1、ECMA ECMA*Lb9 72 6 3404593 0013852 837 ECMA EUROPEAN COMPUTER MANUFACTURERS ASSOCIATION STANDARD ECMA-169 8mm WIDE MAGNETIC TAPE CARTRIDGE DUAL AZIMUTH FORMAT FOR INFORMATION INTERCHANGE = HELICAL SCAN RECORDING - August 1992 ECMA ECMA*lbCI 92 3404593 0033853 773 ECMA EUROPEAN COMPUTER MANUFACTURERS
2、 ASSOCIATION STANDARD ECMA469 8 mrn WIDE MAGNETIC TAPE CARTRIDGE DUAL AZIMUTH FORMAT FOR INFORMATION INTERCHANGE = HELICAL SCAN RECORDING - August 1992 ECMA ECMA*lb9 92 = 3404593 0013854 bOT Brief History ECMA have produced a series of ECMA Standards for cassettes and cartridges containing magnetic
3、tapes of different width and characteristics. ECMA-34 (1976) : ECMA-46 (1976) : ECMA-79 (1985) : ECMA-98 (1985) : ECMA-120 (1987) ECMA-139 (1990) ECMA-145 (1990) : ECMA-146 (1990) : ECMA-150 (1991) : ECMA-152 (1991) : Data Interchange on 3.81 mm Magnetic Tape Cassette (32 bpmm, Phase Encoded) Data I
4、nterchange on 6,30 mm Magnetic Tape Cartridge (63 bpmm, Phase Encoded) Data Interchange on 6,30 mm Magnetic tape Cartridge Using IMFM Recording at 252 ftpmm Data Interchange on 6.30 mm Magnetic Tape Cartridge Using NFUl Recording at 394 ftpmm - Streaming Mode Data Interchange on 12,7 mm 18-Track Mag
5、netic Tape Cartridges 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - DDS Format 8 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - 3,81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Record
6、ing - DATA/DAT Format 3.81 mm Wide Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording - DDS-DC Format Data Interchange on 12.7 mm 18-Track Magnetic Tape Cartridges - Extended Format - The first five of these media were designed for the digital recording of data for storage
7、and processing in data processing systems. In recent years, other magnetic media, originally developed for audio and video applications, have been considered for use in data processing applications for storage as well as for information interchange. The recording method known as helical scan recordi
8、ng, together with new types of magnetic tapes, allows to achieve capacities of more than 1 gigabyte of user data. Standards ECMA-139, ECMA-145, ECMA-146, and ECMA-150 are the first of a series of ECMA Standards for such magnetic tape cartridges. This Standard ECMA-169 is the next one of this series.
9、 It is based on Standard ECMA-145 with extensions and modifications which specify the additional features of the Dual Azimuth format. The specifications of the tape, cartridge, recorded signal, recording method and much of the recorded format are identical with those in Standard It is not intended t
10、hat this Standard replace Standard ECMA-145. Existing drives and cartridges which conform to Standard ECMA-145 will continue to do so and will not conform to this Standard. Future drives and tapes which conform to Standard ECMA-145 may, in addition, conform to this Standard, but only if they support
11、 those features herein which are not in Standard ECMA-145. Upon request of Committee ISO/IEC JTCl/SC11, Standards ECMA-139, ECMA-145, ECMA-146 and ECMA-150 have been contributed to ISODEC JTCl and adopted, under the fast-track procedure, as International Standards ISO/IEC 10777, ISO/IEC 11319, ISO/I
12、EC 11321 and ISO/IEC 11557, respectively. ECMA-145. Adopted as an ECMA Standard by the General Assembiy of June 1992. ECMA ECMA*169 92 3Y04573 0013855 546 -1- Table of contents SECTION I - GENERAL 1 Scope 2 Conformance 3 References 4 Definitions 4.1 AC Erase 4.2 Algorithm 4.4 Azimuth 4.5 Back Surfac
13、e 4.6 Bit Cell 4.7 Byte 4.8 Cartridge 4.9 Compressed Data 4.10 Cyclic Redundancy Check 4.1 1 Error Correcting Code (ECC) 4.12 Flux Transition Position 4.13 Flux Transition Spacing 4.14 Logical Record 4.15 Magnetic Tape 4.16 Master Standard Reference Tape 4.17 Physical Beginning of Tape (PBOT) 4.18 P
