The numbering system specified in GB/T15133.1 and GB/T 15133.2 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 5654/1-1984 "Information processing-200mm dual-frequency recording single-sided floppy disks with a bit density of 13262 flux turns/radian and a track density of 1.9 tracks/mm for data exchange Part 1: Dimensions, physical properties and magnetic properties". GB/T 15133.1-1994 200 mm dual-frequency recording single-sided floppy disks with a bit density of 13262 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/T15133.1-1994 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Information processing-Data interchange on 200mmflexible disk cartridges using two-frequency recording at 13262ftprad,1. 9tpmm ,on one sidePart 1 : Dimensional , physical and magnetic characteristics1 Introduction
GB/T15133.1—94
ISO 5654/1 - 1984
GB/T15133 specifies the properties of 200mmflexible disk cartridges using two-frequency recording at 13262ftprad,1. 9tpmm ,on one side
GB/T15133.2 specifies the quality of recorded signals, track configuration and track format. The numbering system specified in GB/T15133.1 and GB/T15133.2 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 ISO5654/1-1984 "Information processing-200mm dual-frequency recording single-sided floppy disks with a bit density of 13262 flux reversals/arc 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 Seven-bit coded character set for information exchange GB2311 Information processing Seven-bit and eight-bit coded character set code expansion technology GB11383 Information processing Eight-bit code structure and encoding rules for information exchange GB/T15134 Information processing Floppy disk file structure and labeling for information exchange 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 side, 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 Signal 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 designated 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 National Technical Supervision Bureau on July 16, 1994 488
Implementation on March 1, 1995
GB/T15133.1~-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 250,000 flux reversals/second on track 00 and track 76, two currents of magnitude are equivalent to 145%~155% of the current generating the reference magnetic field strength, of which the first current is used to record tracks 00 to 43, and the second current is used to record tracks 44 to 76 (see 8.2). 3.8 Standard reference amplitude: The average signal amplitude obtained from the signal amplitude reference floppy disk when recording at a frequency of 250,000 flux reversals/second and 500,000 flux reversals/second on track 00 and track 76, respectively, with the test recording current corresponding to the track (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 and the head are in actual contact. 3.11 Formatting: Writing unique control information on the disk surface, determining the 77 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. General description
4.1 General drawing
A typical floppy disk is shown in Figures 1 to 3: Figure 1 is a top view of a 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. Index window
Center window
Floppy disk
Figure 2A-A cross-sectional view
Head window
4.2 Main components
The main components of a floppy disk are:
Recording disk:
b. Liner;
Sealing wing.
The floppy disk is placed in the jacket.
4.3 Explanation
GB/T 15133. 1-94
Figure 3 Protective cover with floppy disk
Label area
The cover is square and has a center window, an index window and a head window on both sides. The liner is fixed to the inner surface of the cover. It has two layers, with the disk located between them. The liner 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 Figure 1, or no folded edges); it can also have notches on the reference edge. In some cases, a write-inhibiting notch can be used, see Appendix D. 5 General requirements
5.1 Environment and transportation
5.1.1 Test environment
To verify whether the floppy disk meets the requirements of this standard, the test and measurement should be carried out under the following conditions: Temperature: 23±2℃,
Relative humidity: 40%60%;
Adaptation before test: at least 24h.
The temperature and relative humidity should be measured in the surrounding air closest to the floppy disk. The stray magnetic field intensity at any point on the disk surface, including the combined influence from the recording head, should not exceed 4000A/m. 5.1.2 Use environment
The floppy disk used for data exchange should be used under the following conditions: 490wwW.bzxz.Net
Temperature: 10～51.5℃;
b.Relative humidity: 20%～80%;
Wet bulb temperature: less than 29℃.
GB/T15133.1—94
The 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℃;
b. 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 temperature and humidity beyond 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 resistant. There should be enough space between the floppy disk and the outer surface of the outer packaging box to make the damage to the disk by various stray magnetic fields negligible. It is recommended not to exceed the following conditions:
a 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 the floppy disk, the operator should not touch the magnetic surface of the disk and avoid direct exposure to sunlight, moisture and dust. 5.2 Materials
5.2.1 Enclosure
The enclosure can be made of any suitable material. 5.2.2 Lining
The lining material should be able to block dust without damaging the disk. 5.2.3 Disk
It is made of magnetic material (such as Fe2O3) made of magnetic slurry, coated on any suitable material (such as biaxially oriented polyethylene terephthalate).
5.2.4 Jacket
The jacket can be made of any suitable material (such as paper). 5.3 Direction of rotation
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. a. Figure 4 is the size of the cover;
Figure 5 is a partial cross-sectional view of the cover;
Figure 6 is the size of the disk;
Figure 7 is a cross-sectional view of the disk.
GB/T 15133. 1—94
All dimensions are based on the reference edge of the cover (see Figure 4). 6.1 Enclosure
6.1.1 Shape
The enclosure is square, with four corners of 90°±30° and side lengths of: lj=203.2±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,=60mm
rz=85mm
and a gauge with a diameter of 15mm is applied to the floppy disk. N of force, the thickness of the enclosure wall and lining is: ei=0.45±0.15mm
Figure 4 Enclosure size
Benchmark
6.1.2.2 Floppy disk
GB/T15133.1—94
Thickness of floppy disk
Figure 6 Disk size
Figure 7 Disk thickness
Figure 8 Pressure pad area
The total thickness of the floppy disk should be (also refer to 6.1.7): 1.2mm
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