《ANSI-INCITS-125-1985-R2006.pdf》由会员分享，可在线阅读，更多相关《ANSI-INCITS-125-1985-R2006.pdf（18页珍藏版）》请在三一文库上搜索。
1、 ANSI INCITS 125-1985 (R2001) (formerly ANSI X3. 125-1985 (R2001) for Information Systems Two-Sided, Double-Density, Unformatted, 5.25inch (130-mm), 48-tpi (1,9-tpmm), Flexible Disk Cartridge for 7958 bpr Use General, Physical, and Magnetic Requirements Copyright American National Standards Institut
2、e Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 23:50:15 MDTNo reproduction or networking permitted without license from IHS -,-,- American National Standard Approval of an American National Standard requires review by ANSI t
3、hat the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Subst
4、antial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. The use of American National Standards is completely voluntary; their existence does no
5、t in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances gi
6、ve an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or s
7、ponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard.
8、 Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Published by American National Standards Institute 11 West 42nd Street, New York, New York 10036 Copyright 1985 by Information Technology Indus
9、try Council (ITI) All rights reserved. No part of this publication may be reproduced in any form, 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 America Copyright American National Sta
10、ndards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 23:50:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ANSI X3.125-1985 American National Standard for Information Systems - Two-Sided
11、, Double-Density, Unformatted, 5.25Inch (130-mm), 48-tpi (1,9-tpmm), Flexible Disk Cartridge for 7958 bpr Use - General, Physical, and Magnetic Requirements Secretariat Computer and Business Equipment Manufacturers Association Approved November 2, 1994 American National Standards Institute, I nc Cop
12、yright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 23:50:15 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword (This Foreword is not part of American Nat
13、ional Standard X3.125-1985.) This standard presents, for the purpose of physical and magnetic interchange, a two-sided, double-density, unformatted, 5.25-inch (130-mm), 48-tpi (1,9-tpmm), flexible disk cartridge (for 7958 bits-per-radian (bpr) use). Disk parameters are defined as required to achieve
14、 interchangeability between flexible disks, storage drives, and associated informa- tion processing systems. Subsequent related standards may contain specifications that differ from this standard as a result of the normal evolution of the product. Original source dimensions for this standard were in
15、 U.S. customary units, and reconversion from metric equivalents back to U.S. customary units should not be performed. This standard was developed by the X3B8 Technical Committee on Flexible Disks, which consists of a group of experienced and knowledgeable persons uniquely qualified with respect to t
16、he flexible disk cartridge and its performance requirements. Although most members are affiliated with industry or government organizations, this standard repre- sents the sum of individual efforts. Suggestions for improvement of this standard will be welcome. They should be sent to the Computer and
17、 Business Equipment Manufacturers Association, 3 11 First Street, NW, Washington, DC 20001. This standard was processed and approved for submittal to ANSI by American National Standards Committee on Information Processing Systems, X3. Committee approval of the standard does not necessarily imply tha
18、t all members voted for its approval. At the time it approved this standard, the X3 committee had the following members: Edward Lohse, Chair William C. Rinehuls, Vice-Chair Catherine A. Kachurik, Administrative Secretary Organization Represented American Library Association. American Nuclear Society
19、. AMP Incorporated . AMTELCO Association of American Railroads. . Association for Computing Machinery Association of the Institute for Certification of Computer Professionals . AT Version B uses 10 sector holes in addition to the index hole; and Version C uses 16 sector holes in addition to the inde
