BS ISO IEC 12247-1994 Information technology - 3 81 mm wide magnetic tape cartridge for information interchange - Helical scan recording - DDS format using 60 m and 90 m l.pdf
《BS ISO IEC 12247-1994 Information technology - 3 81 mm wide magnetic tape cartridge for information interchange - Helical scan recording - DDS format using 60 m and 90 m l.pdf》由会员分享,可在线阅读,更多相关《BS ISO IEC 12247-1994 Information technology - 3 81 mm wide magnetic tape cartridge for information interchange - Helical scan recording - DDS format using 60 m and 90 m l.pdf(98页珍藏版)》请在麦多课文档分享上搜索。
1、BRITISH STANDARD BS ISO/IEC 12247:1993 Implementation of ISO/IEC12247:1993 Information technology 3,81mm wide magnetic tape cartridge for information interchange Helical scan recording DDS format using60m and90m length tapes UDC 681.327.636BSISO/IEC12247:1993 This BritishStandard, having been prepar
2、ed under the directionof the Information Systems Technology StandardsPolicy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15April1994 BSI02-2000 The following BSI references relate to the work on this standard: Committee referenceIST/4 Draft for comment92/
3、66915DC ISBN 0 580 23307 3 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Information Systems Technology Standards Policy Committee(IST/-) to Technical CommitteeIST/4, upon which the following bodies were represented: British Computer Soc
4、iety ICI Imagedata Institute of Quality Assurance Institution of Electrical Engineers International Computers Limited Kodak Limited Amendments issued since publication Amd. No. Date CommentsBSISO/IEC12247:1993 BSI 02-2000 i Contents Page Committees responsible Inside front cover National foreword ii
5、 Foreword viii Text of ISO/IEC12247 1BSISO/IEC12247:1993 ii BSI 02-2000 National foreword This BritishStandard reproduces verbatim ISO/IEC12247:1993 and implements it as the UK national standard. This BritishStandard is published under the direction of the Information Systems Technology Standards Po
6、licy Committee whose Technical CommitteeIST/4 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European devel
7、opments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, Publications, BSI, Linford Wood, Milton Keynes, MK146LE. A British Standard does not purport to include all the necessary provisions of a contract. Us
8、ers of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theISO/IEC title page, pages ii to viii,
9、pages1 to84 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.ISO/IEC12247:1993 (E) ii BSI 02-2000 Contents Page Foreword viii Introduction 1 Section 1. General 1 Sco
10、pe 1 2 Conformance 1 2.1 Magnetic tape cartridge 1 2.2 Generating system 2 2.3 Receiving system 2 3 Normative references 2 4 Definitions 2 4.1 Absolute Frame Number (AFN) 2 4.2 Area ID 2 4.3 Automatic Track Finding (ATF) 3 4.4 Average Signal Amplitude 3 4.5 azimuth 3 4.6 back surface 3 4.7 byte 3 4.
11、8 cartridge 3 4.9 Channel Bit 3 4.10 Data Format ID 3 4.11 Early Warning Point (EWP) 3 4.12 End of Data (EOD) 3 4.13 Error Correcting Code (ECC) 3 4.14 flux transition position 3 4.15 flux transition spacing 3 4.16 frame 3 4.17 Housekeeping Frame 4 4.18 Logical Beginning of Tape (LBOT) 4 4.19 magnet
12、ic tape 4 4.20 Master Standard Amplitude Calibration Tape 4 4.21 Master Standard Reference Tape 4 4.22 Optimum Recording Field 4 4.23 partition boundary 4 4.24 Physical Beginning of Tape (PBOT) 4 4.25 Physical End of Tape (PEOT) 4 4.26 physical recording density 4 4.27 pre-recording condition 4 4.28
13、 record 4 4.29 Reference Recording Field 4 4.30 Secondary Standard Amplitude Calibration Tape 5 4.31 Secondary Standard Reference Tape 5 4.32 Separator Mark 5 4.33 Standard Reference Amplitude 5 4.34 Tape Reference Edge 5 4.35 Test Recording Current 5 4.36 track 5 4.37 Virtual End of Tape (VEOT) 5 5
