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1、INTERNATIONAL STANDARD ISO/IEC 13923 First edition 1996-l 2-15 Information technology - 3,81 mm wide magnetic tape cartridge for information interchange - Helical scan recording - DDS-2 format using 120 m length tape Technologies de /information - Cartouche de bande magn - the recording of multiple
2、representations of the same Basic Group; - the generation of ECC3 Frames. In addition a claim of conformance shall state - whether or not one, or more, registered algorithm(s) are implemented within the system and are able to process data received from the host prior to collecting the data into Basi
3、c Groups, and - the algorithm registration identification number(s) of the implemented algorithm(s). Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/06/2007 22:55:43 MDTNo reproduction or
4、networking permitted without license from IHS -,-,- ISOIIEC 13923:1996(E) 0 ISO/IEC 2.3 Receiving system A system receiving a magnetic tape cartridge for interchange shall be entitled to claim full conformance with this International Standard if it is able to handle any recording made on the tape ac
5、cording to this International Standard. In particular it shall - be able to recognize repeated Frames and to make available to the host, data and Separator Marks from only one of these Frames; - be able to recognize multiple representations of the same Basic Group, and to make available to the host,
6、 data and Separator Marks from only one of these representations; - be able to recognize an ECC3 Frame, and ignore it if the system is not capable of using ECC3 check bytes in a process of error correction; - be able to update the System Log(s) if the Write-inhibit Hole state so permits; - be able t
7、o recognize processed data within an Entity, identify the algorithm used, and make the algorithm registration number available to the host; - be able to make processed data available to the host. In addition a claim of conformance shall state - whether or not the system is capable of using ECC3 chec
8、k bytes in a process of error correction; - whether or not one or more Reprocessing algorithm(s) are implemented within the system, and are able to be applied to Processed Data prior to making such data available to the host; - the algorithm registration number(s) of the processing algorithm(s) for
9、which a complementary Reprocessing algorithm is implemented. 3 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are
10、 subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain regesters of currently valid international standards. ISO/R 527: 1
11、966, Plastics - Determination of tensile properties. IS0 1302: 1992, Technical drawings - Method of indicating surface texture. ISO/IEC 11576: 1994, Information technology - Procedure for the registration of algorithms for the lossless compression of data. IEC 950 :1991, Safety of information techno
12、logy equipment including electrical business equipment. 4 Definitions For the purposes of this International Standard, the following definitions apply. 4.1 4.2 4.3 4.4 4.5 4.6 2 Absolute Frame Number (AFN) : A sequence number, encoded in the Frame. a.c. erase : A process of erasure utilising magneti
13、c fields of decaying intensity. Access Point : A point, at the start of a processed record sequence, at which the presentation of Codewords to a reprocessing algorithm is required to start, regardless of whether the data of interest in a retrieval operation starts at that point or at a subsequent po
14、int. Algorithm : A set of rules for transforming the logical representation of data. Area ID : An identifier defining the area of the tape and specifying the types of Frame written. Automatic Track Finding (ATF) : The method by which tracking is achieved. Copyright American National Standards Instit
15、ute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/06/2007 22:55:43 MDTNo reproduction or networking permitted without license from IHS -,-,- 0 ISO/IJx ISO/IEC 13923:1996(E) 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
16、 4.20 4.21 4.22 4.23 4.24 4.25 Average Signal Amplitude : The average peak-to-peak value of the output signal from the read head at the fundamental frequency of the specified physical recording density over a minimum of 7,8 mm of track, exclusive of missing pulses. azimuth : The angular deviation, i
17、n degrees, minutes and seconds of arc, made by the mean flux transition line with the line normal to the centreline of the recorded track. back surface : The surface of the tape opposite to the magnetic coating which is used to record data. byte : An ordered set of bits acted upon as a unit. cartrid
