ANSI INCITS 120-1984 Information Systems - Contact Start-Stop Storage Disk - 95 840 Flux Transitions per Track 7.874-in (200-mm) Outer Diameter and 2.500-in (63 5-mm) Inner Diamete.pdf

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1、ANSI INCITS 120-1984 (R2002)(formerly ANSI X3.120-1984 (R2001)for information systems contact start-stop storage disk 95 840 flux transitions per track7.874-in (2OO-mm) outer diameter and2.500-in (63,5-mm) inner diameterANSI X3.120-1984 American National Standard for Information Systems - Contact St

2、art-Stop Storage Disk - 95 840 Flux Transitions per Track 7.874-in (200-mm) Outer Diameter and 2.500-in (63,5-mm) Inner Diameter Secretariat Computer and Business Equipment Manufacturers Association Approved June 12, 1984 American National Standards Institute, I nc AmericanNationalStandardApproval o

3、f an American National Standard requires review by ANSI that therequirements for due process, consensus, and other criteria for approval havebeen met by the standards developer.Consensus is established when, in the judgment of the ANSI Board of StandardsReview, substantial agreement has been reached

4、 by directly and materiallyaffected interests. Substantial agreement means much more than a simplemajority, but not necessarily unanimity. Consensus requires that all views andobjections be considered, and that a concerted effort be made toward theirresolution.The use of American National Standards

5、is completely voluntary; their existencedoes not in any respect preclude anyone, whether he has approved the standardsor not, from manufacturing, marketing, purchasing, or using products, processes,or procedures not conforming to the standards.The American National Standards Institute does not devel

6、op standards and will inno circumstances give an interpretation of any American National Standard.Moreover, no person shall have the right or authority to issue an interpretation ofan American National Standard in the name of the American National StandardsInstitute. Requests for interpretations sho

7、uld be addressed to the secretariat orsponsor whose name appears on the title page of this standard.CAUTION NOTICE: This American National Standard may be revised orwithdrawn at any time. The procedures of the American National StandardsInstitute require that action be taken periodically to reaffirm

8、, revise, or withdrawthis standard. Purchasers of American National Standards may receive currentinformation on all standards by calling or writing the American National StandardsInstitute.Published byAmerican National Standards Institute11 West 42nd Street, New York, New York 10036Copyright 1984 by

9、 Information Technology Industry Council (ITI)All rights reserved.No part of this publication may be reproduced in anyform, in an electronic retrieval system or otherwise,without prior written permission of ITI, 1250 Eye Street NW,Washington, DC 20005.Printed in the United States of AmericaForeword

10、(This Foreword is not part of American National Standard X3.120-1984.) This standard presents the general, physical, and magnetic requirements for achieving unrecorded media interchange between compatible rigid disk storage applications, using either fixed or removable media. Subsequent standards ma

11、y specify other disks with different storage and performance capabilities, or additional requirements for this media, relevant to higher levels of inter- change in a specific application. Due to the variety of possible applications of the stan- dardized media, whether used singly or in multiple-fixe

12、d disk machines, or in removable disk cartridges and packs, there has been no attempt to define data format or data inter- change requirements at the single disk level. Technical Committee X3B7 on Magnetic Disks, which developed this standard, consists of a group of experienced and qualified special

13、ists on rigid disk media and the associated disk storage drives. In the development of this standard, careful consideration was given to current practices, existing equipment, and applicable standards being developed inter- nally. This standard was approved as an American National Standard by the Am

14、erican National Standards Institute on June 12,1984. Suggestions for improvement of this standard will be welcome. They should be sent to the Computer and Business Equipment Manufacturers Association, 3 11 First Street, NW, Suite 500, Washington, DC 20001. This standard was processed and approved fo

15、r submittal to ANSI by American National Standards Committee on Information Processing Systems, X3. Committee approval of the standard does not necessarily imply that all committee members voted for its ap- proval. At the time it approved this standard, the X3 Committee had the following members. Ed

16、ward Lohse, Chair William C. Rinehuls, Vice-Chair Catherine A. Kachurik, Administrative Secretary Organization Represented Name of Representative American Library Association. . . . . . . . . . . . . . . . . . . . . . . . . . . . Paul Peters American Nuclear Society . . . . . . . . . . . . . . . . .

