The numbering system specified in GB/T 15133.1 and GB/T 15133.2 and GB/T 15134 provides conditions for all data exchanges between data processing systems. This standard specifies the quality of recorded signals, track configuration and track format for the above-mentioned floppy disks for data exchange between data processing systems. This standard is equivalent to ISO 5654/2-1985 "200mm dual-frequency single-sided floppy disks with a bit density of 13262 flux turns/radian and a track density of 1.9 tracks/mm for information processing data exchange Part 2: Track format". GB/T 15133.2-1994 200mm dual-frequency single-sided floppy disks with a bit density of 13262 flux turns/radian and a track density of 1.9 tracks/mm for information processing data exchange Part 2: Track format GB/T15133.2-1994 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 side-Part 2:Track format
1 Introduction
GB/T 15133.294
ISO 5654/2 -1985
GB/T 15133 specifies the performance of 200mm flexible disk cartridges using two-frequency recording at 13262ftprad, 1. 9tpmm,on one side. bzxZ.net
GB/T15133.1 specifies the dimensions, physical properties and magnetic properties of floppy disks. This provides the possibility of actual exchange between data processing systems.
GB/T15133.1 and the numbering system specified in GB/T15133.2 and GB/T15134 provide conditions for all data exchanges between data processing systems.
This standard specifies the quality of recorded signals, track configuration and track format for the above-mentioned floppy disks for data exchange between data processing systems.
This standard is equivalent to IS05654/2-1985 "200mm dual-frequency recording single-sided floppy disk with a bit density of 13262 flux reversals/radian and a track density of 1.9 tracks/mm for information processing data exchange Part 2: Track format". 2 Reference standards
GB1988 Information processing Seven-bit coded character set for information exchange GB2311 Information processing Code expansion technology for seven-bit and eight-bit coded character sets GB/T15133.1 Information processing Data exchange 200mm dual-frequency system recording bit density of 13262 flux reversals/radian, track density of 1.9 tracks/mm single-sided floppy disk Part 1: Dimensions, physical properties and magnetic properties GB/T15134 Information processing Floppy disk file structure and labeling for information exchange GB11383 Information processing Eight-bit code structure and encoding rules for information exchange 3 General recording requirements
3.1 Recording method
The recording method is dual-frequency system, and the beginning of each bit unit is a clock flux reversal. One data flux transition between two clock flux transitions represents \1".
3.2 Track position tolerance of recorded floppy disks State Technical Supervision Bureau 1994-07-16 approved 504
1995-03-01 implementation
GB/T 15133. 2—94
When measured under the test environment conditions specified in GB/T15133.1, the recorded track centerline should be within ±0.085mm of the nominal position. This tolerance is equivalent to twice the standard deviation. 3.3 Recording deviation angle
At the moment of writing or reading a flux reversal, the flux reversal can have an angle of 0°±18' with the radial direction. This tolerance is equivalent to twice the standard deviation.
3.4 ​​Recording density
3.4.1 The nominal recording density is 13262 flux reversals/arc degree, and the nominal spacing (nominal bit unit length) obtained between two clock flux reversals is 151 micro degrees.
3.4.2 The average bit unit length of the long item should be the average value of the bit unit length measured over the entire sector. It should be Within ±3% of the nominal bit cell length.