14、hysical End of Tape (PEOT) 4.19 Physical Recording Density 4.20 Secondary Reference Amplitude 4.21 Secondary Reference Field 4.22 Secondary Standard Reference Tape 4.23 Standard Reference Current (Ir) 4.24 Tape Reference Edge 4.25 Test Recording Current 4.26 Track 4.27 Typical Field 4.28 Uncompresse
15、d Data 4.3 Average Signal Amplitude 5 Environment and Safety 5.1 Testing Environment 5.2 Operating Environment 5.3 Storage Environment 5.4 Transportation 5.5 Safety 5.6 Flammability SECTION II - REQUIREMENTS FOR THE CASE 6 Dimensional and Mechanical Characteristics of the Case L Page 1 1 1 1 1 1 1 1
16、 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 6.1 General 6.2 Overall Dimension (figure 3) 6.3 Holding Areas 6.4 Cartridge Insertion 6.5 Window (figure 1) 6.6 Loading Grips (figure 3) 6.7 Label Areas (figure 3) 6.8 Datum Areas and Datum Holes (figures 4.5 and 6) 6.9 Support Ar
17、eas 6.10 Recognition Holes (figures 5.6 and 7) 6.11 Write-inhibit Hole (figures 6 and 7) 6.12 he-positioning Surfaces (figures 3 and 5) 6.14 Cartridge Reel Lock (figure 11) 6.15 Reel Access Holes (figure 5) 6.16 Interface between the Reels and the Drive Spindles (figures 17 and 18) 6.17 Light Path (
18、figures 57, 15 and 16) 6.18 Position of the tape in the case ( figure 16 ) 6.19 Tape Path Zone (figures 16 and 17) 6.20 Tape Access Cavity (figure 5) 6.21 Tape Access Cavity Clearance Requirements 6.13 Cartridge Lid (figures 3 and 8) SECTION III - REQUIREMENTS FOR THE UNRECORDED TAPE 7 Mechanical, P
19、hysical and Dimensional Characteristics of the Tape 7.1 Materials 7.2 Tape Length 7.2.1 Magnetic Tape 7.2.2 Leader and Trailer Tapes 7.2.3 Splicing Tape 7.3 Width32 7.4 Discontinuities 7.5 Thickness 7.5.1 Thickness of Magnetic Tape 7.5.2 7.6 Longitudinal Curvature 7.7 Cupping 7.8 Coating Adhesion (f
20、igure 20) 7.9 Layer-to-Layer Adhesion 7.10 Tensile Strength Thickness of Leader and Trailer Tape 7.10.1 Breaking Strength 7.10.2 Yield Strength 7.1 1 Residual Elongation 7.12 Electrical Resistance of the Surface 7.13 Tape Winding 7.14 Light Transmittance of Tape 8 Magnetic Recording Performance 4 5
21、5 5 6 6 6 7 8 8 9 9 10 11 12 12 13 14 14 15 15 32 32 32 32 32 32 32 32 32 32 32 32 33 33 34 34 34 34 34 35 36 36 36 _- - ECMA ECMA%369 92 = 3404593 0033857 319 . - 111 - 8.1 Test Conditions 8.2 Typical Field 8.3 Signal Amplitude 8.4 Resolution 8.5 Narrow-band Signal-to-noise Ratio 8.5.1 Requirement
22、8.5.2 Procedure 8.6 Ease of Erasure 8.7 Tape Quality 8.7.1 Missing Pulses 8.7.2 Missing Pulse Zone 8.8 Inhibitor Tape SECTION IV - REQUIREMENTS FOR AN INTERCHANGED TAPE 9 Format 9.1 General 9.2 Information Matrix 9.2.1 Loading of the Information Matrix 10 Method of Recording 10.1 Physical Recording
23、Density 10.1.1 Long-Term Average bit Cell Length 10.1.2 Short-Term Average bit Cell Length 10.1.3 Rate of Change 10.2 Bit Shift 10.3 Read Signal Amplitudes 10.3.1 Amplitude of Data Signals 10.3.2 Amplitude of Servo Signals 10.4 Erasure 11 Track geometry 11.1 Track Positions 11.2 Track Pitch 11.2.1 A
24、djacent Track Pitch 11.2.2 Average Track Pitch 11.3 Track Width 11.4 Track Angle 11.5 Straightness of Track Edge 11.6 Azimuth 12 Format of a Track 12.1 Channel bit 12.2 Information Segment 36 36 36 36 36 37 37 37 37 37 37 37 37 37 37 38 39 44 44 44 44 44 45 45 45 45 45 46 46 47 47 47 47 47 47 47 47
25、47 47 ECHA ECMA*lbS 92 M 3404593 0053P15B 255 W - iv - 12.2.1 Bit Synchronization Field 12.2.2 Information Segment Number 12.2.3 Information Segment field 12.3 Information Block 12.4 Physical Track Types 12.4.1 T1 and T2 Track Layouts 12.5 Search Field Zones 12.5.1 Search Field Data Zones 12.5.2 Sea