14、 Environment and safety 5 5.1 Testing environment 5 5.2 Operating environment 5ISO/IEC12247:1993 (E) BSI 02-2000 iii Page 5.3 Storage environment 6 5.4 Transportation 6 5.5 Safety 6 5.6 Flammability 6 Section 2. Requirements for the case 6 Dimensional and mechanical characteristics of the case 6 6.1
15、 General 6 6.2 Overall dimensions 7 6.3 Loading grip 7 6.4 Holding areas 7 6.5 Notches of the lid 7 6.6 Lid dimensions 8 6.7 Optical detection of the beginning and end of tape 8 6.8 Bottom side 9 6.8.1 Locking mechanism of the slider 9 6.8.2 Access Holes 9 6.8.3 Recognition, Sub-datums, and Write-in
16、hibit Holes 10 6.8.4 Datum Holes 11 6.8.5 Access room for tape guides 11 6.8.6 Holes for accessing the hubs 12 6.8.7 Internal structure of the lower half 12 6.8.8 Light path 13 6.8.9 Support Areas 13 6.8.10 Datum Areas 13 6.8.11 Relationship between Support and Datum Areas and Reference Plane Z 13 6
17、.9 Hubs 14 6.10 Leader and trailer attachment 14 6.11 Interface between the hubs and the drive spindles 14 6.12 Opening of the lid 14 6.13 Release of the hub locking mechanism 14 6.14 Label areas 15 Section 3. Requirements for the unrecorded tape 7 Mechanical, physical and dimensional characteristic
18、s of the tape 25 7.1 Materials 25 7.2 Tape length 26 7.2.1 Length of magnetic tape 26 7.2.2 Length of leader and trailer tapes 26 7.2.3 Length of splicing tapes 26 7.3 Tape width 26 7.3.1 Width of magnetic, leader and trailer tapes 26 7.3.2 Width and position of splicing tape 26 7.4 Discontinuities
19、26 7.5 Total thickness 26 7.6 Longitudinal curvature 26 7.7 Cupping 26 7.8 Coating adhesion 27 7.9 Layer-to-layer adhesion 27ISO/IEC12247:1993 (E) iv BSI 02-2000 Page 7.10 Tensile strength 27 7.10.1 Breaking strength 27 7.10.2 Yield strength 28 7.11 Residual elongation 28 7.12 Electrical resistance
20、of coated surfaces 28 7.13 Light transmittance of the tape 29 8 Magnetic recording characteristics 29 8.1 Optimum Recording Field 29 8.2 Signal amplitude 29 8.3 Resolution 29 8.4 Overwrite 30 8.4.1 Physical recording densities of750,6ftpmm and3002ftpmm 30 8.4.2 Physical recording densities of83,4ftp
21、mm and1001ftpmm 30 8.5 Ease of erasure 30 8.6 Tape quality 30 8.6.1 Missing pulses 30 8.6.2 Missing pulse zone 30 8.7 Signal-to-noise ratio (S/N) characteristic 30 Section 4. Requirements for an interchanged tape 9 Format 31 9.1 General 31 9.2 Basic Groups 31 9.2.1 Group Information Table 32 9.2.2 B
22、lock Access Table 33 9.3 Sub-Groups 36 9.3.1 G1 Sub-Group 36 9.3.2 G2 Sub-Group randomizing 36 9.3.3 G3 Sub-Group 36 9.3.4 G4 Sub-Group 38 9.3.5 Main Data Block 42 9.4 Sub Data Area 43 9.4.1 Pack Item No.1 44 9.4.2 Pack Item No.2 44 9.4.3 Pack Item No.3 45 9.4.4 Pack Item No.4 46 9.4.5 Pack Item No.
23、5 47 9.4.6 Pack Item No.6 47 9.4.7 Pack Item No.7 48 9.4.8 Pack Item No.8 48 9.4.9 Sub Data Block 49 10 Method of recording 52 10.1 Physical recording density 52 10.2 Long-term average bit cell length 52 10.3 Short-term average bit cell length 52 10.4 Rate of change 52 10.5 Bit shift 52 10.6 Read si
24、gnal amplitude 52 10.7 Maximum recorded levels 52ISO/IEC12247:1993 (E) BSI 02-2000 v Page 11 Track geometry 52 11.1 Track configuration 52 11.2 Average track pitch 53 11.3 Variations of the track pitch 53 11.4 Track width 53 11.5 Track angle 53 11.6 Track edge linearity 53 11.7 Track length 54 11.8
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
本资源只提供5页预览,全部文档请下载后查看!喜欢就下载吧,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- BSISOIEC122471994INFORMATIONTECHNOLOGY381MMWIDEMAGNETICTAPECARTRIDGEFORINFORMATIONINTERCHANGEHELICALSCANRECORDINGDDSFORMATUSING60MAND90MLPDF

链接地址:http://www.mydoc123.com/p-396263.html