20、x hole. These configurations are further de- scribed in 5.1.3.3 and Figure 2. The existence and number of sector holes shall be specified by the user. 1.2 Purpose. This standard defines the requirements and supporting test methods necessary to ensure inter- change at acceptable performance levels. I
21、t is distinct from a specification in that it delineates a minimum of restrictions consistent with compatibility in inter- change transactions. 1.3 Application. The performance levels contained in this standard represent the acceptable levels of perfor- mance for interchange purposes. They therefore
22、 repre- sent the performance levels that the interchange items should meet or surpass during their useful life. The per- formance levels in this standard are not intended to be employed as substitutes for purchase specifications. Wherever feasible, quantitative performance levels that must be met or
23、 exceeded in order to comply with this standard are given. In all cases including those in which quantitative limits for requirements falling with- in the scope of this standard are not stated but are left to agreement between interchange parties, standard test methods and measurement procedures sha
24、ll 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 Method A of American
25、Na- tional Standard Metric Practice, ANSI/ASTM E380-76. ANSI/IEEE 268.1976 (and Toleranced Dimensions - Conversion from Inches into Millimetres and Vice Versa, IS0 370.1975), except as noted. For current conversions of toleranced dimensions, use Method A or Method B (as appropriate) as described in
26、American National Standard Metric Practice, ANSI/IEEE 268. 1982. Method A should be used for economy unless a requirement for absolute assurance of a fit justifies use of Method B. In the national standards of IS0 member nations, additional rounding may be done to produce “preferred” values. These v
27、alues should lie within or close to the original tolerance ranges. Except as previously indicated, interchange parties complying with the acceptable standards should be able to achieve compatibility without need for addi- tional exchange of technical information. 2. Referenced Standards 2.1 American
28、 National Standard. This standard is in- tended for use in conjunction with American National Standard Metric Practice, ANSI/IEEE 268.1982. When this standard is superseded by a revision ap- proved by the American National Standards Institute, Inc, the revision shall apply. 5 Copyright American Nati
29、onal Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 23:50:15 MDTNo reproduction or networking permitted without license from IHS -,-,- AMERICAN NATIONAL STANDARD X3.125-1985 2.2 Other Standards. This standa
30、rd is also intended for use in conjunction with the fi , I : : , / I , 1 L-J -1%. u, - El - * F1 e Figure 3 Loading Area for Running Torque Slde 5.3.1.2 Requirement. The tensile yield force at 3% elongation shall be 14 lbf (62,3 N), minimum. 5.3.1.3 Procedure. Using a static-weighing, constant-rate-
31、of-grip separation tester capable of indi- cating the load to an accuracy of ?2%, clamp a speci- men 0.498 in + 0.002 in (12,649 mm + 0,051 mm) wide and at least 6 in (152,4 mm) long with an initial separation of 4 in (101,6 mm), at a rate of 2 in/min (50,8 mm/min) a minimum elongation of 10% is rea
32、ched. The force required to produce an elongation of 3% is the tensile yield force. 5.3.2 Tear Resistance. The tear resistance (Elmen- dorf tear strength) shall be a minimum of 1.89 ozf (0,5 1 N) when measured in accordance with ASTM D 1922-67. S-3.3 Coefficients of Expansion 5.3.3.1 Thermal. The co
33、efficient of linear thermal expansion shall be within a range from 0 to a maximum of 13.8 /.dn/in/” F (0 to a maximum of 25 X 1 O- 6 cm/cm/“C). / Slde 0 Dimension Inch mm Cl 2.35 59,69 Dl 1.25 31,73 El 0.45 11,43 Ft 0.85 21,59 5.3.3.2 Hygroscopic. The maximum value for the coefficient of linear hygr
34、oscopic expansion shall be 15 fin/in/% RH (15 X 1 OA6 cm/cm/% RH) in all direc- tions. 5.3.4 Substrate Material. Biaxially oriented poly- ethylene terephthalate or an equivalent material that meets the physical requirements of this standard shall be used as the substrate material. 5.4 Disk Coating 5
35、.4.1 Abrasivity. Abrasivity is defined as that char- acteristic of a disk that results in wear or abrasion of a read/write head. Disks shall not cause excessive wear to the read/write head over the range of 1.23 to 2.46 in (31,24 to 62,48 mm) radius. The allowable limits of head wear and the procedu
