The numbering system specified in GB/T 15132.1 and GB/T 15132.2 and GB/T 15134 provides conditions for all data exchanges between data processing systems. This standard specifies the dimensions, physical properties and magnetic properties of the above-mentioned floppy disks to ensure the actual interchangeability between data processing systems. This standard is equivalent to ISO 6596/1-1985 "Information processing-130mm dual-frequency recording single-sided floppy disks with a bit density of 7958 flux reversals/radian and a track density of 1.9 tracks/mm for data exchange Part 1: Dimensions, physical properties and magnetic properties". GB/T 15132.1-1994 130 mm dual-frequency recording single-sided floppy disks with a bit density of 7958 flux reversals/radian and a track density of 1.9 tracks/mm for information processing data exchange Part 1: Dimensions, physical properties and magnetic properties GB/T15132.1-1994 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Information processing-Data interchange on 130mmflexible disk cartridges using two-frequency recording at 7958ftprad, 1. 9tpmm,on one side-Part 1 : Dimensional ,physical and magnetic characteristics
1 Introduction
GB/T 15132. 1-94
ISO 6596/1-1985
GB/T15132 specifies the properties of 130mm flexible disk cartridges using two-frequency recording at 7958ftprad, 1. 9tpmm,on one side.
GB/T15132.2 specifies the quality of recorded signals, track configuration and track format. The numbering system specified in GB/T15132.1 and GB/T15132.2 and GB/T15134 provides conditions for all data exchanges between data processing systems.
This standard specifies the dimensions, physical properties and magnetic properties of the above-mentioned floppy disks to ensure practical interchangeability between data processing systems. This standard is equivalent to ISO6596/1-1985 "Information Processing-130mm dual-frequency recording single-sided floppy disks with a bit density of 7958 flux reversals/radian and a track density of 1.9 tracks/mm for data exchange Part 1: Dimensions, physical properties and magnetic properties". 2 Reference standards
GB1988 Information Processing Information Interchange Seven-bit Coded Character Set GB2311 Information Processing Seven-bit and Eight-bit Coded Character Set Code Extension Technology GB/T15134 Information Processing Information Interchange Floppy Disk File Structure and Label GB11383-89 Information Processing Information Interchange Eight-bit Code Structure and Coding Rules 3 Terminology
This standard uses the following terms.
3.1 Disk: A disk is a component that receives and holds magnetic signals on a specific single or double surface, and is used for input/output and storage of information in information data processing and related systems
3.2 Reference floppy disk: A floppy disk with known characteristics selected arbitrarily for calibration. 3.3 Secondary reference floppy disk: A floppy disk with known characteristics calibrated by a reference floppy disk and used for routine calibration. 3.4 Information Amplitude Reference Floppy Disk: A reference floppy disk selected as a standard for recording magnetic field strength and signal amplitude. 3.5 Typical magnetic field strength: The minimum magnetic field strength when the signal output generated by applying it to the specified track of the floppy disk is equal to 95% of the maximum average signal amplitude when recording at the specified flux reversal frequency. Approved by the State Administration of Technical Supervision on July 16, 1994 and implemented on March 1, 1995
GB/T 15132.1-94
3.6 Reference magnetic field strength: The typical magnetic field strength of the signal amplitude reference floppy disk. 3.7 Test recording current: When recording at a frequency of 125,000 flux reversals/second on the 00 track, its magnitude is equivalent to 145% to 155% of the current generating the reference magnetic field strength.
3.8 Standard reference amplitude, when recording at a frequency of 125,000 flux reversals/second and 250,000 flux reversals/second on the 00 track and 34 track respectively, the average signal amplitude obtained from the signal amplitude reference floppy disk with the corresponding test recording current (see 8.2). 3.9 Average signal amplitude: the arithmetic mean of the peak-to-peak output voltage measured on the entire track. 3.10 Contact recording: during operation, the magnetic surface of the disk is in actual contact with the head. 3.11 Formatting: writing unique control information on the disk surface, and determining the 35 actual tracks and actual recording addresses according to the control information. 3.12 Initialization: the operation of writing the volume label, error map label (ERMAP) and other required information on the floppy disk in advance before general data processing and use. 3.13 Recording area: the area where the head can contact the disk surface. 4
General description
4.1. General diagram
A typical floppy disk is shown in Figures 1 to 3. Figure 1 is a top view of the floppy disk, with side 0 facing upward. Figure 2 is a cross-sectional view along the A-A cross section of Figure 1. b.
Figure 3 is a protective jacket containing a floppy disk, with side 1 facing upward. 4.2 Main components
The main components of a floppy disk are:
recording disk,
lining,
cover.
