GB 2949-1982 Magnetic properties of six-disc interchangeable disk packs
Some standard content:
National Standard of the People's Republic of China
Magnetic characteristics of imterchangeablemagnetic six -disk pack.
UDC681.327.63
GB 2949-82
This standard makes necessary provisions for the magnetic properties of the six-disk interchangeable disk pack (hereinafter referred to as the disk pack) in order to ensure the interchangeability of the disk pack. All general and mechanical properties of the disk pack shall comply with the provisions of GB2309-80 "Mechanical properties of eight-disk interchangeable disk pack".
This standard is only applicable to six-disk interchangeable disk packs with a bit density of 44 bits/mm and a track density of 4 tracks/m for data processing systems. This standard is formulated with reference to the International Organization for Standardization standard I5O2864-1974 "Magnetic properties of six-disk interchangeable disk packs".
Configuration of recording surface and magnetic head
- Mechanical properties and magnetic properties>
Ten recording surfaces and corresponding magnetic heads are numbered in order from top to bottom, and their configuration is shown in Figure 1 and Table 1. cc
B skull
A magnetic head
Disk group rotation force
Protection disk
Index disk
Figure 1 Schematic diagram of configuration of recording surface and magnetic head
National Standards Bureau 1982-03-29 Issued 1983-01-01 Implementation
(Magnetic head or recording two)
GB2949--B2
Clothes 1 Configuration of magnetic head and recording surface
Magnetic head square
B-U
Note; "" in Table 1 means that the floating surface of the magnetic head is upward, and "D" means that the floating surface of the magnetic head is downward. 2 Track geometry parameters
2.1 Number of tracks
Each recording surface should have 203 screen-centered circular tracks of different radii. 2.2 Track width
After tunnel erasure, the recorded track width of the disk F: should be 0.140±0.013mm. The area between the tracks should be erased. A method for measuring the effective track width is recommended in Appendix A. 2.3 Track position
2.3.1 Nominal position
The nominal values of the centerline radius of each track calculated according to the geometry of the head-disk system in Figure 2 and the relevant number of bands are listed in Table 2. At 23 (, its related dimensional constants are specified as follows.
Head displacement increment:
S=0.2567mmbzxZ.net
Output head
Make it write
Gap access line
R head slider
Increase base S
"Disk rotation direction
A head
A head
Chain tunnel access line
Read and write gap
Bear track bead gap removal
[A head slider
Figure 2 Geometry of head disk system
Offset distance of head working gap:
FA=10.861mmg
F = 11.999mm.
73The radius of the center line:
Rz3 = 146.507mm.
Head deflection angle:
# = 4°54'.
Track number
A head track radius
No. 16, 432
163,664
163,407
161,871
161,615
161,358
160,59 0
160,078
159,566
158,541
158,285
157,261
157,005
156,237
155,980
GB 2949—82
Table 2 Nominal values of track radius
B Head track radius
164,678
164,166
163,910
163,654
163,398
162,886
162,374
160,070
159,814
159,046
158,535
158,279
158,0 23
157,767
157,511
156,743
156,487
155,719
Track number
A head track radius
154,95 6
154,444
154,188
153,932
153,420
153,164
152,652
152,396
152, 140
t51,884
151,627
151,371
150,859
150,091
14h,811
148,043
147, 531
147,019
146,763
145,483
145,227
B head track radius
154,951
154,693
153,4 16
153,160
152,648
152,342
151,624
149,577
148,810
148,554
148,04 2
147,275
145,995
145,740
145,228
144,972
Track number
A magnetic track radius
144,715||tt ||144,459
144,203
143,947
143,691
142,156
141,900
141,644
141,132||tt ||140,876
140,364
139,852
139,084
138,829
138,317
138,061
137,293||tt| |136,525
136,270
136,014
135,758
135,502
134,990
134,479
134,223
133967 | 949
143,693
143,437
143,182
142,670
142,414
141,903||tt| |141,135
140,886
140,624
139,345
139,089
138,834
138,578| |tt||139,322
138,066
137,811
136,788
135,765
135,254
134, 487
133,719
133,464
Track number
A head track radius
132,432
131,920
131, 664
130,897
1301,385
130,129
129,106
126,548
126,037
125,270
125,014
124,503
1 23991
123735
123,480
122,968
122,457
122,201
121,434
B Head track radius
132,697
131,980
181,674
131,419
131,163
130,907||tt| |130,141
129,629
129,374
129,118
128,863
128,607
128,351||t t||128,095
127,585
127,329
127,074
126,563
126,052
125,796| |tt||125,540
123,752
123,495
122,985
122,730
122,457
122,21 9
121,964
121,453
120,942
Track number
A Head track radius
120,667
119,389||tt ||119,133
118,878
118,622
118,111
117,600
2.8.2 Track position tolerance
GB 2949--82
Continued Table 2
B head track radius
120,686
120,431
119 ,920
119,409
119,164
118,899
118,643
118, 132
117,366
Track number
A head track radius
116,577
116,322
115,300
114,022||tt ||B head track radius
116,090
115,834
115,579
115,324
111,813
113,792
at 23°C When measuring the centerline of the magnetic track, the deviation of the measured position of the recorded track centerline from the nominal position should be within 0.025mm. At other temperatures (within the range specified in GB2309-80), the nominal position of the track centerline can be calculated using the linear expansion coefficient of 24×10-/℃.