17、 . . . . . . . . . . _ . . Geraldine C. Main D. R. Vondy (Ah) AMP Incorporated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Patrick E. Lannan Edward Kelly (AR) AMTELCO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stephen Soto Association of Amer

18、ican Railroads. . . . . . . . . . . . . . . . . . . . . . . . . R. A. Petrash Association for Computing Machinery. . . . . . . . . . . . . . . . . . . . . . . J. A. N. Lee Pat Skelly (AR) Association of the Institute for Certification of Computer Professionals. . . . . . . . . . . . . . . . . . . .

19、. . . . . . . . . Thomas M. Kurihara Ardyn E. Dubnow (AR) AT&T Company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Henry L. Marchese Paul W. Campbell (AR) Stuart M. Garland (Ah) AT&T Information Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Herbert V. Ber

20、tine Paul D. Bartoli (Ah) Burroughs Corporation. . . . . . . . . . . . . . . . . . . . . . . . . . . . _ . . . Ira R. Purchis Ernest L. Dixon (Ah) Control Data Corporation _ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Charles E. Cooper Keith Lucke (Ah) Cooperating Users of Burroughs Eq

21、uipment. . . . . . . . . . . . . . . . . . . . Thomas Easterday Thomas Grier (Ah) Data General Corporation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . John Pilat Howell A. Richards (AR) Data Processing Management Association . . . . . . . . . . . . . . . . . . . . . Ardyn E. Dubnow L

22、ou Mills (Ah) _ ._.-.-. . .L._-_.L- -“, .a ., _ ._. : - - Organization Represented Digital Equipment Computer Users Society Digital Equipment Corporation. Exxon Office Systems General Electric Company General Services Administration GUIDE International. Harris Corporation Hewlett-Packard. . Honeywel

23、l Information Systems IBM Corporation . IEEE Lawrence Berkeley Laboratory . Life Office Management Association. . Moore Business Forms, Inc . National Bureau of Standards. . National Communications System . NCR Corporation. Perkin-Elmer. . Prime Computer. . Recognition Technology Users Association S

24、HARE,Inc Sperry Corporation. . Texas Instruments, Inc. . 3MCompany . Travelers Insurance Companies, Inc. U.S. Department of Defense. VIM . Wang Laboratories, Inc. . Xerox Corporation Name of Representative James Hodges Paula Morin (Alt) Lois C. Frampton Gary S. Robinson (AR) Robert Greenblatt Hugh D

25、. Thuerk William C. Rinehuls Donald J. Page (AR) Frank Kirshenbaum Thomas F. OLeary, Jr (AH) Sam Mathan Rajiv Sinha (AR) Donald C. Loughry Thomas J. McNamara David M. Taylor (AR) Mary Anne Gray Robert H. Follett (AR) Sava Sherr Robert Poston (AR) Thomas A. Varetoni (AR) David F. Stevens John S. Colo

26、nias (AR) James J. Merrick James F. Foley, Jr (AR) Delmer H. Oddy Robert E. Rountree James H. Burrows (Ah) Marshall L. Cam George W. White (Alt) Thomas W. Kern A. R. Daniels (Alt) James Pisarcik Russ Lombard0 (AR) Melvin L. Cassio Herbert F. Schantz G. W. Wetzel (AR) Thomas B. Steel Daniel Schuster

27、(AR) Marvin W. Bass Charles D. Card (AR) Presley Smith Richard F. TIOW, Jr (Alt) R. C. Smith Joseph T. Brophy William LaPlant Belkis Leong-Hong (AR) Chris Tanner Joe Fitzgerald (AR) Marsha Hayek John L. Wheeler Arthur R. Machell (AR) Technical Committee X3B7 on Magnetic Disks, which developed this s

28、tandard, had the following members: William Carlson, Chair Paul D. Jahnke, Vice-Chair Tony Saratora, Secretary David C. Abbe J. L. Amstutz George Andel Gil Argentina Wolfgang Arnold Wendell Bale Dave Barnes James L. Barnes Peter Berkenkotter Warren Bilich Shahbuddin Billawala G. 0. Blanchard Mike Bo