Note: Under special circumstances, a maximum deviation of ±5% in the computer power supply frequency is permitted. As long as the formatting of the floppy disk and the subsequent writing of data are not performed at the extremes of this range, data exchange may still be successful. 3.4.3 The average bit cell length of the short term (relative to a specific bit cell) shall be the average of the lengths of the 8 preceding bit cells. It shall be within ±8% of the average bit cell length of the long term. 3.5 Flux reversal spacing (see Figure 1)
The instantaneous spacing between flux reversals is affected by the reading and writing processes, the order of the recorded bits (pulse crowding effects) and other factors. The position of the reversal is defined as the position of the signal peak during readout. The test is performed using a peak sense amplifier [see Appendix B (reference). C
45% ~ 70%
90%~140%
45%~70%
90%~140%
60%~110%
3.5.1 The spacing between two clock flux flips containing one data flux flip or the spacing between two data flux flips containing one clock flux flip should be 90% to 140% of the nominal bit unit length. 3.5.2 The spacing between two clock flux flips without data flux flips or the spacing between two data flux flips is a leakage clock flux flip. The spacing between the data flux transitions and the preceding clock flux transitions (when there are no shortages) or the spacing between the clock flux transitions and the preceding data flux transitions (when there are no shortages) shall be 45% to 70% of the nominal bit unit length. 3.6 Average signal amplitude
The average signal amplitude on any defect-free track of a floppy disk for data exchange shall be less than 160% of the standard reference amplitude on track 00 and greater than 40% of the standard reference amplitude on track 76. 4 General format requirements
4.1 Bytes
A byte is a combination of 8 bit positions, identified by B, to B:, where B: is the most significant bit and is recorded first. The bit at each position should be "0\ or \1\.
4.2 Sectors
Each track is 26 sectors.
4.3 Data capacity of one track
The data capacity of one track is 3328 bytes.505
4.4 Hexadecimal notation
The following bytes are represented by hexadecimal notation: (00) represents (B:～B) = 00000000
(FF) represents (Ba～B,) = 11111111
(FC)* represents (B:～B) = 11111100
where B. and B. have no clock flip.
(FE)* represents (Bg～B)=11111110
where B., B. and B, have no clock flip. (FB)\ represents (Bg～B)=11111011
where B, B, and B have no clock flip. (F8)* represents (Bg～B,)=11111000
where B, Bs and B. have no clock flip. 4.5 Error Check Character (EDC)
GB/T 15133.2—94
Two EDC bytes are generated by hardware, that is, by serially shifting the relevant bits (see the following provisions for each part of the track) through a 16-bit shift register [see Appendix A (reference)], and its generating polynomial is: X16 + X12 + X5+ 1
4.6 Character representation
Characters should be represented by the seven-bit coded character set (GB1988), the expansion of the seven-bit coded character set (GB2311) or the eight-bit coded character set (national standard to be determined).
Each seven-bit coded character should be recorded in the position from B, to B, of a byte. The B bit should record "o". The relationship is shown in Table 1.
Bits of the seven-bit combination
Byte bit position
Each eight-bit coded character should be recorded in the position from B, to B, of a byte. The relationship is shown in Table 1. As shown in Table 2. Table 2
Bits of eight-bit combination
Byte bit position
4.7 Track allocation
Track 00 is used only as a label. Among the remaining 76 tracks, only 74 tracks can be used to record data, and the other one or two tracks may be defective tracks.
Track configuration after the first formatting
Track configuration after the first formatting is shown in Figure 2. 506
5.1 Index gap
Identifier
Identifier
GB/T 15133.2-94
Data block
1st sector
The index gap includes the following 73 bytes:
Data block
40 (FF) bytes, 6 (00) bytes, 1 (FC)* byte, 26 (FF) bytes. Will
Data block
Data block
26th sector
Writing the index gap starts when the index window is detected. Due to subsequent rewriting, any of the first 20 bytes may be uncertain. 5.2 Sector identifier
This field is shown in Table 3.
Identifier tag
6 bytes
5.2.1 Identifier tag
1 byte
This field includes 7 bytes:
a. 6 (00) bytes;
b. 1 (FE)* byte.
5.2.2 Address Identifier
This field consists of 6 bytes.
1 byte
2nd byte
1 byte
Address Identifier
1 byte
4th byte
1 byte
2 bytes
5.2.2.1 Track Address (T)
The track address is the first byte of the address identifier. It is represented in binary notation and is numbered sequentially from the outermost track 00 to the innermost track 74.
5.2.2.2 Second Byte of Address Identifier The second byte is always 1 (00) byte.
5.2.2.3 Sector Number (S)
The third byte represents the sector number in binary notation, which starts from 01 for the first sector and ends at 26 for the last sector. The 26 sectors are recorded in natural number order as: 1, 2.3+*****, 25, 26.