18、ge : A case containing magnetic tape stored on twin hubs. Channel bit : A bit after 8- 10 transformation. Codeword : A word which is generated by a processing algorithm. The number of bits in a Codeword is variable, and is not defined by this International Standard. Data Format ID : An identifier sp
19、ecifying which data format is being used on the tape. Early Warning Point (EWP) : A point along the length of the tape at which warning is given of the approach, in the forward direction of tape motion, of the partition boundary or of the Physical End of Tape. End of Data (EOD) : The point on the ta
20、pe at the end of the group which contains the last user data. Entity : A unit of recorded data, comprising a Processed Record Sequence preceded by housekeeping information. Error Correcting Code (ECC) : A mathematical computation yielding check bytes used for the detection and cor- rection of errors
21、. flux transition position : That point which exhibits maximum free-space flux density normal to the tape surface. flux transition spacing : The distance along a track between successive flux transitions. Frame : A pair of adjacent tracks with azimuths of opposite polarity, in which the track with t
22、he positive azimuth precedes that with the negative azimuth. Housekeeping Frame : A Frame which contains no user data and which is identified as such by the values in the data fields therein. Logical Beginning of Tape (LBOT) : The point along the length of the tape where a recording of data for inte
23、rchange commences. magnetic tape : A tape which will accept and retain the magnetic signals intended for input, output and storage purposes on computers and associated equipment. Master Standard Amplitude Calibration Tape : A pre-recorded tape on which the standard signal amplitudes have been record
24、ed in the tracks of positive azimuth, 21 pm wide, recorded at a track pitch of 27,2 m, on an a.c. erased tape. Note 1 - The tape includes recordings made at 83.3 ftpmm, 333.3 ftpmm, 500 ftpmm. 1 000,O ftpmm and 1 499.9 ftpmm. Note 2 - The Master Standard Amplitude Calibration Tape has been establish
25、ed by Reliability Centre for Electronic Components of Japan (RCJ). Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/06/2007 22:55:43 MDTNo reproduction or networking permitted without licen
26、se from IHS -,-,- ISO/IEC 13923:1996(E) 0 ISO/IEC 4.26 4.27 4.28 4.29 4.30 4.31 4.32 4.33 4.34 4.35 4.36 4.37 4.38 4.39 4.40 4.41 4.42 4.43 Master Standard Reference Tape : A tape selected as the standard for Reference Recording Field, Signal Ampli- tude, Resolution, Overwrite and Signal-to-Noise Ra
27、tio. Note 3 - The Master Standard Reference Tape has been established by RCJ. Optimum Recording Field : In the plot of Average Signal Amplitude against the recording field at the physical recording density of 2 999,9 ftpmm, the field that causes the maximum Average Signal Amplitude. Partition Bounda
28、ry : The point along the length of a magnetic tape at which partition 1 ends and partition 0 commences. Physical Beginning of Tape (PBOT) : The point where the leader tape is joined to the magnetic tape. Physical End of Tape (PEOT) : The point where the trailer tape is joined to the magnetic tape. p
29、hysical recording density : The number of recorded flux transitions per unit length of track, expressed in flux transitions per millimetre (ftpmm). pre-recording condition (see annex F) : The recording levels above which a tape intended for interchange shall not previously have been recorded. proces
30、sing : Ihe use of an algorithm to transform host data into Codewords. processed data : A sequence of Codewords which results from the application of processing to data. Processed Record : A sequence of Codewords which results from the application of processing to an Unprocessed Record. Processed Rec
31、ord Sequence : A sequence of one or more Processed Records which starts on an g-bit boundary and ends on a subsequent g-bit boundary. record : Related data treated as a unit of information. Reference Recording Field : The Optimum Recording Field of the Master Standard Reference Tape. reprocessing :
32、The use of an algorithm to transform Codewords into data as required by the host. Secondary Standard Amplitude Calibration Tape : A tape pre-recorded as defined for the Master Standard Amplitude Calibration Tape; the outputs are known and stated in relation to those of the Master Standard Amplitude