29、lt Jerry Bonzo Jim Boothe William L. Bramlett, Jr Don Bruck Otto Butsch David E. Butz Norm Chandler Robert Charlton Jim Colley Frank Conaty Bert Cook Dennis Cook Jack Corey Thomas Craig John Cusimano John Dahl David Danson Ken Davies M. Deese John Dehnar Ron Dennison Robert Dubin R. Elliott Soji End

30、o Bill Erdman George Fencl TomFerrara Ian Fleming Rex Fuller Allghiero Galvagni Arpad Garamy Marv Garrison Bob Gaskln Robert Gaskins John Gauke Stan Geyer Paul N. Green Mark Heerema Terry Henning Dennis Hickman Mike Hiss Carl Holder Frank G. Huggins Bill Johnson Don Johnson Phillip Johnson Emile Ker

31、ba Curt Kissinger Norman Klivans Gerald Korth Cris Krishnan Ron Kubec Dick Laat Barbara Langland Charles Lawrence John Lee Ken Liebler Mark Lienau Victor Longa Frank Lum Rich Lutke Frank Lutz Tom Mack Hector MacKay Steve Mancey John Mandle Don Mann John Mansueto Don Mattson Gary Mattson Ed McDonald

32、Patrick McGinnis Tim R. McGuire Marcus Meier Frank Meijers Chuck Meimberg Mark Meyer L. Michelson Chet Mielcarz Dick Milroy John Miyata Jim Money James Moore Joe Moravek Wayne Morris Tim Morrison Bob Mortensen William Mosher Ronald Moskowitz Charles Mpagazehe Heifa Mukhtar R. Nabozny Carmen Nargl Al

33、 Nicholson Dan Norman Bob Numbers Francis Odell Jan Olsen Robert ORear A. Ortiz Bob Owen Shyam Parikh Pravin Pate1 Bruce Payette John Perample Anthony L. Perllck Roger Peterson Jerry Phipps Billy G. Rager Vernon Riedlin Bob Rizos Don Rolph Robert Rottmayer Frank Ruble Mel Sackter Larry Santucci Anth

34、ony Saratora Jack Sartin Minoru Sasaki John Sasser Dan Sayre Jerome Schaufeld Ewald Schelert Gus Schmid Wii D. Schrupp Gary Shawhan Mike Shebanow Wallv Shimez Edgar Shinn- Dean Shoemaker Lief Skarr Rick Slocum Jim Smith Hal Sowle A. Spencer Dennis Stark Robert Stetson John Stocker Steve Stone Roger

35、Stromsta Ed Sutter David Sutton Larry Sutton Chuck Sydoryk Takeo Tabuchi Dan Tanner Thomas Tuchscherer Chenshi J. Tung Erich Valstyn John VanValkenburgh Nal Viswanathan Gwen Wade Joshua Waldman Joel Weiss Ron Weiss David M. White Chelman Wang Jack Yagl - Minor Yamada Richard F. Young C. Zachman Cont

36、ents SECTION PAGE l.Scope 9 2. General Requirements . 9 2.1 Operation and Storage Environment 9 2.2 Test Conditions. . 9 2.3 Material. 9 2.4 Coefficient of Thermal Expansion .I0 3. Dimensions lO 3.1 General.lO 3.2 Inner Diameter. .lO 3.3 Outer Diameter. .I0 3.4 Concentricity. 10 3.5 Thickness. .I0 3

37、.6 Edge Condition. .10 3.7 Clamping Area . .lO 3.8 Location of Flyable Magnetic Surfaces 10 4. Physical Characteristics. 10 4.1 Moment of Inertia. . 10 4.2 Maximum Speed .10 4.3 Runout.lO 4.4 Surface Roughness. .I2 4.5 Durability of Magnetic Surfaces .12 4.6 Lubrication of Magnetic Surfaces . .12 4.