26、rch Field Zone Sequence of Recording 12.6 Servo Zone 12.6.1 Servo Zone 1 12.6.2 Servo Zone 2 12.6.3 Servo Zone 3 12.7 Information Tracks 12.7.1 Format Track 12.7.2 Data Track 12.7.3 Long Tape Mark Track 12.7.4 Gap Track 12.7.5 End of Data Track 13 TapeMark 13.1 Long Tape Mark 13.2 Short Tape Mark 14
27、 EndofData 15 ID Information 15.1 Physical Block ID 15.2 Logical Block ID 15.3 Logical Record ID 15.4 Block Type 15.4.1 Data Block 15.4.2 Gap Block 15.4.3 Format Block 15.4.4 Long/Short Tape Mark Block 15.4.5 End of Data Block 16 Rewritten Information Blocks 17 Physical Tape Format 17.1 Initial Eras
28、ed Area 17.2 Logical Beginning of Tape Area (LBOT Area) 17.3 Usable Area of the Tape Annex A - Measurement of LIght Transmittance of Tape and Leaders Annex B - Measurement of Bit Shift 48 48 49 49 49 50 50 50 52 53 53 53 53 53 53 53 53 54 54 54 54 54 54 54 54 54 55 55 55 56 56 57 57 58 58 58 58 58 5
29、9 63 ECMA ECMA*169 92 = 3404593 0013859 191 -v- Annex C - Representation of r Channel bit. ECMA ECMA*libS 72 M 3404573 OOIi3Bh3r B4T W -2- 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 4.21 Byte An ordered set of bits acted upon as a unit. Cartridge A case containing magnetic ta
30、pe stored on twin reels. Compressed Data The representation of host-transmitted data after transformation by a data compression algorithm. Cyclic Redundancy Check A character used for error detection. Error Correcting Code (ECC) A mathematical procedure yielding bytes used for the detection and corr
31、ection of errors. Flux Transition Position That point on the magnetic tape that exhibits the maximum free-space flux density normal to the tape surface. Flux Transition Spacing The distance along a track between successive flux transitions. Logical Record Related data, from the host, treated as a un
32、it of information. Magnetic Tape A tape that accepts and retains magnetic signals intended for input. output, and storage of data for information processing. Master Standard Reference Tape A tape selected as the standard for amplitude, Typical Field and Resolution. NOTE I The Masrer Srandard Referen
33、ce Tape has been established by rhe SONY Corporarion. Physical Beginning of Tape (PBOT) The transition from the tape leader to the opaque area of the splice by which the translucent leader tape is joined to the magnetic tape. Physical End of Tape (PEOT) The transition from the opaque area of fhe spl
34、ice to the translucent trailer tape. Physical Recording Density The number of recorded flux transitions per unit length of track, e.g., flux transitions per millimetre (ftpmm) . Secondary Reference Amplitude The Average Signal Amplitude from the Secondary Standard Reference Tape when it is recorded
35、with the Test Recording Current at 2 236 ftpmm. Secondary Reference Field The Typical Field of the Secondary Standard Reference Tape. 4.22 4.23 4.24 4.25 4.26 4.27 4.28 5 5.1 5.2 ECMA ECMA*169 92 = 3404593 0013862 786 -3- - Secondary Standard Reference Tape A tape the performance of which is known a
36、nd stated in relation to that of the Master Standard Reference Tape. NOTE 2 secondary Standard Reference Tapes can be ordered under the Part Number RSE-5001, until the year 2001, from the Sony Corporation, Magnetic Product Group, Data Media Sales Division, 6-7-35 Kitashinagawa, Shinagawa-ku, TOKYO 1
37、41, Japan. It is intended that these be used for calibrating Tertiary Reference Tapes for use in routine calibration. Standard Reference Current (Ir) The current that produces the Secondary Reference Field. Tape Reference Edge The lower edge of the tape when the magnetic coating is facing the observ