33、Calibration Tape. Note 4 - Secondary Standard Amplitude Calibration Tapes can be ordered from RCJ, l-l-12 Hachiman-cho, Higashikurume. Tokyo 203, Japan, under Part Number JCM 6129 until the year 2005. It is intended that these be used for calibrating tertiary reference tapes for use in routine calib
34、ration. Secondary Standard Reference Tape : A tape the performance of which is known and stated in relation to that of the Master Standard Reference Tape. Note 5 - Secondary Standard Reference Tapes can be ordered from RCJ, I- 1- 12 Hachiman-cho, Higashikurume, Toyko 203, Japan, under Part Number JR
35、M 6129 until the year 2005. It is intended that these be used for calibrating tertiary reference tapes for use in routine calibration. Separator Mark : A record containing no user data, which is used to separate data. Standard Reference Amplitude : The Average Signal Amplitude from the tracks of pos
36、itive azimuth of the Master Standard Amplitude Calibration Tape at a specified physical recording density. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/06/2007 22:55:43 MDTNo reproducti
37、on or networking permitted without license from IHS -,-,- 0 ISO/IEC ISO/IEC 13923: 1996(E) 4.44 Tape Reference Edge : The bottom edge of the tape when viewing the recording side of the tape, with the PEOT to the observers right. 4.45 Test Recording Current : The current that produces the Reference R
38、ecording Field. 4.46 track : A diagonally positioned area on the tape along which a series of magnetic signals may be recorded. 4.47 unprocessed data : Data which has not been subjected to processing. 4.48 Unprocessed Record : A record of unprocessed data, comprising an integral number of bytes. 4.4
39、9 Virtual End of Tape (VEOT) : The point along the length of the magnetic tape within partition 1 which defines the end of the part of partition 1 which is usable for recording data for interchange. 5 Environment and safety Unless otherwise stated, the conditions specified below refer to the ambient
40、 conditions of the air immediately surrounding the cartridge. 5.1 Testing environment Unless otherwise stated tests and measurements made on the tape cartridge to check the requirements of this International Standard shall be carried out under the following conditions: temperature : 23 “C + 2 “C rel
41、ative humidity : 40 % to 60 % conditioning period before testing : 24 h 5.2 Operating environment Cartridges used for data interchange shall be capable of operating under the following conditions: temperature :5”Cto45”C relative humidity : 20 % to 80 % wet bulb temperature : 26 “C max. There shall b
42、e no deposit of moisture on or in the cartridge. Conditioning before operating: If a cartridge has been exposed during storage and/or transportation to a condition outside the above values, before use the cartridge shall be conditioned in the operating environment for a time at least equal to the pe
43、riod during which it has been out of the operating environment, up to a maximum of 24 h. Note 6 - Rapid variations of temperature should be avoided. 5.3 Storage environment For long-term or archival storage of cartridges the following conditions shall be observed: temperature : 5 “C to 32 “C relativ
44、e humidity : 20 % to 60 % wet bulb temperature : 26 “C max. The stray magnetic field at any point on the tape shall not exceed 4 000 A/m. There shall be no deposit of moisture on or in the cartridge. 5.4 Transportation Recommended limits for the environment to which a cartridge may be subjected duri
45、ng transportation, and the precautions to be taken to minimize the possibility of damage, are provided in annex J. 5 Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/06/2007 22:55:43 MDTNo
46、reproduction or networking permitted without license from IHS -,-,- ISO/IEC 13923: 1996(E) 0 ISO/IEC 5.5 Safety The cartridge and its components shall satisfy the requirements of IEC 950. 5.6 Flammability The cartridge and its components shall be made from materials, which if ignited from a match fl
47、ame, do not continue to burn in a still carbon dioxide atmosphere. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/06/2007 22:55:43 MDTNo reproduction or networking permitted without licen
48、se from IHS -,-,- 0 ISO/IEC ISOIIEC 13923:1996(E) Section 2 - Requirements for the case 6 Dimensional and mechanical characteristics of the case 6.1 General The case of the cartridge shall comprise - an upper half, - a lower half, - a slider movably mounted on the lower half, - a lid pivotally mount
49、ed on the upper half. In the drawings, using third angle projection, an embodiment of the cartridge is shown as an example. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figures 19, 20 Figures 2 1, 22 Figure