5.2.2.4 Fourth Byte of Address Identifier The fourth byte is always a (00) byte. 5.2.2.5 EDC
These two bytes shall be generated as specified in 4.5, using the sector identifier bytes starting from the (FE) byte of the identifier marker (see 5.2.1) and ending with the fourth byte of the address identifier (see 5.2.2.4). 5.3 Identifier Gap
This field shall consist of 11 initially recorded (FF) bytes. 5.4 Data Block
This field is shown in Table 4.
6 bytes
5.4.1 Data Tag
Data Tag
This field includes:
a. 6 (00) bytes;
b. 1 (FB)* byte.
5.4.2 Data Field
1 byte
GB/T15133.2—94
Data Field
128 bytes
2 bytes
This field includes 128 bytes. The content of this field (see 6.4.2) has no other requirements except the correct EDC. 5.4.3 EDC
These two bytes shall be generated as specified in 4.5, using the data block bytes starting from the seventh byte of the data tag (see 5.4.1) and ending with the last byte of the data field (see 5.4.2). 5.5 Data Block Gap
This field consists of 27 initially recorded (FF) bytes. It is recorded after each data block and before the next sector identifier. The data block gap after the last data block is located before the track gap. 5.6 Track Gap
This field should be immediately after the data block gap of the 26th sector. Write (FF) bytes until the index window is detected. Unless the index window is detected when the last data block gap is written, there should be no track gap. 6 Track Configuration of Good Tracks on a Floppy Disk for Data Interchange 6. 1 Index Gap
See 5.1 for description.
6.2 Sector Identifier
6.2.1 Identifier Tag
See 5.2.1 for description.
6.2.2 Address Identifier
See 5.2.2 for description.
6.2.2.1 Track Address (T)
The track address is the first byte of the address identifier. It is represented in binary notation and is numbered sequentially from the outermost track 00 to the innermost track 74.
Note: Each track has a unique track number. Two of these tracks can only be used when one or two defective tracks are present. Each good track occupies a unique track address; defective tracks do not occupy track addresses. The track addresses for good tracks are given consecutively in the order of increasing track numbers. 6.2.2.2 The second byte of the address identifier is described in 5.2.2.2.
6.2.2.3 Sector Number (S)
The third byte represents the sector number in binary notation, which is from 01 for the first sector to 26 for the last sector. Note: ① The columns of Table 5 are represented by two digits from 01 to 13. GB/T15134 specifies an area called "sector sequence indicator", which uses the 77th to 78th position of the volume label VOL.1. In the table, these two digits indicate the order of recording sectors.② The vertical columns in the table are the positions of the sector numbers on the track. For example, in column 08, the first sector of the track is sector number 01, followed by sector number 09, the third is sector number 17, and so on until the 26th sector is sector number 24.6.2.2.4 The fourth byte of the address identifier 508
See 5.2.2.4 for an explanation.
Position of sectors on the track
GB/T 15133. 2—94
Table 5 Sequence of sector numbers on tracks
Note: After the first formatting, sectors are recorded in natural number order. However, reformatting is required when using the other 12 sequence numbers. 6.2.2.5 EDC
For explanation, see 5.2.2.5.
6.3 Identifier gap
This field includes 11 initially recorded (FF) bytes. Due to subsequent overwriting, these bytes may become indeterminate. 6.4 Data block
6.4.1 Data tag
This field includes:
a. 6 (00) bytes;
b. 1 byte.
GB/T 15133. 2--94
The seventh byte should be one of the following two bytes: (FB) indicates that the data is valid and the entire data field can be read; (F8)\ indicates that only the first byte of the data field can be read and interpreted according to GB/T15134. 6.4.2 Data field
This field consists of 128 bytes. If it is less than 128 bytes, the remaining part is padded with (00) bytes. The data field of track (00) is used for operating system and label. 6.4.3 EDC
See 5.4.3 for explanation.