36、res for measuring shall be negotiated between the concerned parties. See Ap- pendix C for a procedure that might be used to define the end-of-life. 5.4.2 Wear Resistance. Wear resistance of the disk 11 Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=U
37、SN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/08/2007 23:50:15 MDTNo reproduction or networking permitted without license from IHS -,-,- AMERICANNATIONALSTANDARDX3.125-1985 shall be determined on the outermost track with speed and loading conditions given in 5:2.1. A dual-head assem
38、bly whose configuration is agreed upon between the interchange parties shall be used with the heads loaded on the disk. The test shall be performed at 73” f 5F (23,O” f 3C) with a relative humidity of 40 to 60%. The end of the test shall be determined when the 250 000 ftps signal amplitude of any tr
39、ack on either side of the disk has decreased 25% from its average value at the start of the test. The minimum number of wear revolutions shall be negotiated be- tween the concerned parties. 5.4.3 Light Resistance. The index hole track of the disk shall have a light transmittance, measured with an op
40、tic system as described in 3.13, of not more than 1% at every point except the index hole and sec- tor holes (see Appendix A). 5.5 Magnetic Coating Resistivity. The surface resistiv- ity of the magnetic disk coating shall be less than 5 X IO9 ohms per square. This measurement shall be made in accord
41、ance with ASTM D 257-78. 5.6 Flammability. The disk cartridge shall be self- extinguishing in a still carbon dioxide atmosphere. 5.7 Toxicity. The disk cartridge should not cause bodily harm by contact during normal use. 6. Test Track Requirements (Track and Recording Information) 6.1 Number. There
42、shall be 40 discrete concentric tracks in the recording area on each side of the disk. 6.2 Width. The recorded track width on the disk sur- face shall be 0.0118 in + 0.0010 in (0,2997 mm * 0,0254 mm). The area between the tracks shah be erased. 6.3 Location 6.3.1 Nominal Locations. The nominal radiu
43、s R of the centerline of all tracks shall be calculated by using the formula: N. RN =X- 2u-r (RN=X-$X25.4-) where X = 2.2500 in for side 0 2.1667 in for side 1 N = 00 to 39 (the track number) 6.3.2 Tolerance. The centerline of the recorded tracks in the test environment (4.1.2) shall be within *O.OO
44、l in (?0,025 mm) 07 nominal positions. 6.3.3 Recording Offset Angle. At the instant of writing or reading a magnetic transition, the transition shall have an angle of 0” t 12 with the radius. 6.4 Physical Identification. Track identification shah be a two-digit decimal number that identifies the tra
45、cks consecutively, starting at the outermost track (00). 6.5 Index. The index is the point that determines the beginning and the end of a track. At the instant of hav- ing detected the leading edge of the index hole, the index is under the read-write gap. 7. Standard Reference Surfaces 7.1 General.
46、The magnetic properties shall be uniform between the radii shown in the following table and as specified in other sections of this standard. Radii Side 1.437 - 2.260 in (36,499 - 57,404 mm) 0 1.354 - 2.180 in (34,392 - 55,372 mm) 1 7.2 Primary Standard Amplitude Reference Surfaces. The primary stand
47、ard amplitude reference surface is the disk or disks held by NBS or other approved stan- dards organizations as the amplitude reference surface by which all secondary standard amplitude reference surfaces shah be calibrated. 7.3 Secondary Standard Amplitude Reference Sur- faces. A secondary standard
48、 amplitude reference sur- face is a disk that has been measured (calibrated) rela- tive to the primary standard amplitude reference sur- face on the NBS or other approved measurement system. 8. Magnetic Characteristics 8.1 Data Surfaces. For correlation purposes, the mag- netic properties of the dat
49、a surfaces are defined by the testing requirements given in 8.1 .l through 8.1.6 for both surfaces (side 00 and side 1). 81.1 Test Conditions. The disk shall be tested at 300 r/mm + 7 r/min. The test recording frequency is either 125 000 ftps or 250 000 ftps. The test recording current for the appropriate side shall be used for all recording frequencies. 12