2.a.3 Recording deflection angle| |tt||At the moment of writing or reading, the angle between the magnetization reversal and the head access line specified in Figure 2 is 4°54°±30°. 2.4 Marking
Use the following markings for testing
2.4.1 Track Mark
The track mark is represented by a three-digit decimal number (000 to 202). Each recording surface is numbered sequentially from the outermost track to the inner side. 2.4.2 Recording Surface As shown in FIG1, the ten recording surfaces are numbered sequentially using two-digit decimal numbers (00 to 09) starting from the bottom surface of the top recording disk.
2.4.3 Cylinder Address
All tracks with the same track number in a disk group form a cylinder. The cylinder address is the track number. 2.4.4 Track Address
Use A five-digit decimal number represents a track address, where the three high-order digits determine the cylinder address and the remaining digit determines the record address (the record surface address is the record surface mark number). The starting and ending points of the track. At the moment when the leading edge of the index notch X of the index disk is detected, the index stop is directly below the reading gap of the magnetic head (A head and B head, see Figure 3) on the corresponding access line. . At this time, the angle between the access radial centerline and the radius through the leading edge of the index notch X (see Figure 3) should be: = 69°0'54\
2.8 Test area||tt| |2.6.1 Title area
Radial center line
GB2949—82
B Head talk/write
Seam mouse storage line
A Header read/write
Key gap access line
Disk center
Figure 3 Track index
Primary gap
For testing, the header area is specified The area is: when the disk group rotation speed is 2400 rpm, it starts no later than 100 μs after the index and ends no earlier than 700 μs after the next index.
2.6.2 Data Area
For testing purposes, the data area is defined as: when the disk group speed is 2400rpm, it starts no later than 700μs after the prime and continues to the next prime.
3 Test conditions and equipment
3.1 General conditions
3.1.1 Rotation speed
During any test, the disk group rotation speed should be 2400±24rpm, the rotation direction It should be counterclockwise (looking down). 3.1.2 Temperature
The temperature of the air entering the panel group should be 27±1℃. 8.1.3 Relative humidity
The relative humidity of the air entering the panel group should be 40% to 60%. 3.1.4 Adaptation time
Before testing, the disk group and the test device should adapt to the same environment for 24 hours. 8.2 Standard reference surface
Standard reference surface Serves as the basis for calibration of all secondary standards. The standard reference surface is stored in a designated institution. 3.2.1 Characteristics of the standard reference surface
The standard reference surface is characterized by the area indicated by the notch. And the area is defined as the period from 50us to 275μs after the notch edge. Q. When using the test head (see 3.3) to read the mountain, the reference surface should give the following average output voltage (see 3.4.2 for the specifications of 1f and 2f frequencies): Track 2001f7.5mV,
Track 200: 2f
Track 0001f11.9mV.