The floppy disk is placed in the cover.
Center seal
Primary index seal
Figure 1 Floppy disk
Magnetic head opening
4.3 Description
GB/T 15132.1-94
2229299992229
Figure 2A-A cross-sectional view
Figure 3 Protective cover with floppy disk
Marking area
The cover is square, with a center window, an index window and a magnetic head window on both sides. The lining is fixed to the inner surface of the cover. It has two layers, with the disk in between, and the lining and the cover have the same windows. The disk has only one center window and one index window. 4.4 Optional appearance structure
The interchangeability of the cover allows some changes in its structure. It can have folded edges (three folded edges as shown in the figure, or no folded edges); it can also have notches on the reference edge.
5 General requirements
5.1 Environment and transportation
5.1.1 Test environment
In order to verify whether the floppy disk meets the requirements of this standard, the test and measurement should be carried out under the following conditions: a.
Temperature: 23±2℃;
Relative humidity: 40%～60%;
Pre-test adaptation: at least 24h.
GB/T 15132.1—94
The measurement of temperature and relative humidity should be carried out in the surrounding air closest to the floppy disk. The stray magnetic field strength at any point on the disk surface, including the combined influence from the recording head, should not exceed 4000A/m. 5.1.2 Usage Environment
Floppy disks for data exchange should be used under the following conditions: a.
Temperature: 10~51.5℃;
Relative humidity: 20%~80%;
Wet bulb temperature: less than 29℃.
Temperature and relative humidity should be measured in the surrounding air closest to the floppy disk. It is recommended that the temperature change rate should not exceed 20℃/h.
No moisture should be attached to or inside the floppy disk. The stray magnetic field strength at any point on the disk surface, including the combined effect from the recording head, should not exceed 4000A/m. 5.1.3 Storage Environment
During storage, it is recommended that the floppy disk be kept under the following conditions: Temperature: 4~51.5℃;
Relative humidity: 8%~80%.
Each floppy disk should be placed in a jacket and placed upright. The surrounding stray magnetic field strength should not exceed 4000A/m. Note: When the floppy disk is exposed to temperatures and humidity exceeding the use environment, its performance may be reduced. Such floppy disks should be acclimatized in the use environment for no less than 24 hours before use.
5.1.4 Transportation
The consignor is responsible for taking measures to ensure that the floppy disk is not damaged during transportation. The floppy disk should be placed in the outer jacket and placed in a protective package together with the outer jacket. The packaging box should be free of dust and debris, the inner surface should be clean, and dust and water proof. There should be enough space between the floppy disk and the outer surface of the outer packaging box so that the damage to the floppy disk by various stray magnetic fields is negligible. It is recommended not to exceed the following conditions:
Temperature: -40~～51.5℃;
Maximum temperature change rate: 20℃/h,
Relative humidity: 8%~90%.
No water droplets should condense inside or on the floppy disk. 5.1.5 Maintenance
The floppy disk should be placed out of the jacket for as short a time as possible. When using a floppy disk, the operator should not touch the magnetic surface of the disk and should avoid direct exposure to sunlight, moisture and dust. 5.2 Materials
5.2.1 Cover
The cover can be made of any suitable material. 5.2.2 Lining
The material of the lining should be able to block dust without damaging the disk. 5.2.3 Disk
Material made of magnetic material (such as Y-Fe2O.) made of magnetic slurry, coated on any suitable material (such as biaxially oriented polyethylene terephthalate).
5.2.4 Outer jacket
The outer jacket can be made of any suitable material (such as paper). 5.3 Direction of rotation
GB/T 15132. 1--94
Looking at the 0 side of the cover, the disk should rotate counterclockwise. 6 Structural dimensions
The structural dimensions listed in the following clauses are shown in Figures 4 to 7. Figure 4 is the enclosure dimensions;
Figure 5 is a partial cross-sectional view of the enclosure;
Figure 6 is the disk dimensions;
Figure 7 is a cross-sectional view of the disk.
All dimensions are based on the reference edge of the enclosure (see Figure 4). 6.1 Enclosure
6.1.1 Shape
The enclosure is square with four corners of 90°±30″; the side length is: =133.3±0.4mm
6.1.2 Thickness
6.1.2.1 The enclosure wall and lining
should be within the area specified by and r2, where: r=35mm
rz=50mm
and when a force of 1N is applied to the floppy disk with a gauge of 15mm diameter, the thickness of the enclosure wall and lining should be: e=0.45±0.15mm
6.1.2.2 Floppy diskwww.bzxz.net
The total thickness of the floppy disk should be (see 6.1.7): 1.2mm
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