38、er and the supply reel is to the observers right. Test Recording Current The current that is 1.5 times the Standard Reference Current. Track A diagonally positioned area on the tape along which a series of magnetic transitions may be recorded. Typical Field In the plot of the Average Signal Amplitud
39、e against the recording field at the physical recording density of 2 236 ftpmm, the minimum field that causes an Average Signal Amplitude equal to 90 % of the maximum Average Signal Amplitude. Uncompressed Data Data from the host which is not transformed by a data compression algorithm. Environment
40、and Safety The conditions specified below refer to ambient conditions immediately surrounding the cartridge. Cartridges exposed to environments outside these limits may still be able to function usefully; however, such exposure may cause permanent damage. Testing Environment Unless otherwise specifi
41、ed, tests and measurements made on the cartridge to check the requirements of this Standard shall be carried out under the following conditions. Temperature: Relative Humidity: Conditioning period before testing: Operating Environment Cartridges used for data interchange shall be capable of operatin
42、g under the following conditions: 23 “C f 2 “C 40 % to 60 % 24 hours Temperature: Relative Humidity: Wet Bulb Temperature: There shall be no deposit of moisture on or in the cartridge. 5 “C to 45 “C 20 % to 80 % 26 “C max _- _- ECMA ECMA*11bS 92 U 3LiOY593 00113863 bL? W -4- 5.3 5.4 5.5 5.6 Conditio
43、ning before operating: If a cartridge has been exposed during storage and/or transportation to a condition outside the above values, the cartridge shall be conditioned before use in the operating environment for a time at least equal to the period during which it has been out of the operating enviro
44、nment, up to a maximum of 24 hours. NOTE 3 Rapid variaiions of remperarure should be avoided. Storage Environment For long-term or archival storage of cartridges the following conditions shall be observed: Temperature: 5 OC to 32 OC Relative Humidity: 20 % to 60 % Wet Bulb Temperature: 26 OC max The
45、 stray magnetic field at any point on the tape shall not exceed 4 O00 Nm. There shall be no deposit of moisture on or in the cartridge. Transportation Recommended limits for the environment to which a cartridge may be subjected during transportation, and the precautions to be taken to minimise the p
46、ossibility of damage, are provided in annex D. Safety The cartridge and its components shall satisfy the requirements of ECMA-129. Flammability The tape and the case components shall be made from materials which, when ignited from a match flame, do not continue to burn in a still carbon dioxide atmo
47、sphere. SECTION II - REQUIREMENTS FOR THE CASE 6 Dimensional and Mechanical Characteristics of the Case 6.1 General The case of the cartridge shall consist of: - an upper half, - a lower half. - a lid pivotally mounted on the upper half. In the drawings, an embodiment of the cartridge is shown as an
48、 example. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 is a perspective view of the cartridge seen from the top. is a perspective view of the cartridge seen from the bottom. shows the top side with the lid closed using third angle projection. s
49、hows the bottom side. datum and support areas. shows the bottom side with the lid removed. shows the enlarged view of the datum and recognition holes. shows the cross-sections through the light path holes, the recognition holes and the write- inhibit hole shows details of the lid when closed, rotating and open. shows the details of the lid release insertion channel. shows the lid lock release requirements. shows the reel lock release requirements. 6.2 6, 6.4 ECMA ECMA*Lb9 92 m 3404593 0013864 559 m -5- Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 sho
