 12 Method for measuring friction between head and disk ......... B 13 C Measurement of the effective track width 15 Copyright International Organization for Standardization No reproduction or networking permitted without license from IHS Not for Resale.