When the sector contains a defective area, if the seventh byte of the data mark is (F8)", and the first character of the data field is capital F, the EDC may be correct or incorrect. If the first character is capital D, the EDC should be correct.
Only capital D is allowed on track 00. 6.5 Data Block Gap
This field is recorded after each data block and before the next sector identifier. The data block gap after the last data block is before the track gap.
It consists of 27 (FF) bytes recorded initially (see 5.5). These bytes may become uncertain due to subsequent rewriting. 6.6 Track Gap
See 5.6 for explanation.
7 Track Configuration of Bad Tracks on Floppy Disks for Data Interchange These fields of bad tracks should be rewritten with the following contents. 7.1 Index Gap
This field consists of 73 (FF) bytes. 7.2 Sector Identifier
This field consists of 1 Identifier Tag and 1 Address Identifier. 7.2.1 Identifier Tag
This field consists of 7 bytes.
Spot. 6 (00) bytes;
b. 1 (FE)\ byte.
7.2.2 Address Identifier
This field consists of 6 bytes:
a. 4 (FF) bytes,
b. 2 EDC bytes.
These two EDC bytes shall be generated as specified in 4.5, using the sector identifier bytes starting from the (FE)* byte of the identifier marker (see 7.2.1) and ending with the above 4 (FF) bytes. 7.3 Identifier Gap
This field consists of 11 (FF) bytes.
7.4 Data Block
7.4.1 Data Tag
This field consists of 7 (FF) bytes.
7.4.2 Data Field
This field consists of 128 (FF) bytes.
7.5 Data Block Interval
This field consists of 27 (FF) bytes.
7.6 Track Gap
For explanation, see 5.6.
7.7 Requirements for Bad Tracks
GB/T15133.2—94
At least one of the sector identifiers of a bad track has the content specified in 7.2. If this condition is not met, the diskette shall be rejected. All other fields of these tracks may be indeterminate. 511
GB/T15133.2-—94
Appendix A
Execution of EDC
(Reference)
Figure A1 is a feedback connection diagram of the shift register that can be used to generate the EDC byte. Before operation, all bits of the shift register are set to "1". The input data is added (XOR) to the value stored in C15 of the register to form feedback. This feedback signal is added (XOR) to the values ​​stored in C and Cu again. During shifting, the output of the XOR gate is sent to Co, C, and C12 respectively. When the last data bit is added, the register is shifted once again according to the above regulations.
At this time, the register stores the EDC byte.
If the register is still shifting when the EDC byte is written, the XOR operation is prohibited by the control signal. In order to detect whether there is an error when reading, the data bits should be added to the shift register in exactly the same way as when writing. After the data is input, the EDC byte is also sent to the shift register as data. After the last shift, the shift register will contain all o\ as long as the record is correct.
Write EDC
Appendix B
Procedure and equipment for measuring flux reversal spacing (reference)
B1 General description
This appendix specifies the procedure and equipment for measuring flux reversal spacing on a 200mm double-frequency recorded single-sided floppy disk with a density of 13262 flux reversals/radian.
The disk to be tested should be written by a disk drive used for data exchange. Tests are performed on tracks 00, 43, 44 and 76. The write current is selected in accordance with GB/T15133.1. The pattern codes 00100000 (20) and 11101111 (EF) are written on each track to be tested. B3 Test Equipment
B3.1 Disk Drive
During the entire rotation, the average rotation speed of the disk drive shall be 360±3r/min. The average angular velocity within 32μs shall not exceed 0.5% of the average velocity during the entire rotation.
B3.2 Head
B3.2.1 Resolution
GB/T 15133.2—94
When a reference floppy disk (RM5654) with known correction coefficients and a specified test record current record is used, the absolute resolution of the head on 76 tracks shall be 55% to 65%.
