ISO/IEC INTERNATIONAL STANDARD 11557 First edition 1992-12-15 Information technology -- 3,81 mm wide magnetic tape cartridge for information interchange -- Helical scan recording DDS-DC format using 60 m and 90 m length tapes Technologies de I'information -- Cartouche de bande magnetique de 3.81 mm de large pour I'échange d'information - Enregistrement hélicoidal -Format DDS-DC utilisant des bandes de 60 m et 90 m de long Reference number ISO/IEC 11557:1992(E) Copyright Intermational Organization for Standardization Not for Resale ISO/IEC 11557:1992 (E) Contents Page Section 1 . General 1 1 Scope 1 2 Normative references I 3 2 Conformance 3.1 Magnetic tape cartridge 2 3.2 Generating system 2 3.3 Receiving system 2 4 Definitions 3 4.1 Absolute Frame Number 3 4.2 Access Point 3 4.3 algorithm 3 3 4.4 Automatic Track Finding 4.5 Area ID 3 Average Signal Amplitude 3 4.6 4.7 azimuth 3 4.8 back surface 3 4.9 byte 3 4.10 cartridge 3 4.11 Channel Bit 3 4.12 Codeword 3 4.13 Data Format ID 3 4.14 Early Warning Point 3 4.15 End of Data 3 4.16 Entity 3 4.17 Error Correcting Code 4 4.18 flux transition position 4 4.19 flux transition spacing 4 4.20 frame 4 4 4.21 Housekeeping Frame 4.22 Logical BeginningofTape 4 4.23 magnetic tape 4 4.24 Master Standard Amplitude Calibration Tape 4 4.25 Master StandardReference Tape 4 ISO/IEC1992 by, any means, electronic or mechanical, including photocopying and microfilm, without per- mission in writing from the publisher. ISO/IEC Copyright Office · Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzeriand No reprod nitted without license from IHS Not for Resale ISO/IEC 11557:1992 (E) 4.26 Optimum Recording Field 4 4.27 Partition boundary 4 4.28 Physical Beginning of Tape 4 4.29 Physical End of Tape 4 4.30 physical recording density 4 4.31 pre-recording condition 4 4.32 processing 4 4.33 processed data 4 4.34 Processed Record 5 4.35 Processed Record Sequence 5 4.36 Record 5 4.37 Reference Recording Field 5 4.38 reprocessing 5 4.39 Secondary Standard Amplitude Calibration Tape 5 4.40 Secondary Standard Reference Tape 5 4.41 Separator Mark 5 4.42 Standard Reference Amplitude 5 4.43 Tape Reference Edge 5 4.44 Test Recording Current 5 4.45 5 track 4.46 Unprocessed Data 5 4.47 Unprocessed Record 5 4.48 Virtual End of Tape 5 5 Environment and safety 5 5.1 Testing environment 5 5.2 Operating environment 6 5.3 Storage environment 6 5.4 Transportation 6 5.5 Safety 6 5.6 Flammability 6 Section 2 - Requirements for the case 6 6 Dimensional and mechanical characteristics of the case 6 6.1 General 6 6.2 Overall dimensions (figures 6 and 7) 7 6.3 Loading grip (figure 6) 8 6.4 Holding areas (figure 6) 8 6.5 Notches of the lid (figures 5 and 8) 8 6.6 Lid dimensions (figures 6 to 8) 8 6.7 Optical detection of the beginning and end of tape (figures 9 and 12) 9 6.8 Bottom side (figures 10 and 11) 10 6.8.1 Locking mechanism of the slider 10 6.8.2 Access holes 10 6.8.3 Recognition, sub-datums, and write-inhibit holes 11 6.8.4 Datum holes 12 6.8.5 Access room for tape guides 13 6.8.6 Holes for accessing the hubs 13 6.8.7 Internal structure of the lower half (figure 12) 13 iii CopyheatioaOrganizatioorStandadizatio ed without license from IHS Not for Resale IS0/IEC 11557:1992 (E) Light path (figure 12) 14 6.8.8 6.8.9 Support Areas (figure 13) 15 6.8.10 Datum Areas (figure 13) 15 6.8.11 Relationship between Support and Datum Areas and Reference Plane Z (figure 14) 15 6.9 Hubs (figures 15 and 16) 15 6.10 Leader and trailer attachment 16 6.11 Interface between the hubs and the drive spindles (figure 17) 16 6.12 Opening of the lid (figure 18) 16 6.13 Release of the hub locking mechanism (figures 19 and 20) 16 6.14 Label areas (figures 21 and 22) 17 Section 3 - Requirements for the unrecorded tape 28 7 Mechanicai, physical and dimensional characteristics of the tape 28 7.1 Materials 28 7.2 Tape length 28 7.2.1 Length of magnetic tape 28 7.2.2 Length of leader and trailer tapes 28 7.3 Tape width 28 7.4 Discontinuities