ISO INTERNATIONAL STANDARD 9315 First edition 1989-07-15 Information processing systems - Interface between flexible disk cartridge drives and their host controllers Systemes de traitement de I'information - Interface entre dispositifs d'entrainement pour cartouches de disques souples et leurs controleurs hotes Reference number ISO9315:1989 (E) Copyright Intemational Organization for Standardization No reprod ensewithIs Not for Resale ISO9315:1989 (E) Foreword ISO(theInternational OrganizationforStandardization)isaworldwidefederationof national standards bodies (ISO member bodies). The work of preparing International Standards isnormally carriedout throughtSOtechnical committees.Eachmember 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- mental and non-governmental, in liaison with iso, also take part in the work. ISO collaborates closelywith theInternational Electrotechnical Commission(lEC)onall mattersofelectrotechnicalstandardization. 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 % approval by the member bodies voting. International Standard iSO9315waspreparedbyTechnical CommitteeISO/TC97, Information processing systems. ? ISO 1989 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any writing from the publisher. International Organization for Standardization Case postale 56.CH-1211Geneve 20.Switzerland Printed in Switzerland CoygheainalrganizatofSandardizaio ed without license from IHS Not for Resale ISO9315:1989 (E) INTERNATIONALSTANDARD Information processing systems --- Interface between flexible disk cartridge drives and their host controllers 1 Scope 2.3 cartridge: An assembty consisting of a jacket and a disk. This International Standard specifies a flexible disk cartridge 2.4 cylinder: The track(s) available under the read/write drive and defines the necessary functional and electrical re- head at each radial head position. Each cylinder on a double- quirements (including logic signals) and the mechanical re- sided drive includes two tracks. On a single-sided drive, quirements of the interface for the connection of conforming cylinders and tracks are synonymous. flexible disk drives to a host system. It includes drives using media specified in many standards but does not exclude drives 2.5 disk: A flat circular device having a magnetic coating on usingother media. at least one side. This International Standard is distinct from a specification in that it delineates a minimum set of requirements consistent 2.6 disk drive: A mechanism consisting of a spindle to sup. withcompatibilityand interchangeabilityat the interface level. portandrotate a disk,oneormoreread/writeheadspositioned This standard is intended to facilitate the interconnection of to read or write digital information on a track of the disk, an ac- flexible disk drives to a host system by a user who has available tuator to move the heads to any track, and logic circuits and thetechnical capability to verifytest performance up through amplifying circuits as required. the functional level. The user should also have the capability of specifying the overall system hardware and software that will 2.7 format: The arrangement of coded flux patterns on a be unique for this particular device, and should also have the track of a disk to represent tolerance gaps, preamble fields, ad capability of specifying the controller combination for the desired application and end use. dress fields,data fields,sector marks,etc. This International Standard applies to both single- and double- 2.8 hard sectoring:The useof mechanical means suchas sided disk drives using 200 mm (8 in) or 130 mm (5,25 in) multiplicity of holes in the index track to define fixed angular envelope-size flexible d