The resonance rate of the head shall not be less than 500000Hz. The resolution cannot be changed by changing the head load impedance. The resolution shall be measured at the amplifier output terminal specified in B3.3.1. B3.2.2 Deviation Angle
In the drive under test, the head is allowed to have a deviation angle of 0°±6' in the radial direction of the disk. B3.2.3 Contact
During the media test, the head and the media should be in good contact. B3.3 Read Circuit
B3.3.1 Read Amplifier
The read amplifier should have a smooth response curve of no more than ±1dB in the frequency band from 1000Hz to 375000Hz, and no amplitude saturation.
B3.3.2 Peak Read Amplifier
Peak reading is measured with a differential and limiting amplifier. B3.4 Equipment for measuring time intervals
The time interval counter can measure time intervals from 2ps to a minimum of 5ns. It can be measured with a pulse oscilloscope. B4 Measurement Procedure
B4.1 Measurement of Flux Reversal Spacing
The flux reversal position should be measured at the peak of the signal readout. The flux reversal interval shall be measured by the pulse time interval measured by the read channel amplifier specified in B3.3.
B4.2 Flux reversal interval
Measured time interval t to t: as shown in Figure B1. 3.5.1 corresponds to t and t2, 3.5.2 corresponds to t4, 3.5.3 corresponds to t5, tgvt, and tgo
Additional instructions:
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is reviewed by the National Technical Committee for Computer and Information Processing Standardization. This standard is drafted by the 33rd Institute of the Ministry of Electronics Industry. The main drafters of this standard are Dong Chengju, Li Guixin, Liu Jinying, Wang Dalan, and Zheng Hongren. 5131 Reading amplifier
The reading amplifier should have a smooth response curve of no more than ±1dB in the frequency band from 1000Hz to 375000Hz, and no amplitude saturation.
B3.3.2 Peak value reading amplifier
The peak reading is measured with a differential and limiting amplifier. B3.4 Equipment for measuring time intervals
The time interval counter can measure time intervals from 2ps to a minimum of 5ns. It can be measured with a pulse oscilloscope. B4 Measurement steps
B4.1 Measurement of flux reversal spacing
The flux reversal position should be measured at the signal readout peak. The flux reversal spacing should be measured by the pulse time interval measured by the reading channel amplifier specified in B3.3.
B4.2 Flux reversal spacing
The time interval t to t is measured: as shown in Figure B1. 3.5.1 corresponds to t and t2, 3.5.2 corresponds to t4, 3.5.3 corresponds to t5, tgvt, and tgo
Additional Notes:
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is reviewed by the National Technical Committee for Computer and Information Processing Standardization. This standard is drafted by the 33rd Institute of the Ministry of Electronics Industry. The main drafters of this standard are Dong Chengju, Li Guixin, Liu Jinying, Wang Dalan, and Zheng Hongren. 5131 Reading amplifier
The reading amplifier should have a smooth response curve of no more than ±1dB in the frequency band from 1000Hz to 375000Hz, and no amplitude saturation.
B3.3.2 Peak value reading amplifier
The peak reading is measured with a differential and limiting amplifier. B3.4 Equipment for measuring time intervals
The time interval counter can measure time intervals from 2ps to a minimum of 5ns. It can be measured with a pulse oscilloscope. B4 Measurement steps
B4.1 Measurement of flux reversal spacing
The flux reversal position should be measured at the signal readout peak. The flux reversal spacing should be measured by the pulse time interval measured by the reading channel amplifier specified in B3.3.
B4.2 Flux reversal spacing
The time interval t to t is measured: as shown in Figure B1. 3.5.1 corresponds to t and t2, 3.5.2 corresponds to t4, 3.5.3 corresponds to t5, tgvt, and tgo
Additional Notes:
This standard is proposed by the Ministry of Electronics Industry of the People's Republic of China. This standard is reviewed by the National Technical Committee for Computer and Information Processing Standardization. This standard is drafted by the 33rd Institute of the Ministry of Electronics Industry. The main drafters of this standard are Dong Chengju, Li Guixin, Liu Jinying, Wang Dalan, and Zheng Hongren. 513
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