38、7 Head/Disk Friction .12 4.8 Head/Disk Stiction .13 4.9 Cleaning of the Magnetic Surfaces. .13 4.10 Discharge Path . .13 5. Testing of Magnetic Characteristics . 13 5.1 Test Conditions. .13 5.2 Track and Recording Information. .13 5.3 Standard Reference Surface. .13 5.4 Test Head .13 5.5 Conditions

39、for Test Head Measurements . 15 5.6 Read Channel. . .15 5.7 Automatic Gain Controlled Amplifier . 15 5.8 Track Average Amplitude .15 5.9 Test Signals . .15 5.10 DC Erasure. . .15 6. Surface Tests .15 6.1 Amplitude Test. .15 6.2 Resolution Test. .15 6.3 Overwrite Test . .17 6.4 Residual Noise Test .1

40、7 7. Track Quality Test. .17 7.1 Positive Modulation Test. .17 7.2 Negative Modulation Test .17 7.3 Missing Pulse Test . .17 7.4 Extra Pulse Test . .17 8. Acceptance Criteria for Magnetic Surfaces . .18 8.1 Surface Test Criteria . .18 8.2 Track Quality (Modulation) Criteria . .18 SECTION PAGE 9. Def

41、ects of the Magnetic Surfaces . .18 9.1 Single Defect .I8 9.2 Defect Criteria . .18 Table 1 Write and DC-Erase Current. .14 Figures Figure 1 Reference Hub. . 11 Figure 2 Disk Dimensions. 11 Figure 3 Edge Conditions. . .I1 Figure 4 Write Current Waveform .14 Figure 5 AGC Amplifier Characteristics .16

42、 Figure 6 AGC Response Characteristics. .I6 Figure 7 Track Average Amplitude, 2F. .16 Figure 8 Modulation Tests . .I7 Appendixes Appendix A Class 100 Air Cleanliness. . . . . . . . . . . . . . _ . . . . Figure Al Relationship of Particle Size to Amount of Particles . . Appendix B Measurement of the

43、Effective Track Width. . . . . . . Figure Bl Effective Track Width . . . . . . . . . . _ . . . . . . . . . . . Appendix C Recommended Procedure for Measuring Frictional Coefficient between Head and Disk. . . . . . . . . . . . Figures Figure Cl Friction Test Setup. . . . . , . . . . . . . . . . . . .

44、 . . Figure C2 Experimental Result with Unlubricated Disk . . . . . Figure C3 Experimental Result with Properly Lubricated Disk Figure C4 Experimental Result with Over or Uneven Lubrication of Disk. . . . . . . . . . . . . . . . . . . . . . Figure C5 Experimental Result with Stiction on Disk . . . .

45、 . . . .I8 . . .18 . . . 20 . . . 20 . . . . . . . . . . . . . . . 24 . . . . . . . . 24 . . . 21 . . . 22 . . . 23 . . . 23 American National Standard for Information Systems - Contact Start-Stop Storage Disk - 95 840 Flux Transitions per Track 7.874-in (200-mm) Outer Diameter and 2.500-in (63,5-mm

46、) Inner Diameter 1. Scope 1 .l This standard provides the mechanical, physical, and magnetic properties of a magnetic disk with a 7.874-in (200-mm) diameter and low surface friction intended for mounting in data storage devices. A typi- cal recording density is 480 tpi with 6858 flux transi- tions p

47、er inch (ftpi) at a radius of 2.224 in (56,49 mm). 1.2 This standard defines the requirements and sup- porting test methods necessary to ensure acceptable performance levels in the context of the general appli- cation referenced above. It is distinct from a specifica- tion in that it delineates a mi

48、nimum of restrictions consistent with compatibility of media characteristics. 1.3 The performance levels contained in this standard represent the minimum acceptable levels of perfor- mance for typical applications. They, therefore, repre- sent the performance levels that the media should meet or sur

49、pass during their useful life. The performance levels in this standard are intended as guidelines to prospective users and should not be employed as sub- stitutes for purchase specifications. 1.4 Quantitative performance levels that must be met or exceeded in order to comply with this standard are given wherever 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 interacting parties, standard test methods and measurement procedures shall be used to determine s