These voltage values are the peak-to-peak values measured after tunnel erasure recording. 3.2.2 Secondary standard reference plane
GB 2949—82| |tt||The output voltage of the secondary standard reference plane is related to the output voltage of the standard reference plane, and the relationship is expressed by the correction coefficient CD. The correction coefficient C is:
standard reference plane output voltage
secondary standard reference plane output voltage
The correction coefficient Cn of the qualified secondary standard reference plane should meet 0.90453
120,942
Track number
A Head track radius
120,667
119,389
119,133
118,878
118,622
118,111
117,600
2.8.2 Track position tolerance
GB 2949--82
Continued Table 2
B head track radius
120,686
120,431
119 ,920
119,409
119,164
118,899
118,643
118, 132
117,366
Track number
A head track radius
116,577
116,322
115,300
114,022
B head track radius
116,090
115,834
115,579
115,324
111,813
113,792
At 23°C, the deviation of the measured position of the recorded track centerline from the nominal position should be within 0.025mm. At other temperatures (within the range specified in GB2309-80), the nominal position of the center line of the track can be calculated using the linear expansion coefficient of 24×10-/℃.
2.a.3 Recording deflection angle
At the moment of writing or reading, the angle between the magnetization reversal and the head access line specified in Figure 2 is 4°54°±30°. 2.4 Marking
The following markings are used for testing.
2.4.1 Track marking
The track marking is represented by a three-digit decimal number (000~202). Each recording surface is numbered sequentially from the outermost track to the inside. 2.4.2 Recording surface marking
As shown in Figure 1, the ten recording surfaces are numbered sequentially starting from the lower surface of the top recording disk with a two-digit decimal number (00~09).
2.4.3 Cylinder address
All tracks with the same track mark number in the disk group form a cylinder. The cylinder address is the track mark number. 2.4.4 Track address
A track address is represented by a five-digit decimal number, of which the three high-order digits determine the cylinder address and the remaining one digit determines the record address (the record surface address is the record surface mark number). 2.5 Index
The index is the point that determines the start and end of the track. At the moment when the leading edge of the index notch X of the index disk is detected, the index is located directly below the read gap of the magnetic head (A head and B head, see Figure 3) on the corresponding access line. At this time, the angle between the access radial center line and the radius passing through the leading edge of the index notch X (see Figure 3) should be: = 69°0'54\
2.8 Test area
2.6.1 Header area
Radial center line
GB2949—82
B Head talk/write
Access line
A Head read/write
Access line
Disk center
Figure 3 Track index
Index notch
For testing, the header area is defined as the area starting no later than 100μs after indexing and ending no earlier than 700μs after indexing when the disk assembly rotation speed is 2400rpm.
2.6.2 Data area
For the purpose of testing, the data area is defined as: when the disk group speed is 2400rpm, it starts no later than 700μs after the prime and continues to the area between the next cables.
3 Test conditions and equipment
3.1 General conditions
3.1.1 Speed
During any test, the disk group speed should be 2400±24rpm, and the rotation direction should be counterclockwise (looking down). 3,1.2 Temperature
The temperature of the air entering the disk group should be 27±1℃. 8.1.3 Relative humidity
The relative humidity of the air entering the disk group should be 40%~60%. 3.1.4 Acclimation time
Before testing, the disk group should be acclimated to the same environment as the test equipment for 24 hours. 8.2 Standard reference surface
The standard reference surface is used as the reference for calibrating all secondary standards. The standard reference surface is stored in a designated institution. 3.2.1 Characteristics of the standard reference surface
The standard reference surface is characterized by the area indicated by the notch. And the area is defined as the period from 50us to 275μs after the notch edge. When reading the mountain using the test head (see 3.3), the reference surface should give the following average output voltage (the definition of 1f and 2f frequencies is shown in 3.4.2): Track 2001f7.5mV,
Track 200:2f
Track 0001f11.9mV.
These voltage values are the peak-to-peak values measured after tunnel erasure recording. 3.2.2 Secondary standard reference surface
GB 2949-82
The output voltage of the secondary standard reference surface is related to the output voltage of the standard reference surface, and the relationship is expressed by the correction coefficient CD. The correction coefficient C is:
standard reference plane output voltage
secondary standard reference plane output voltage
The correction coefficient Cn of the qualified secondary standard reference plane should meet 0.90453
120,942
Track number
A Head track radius
120,667
119,389
119,133
118,878
118,622
118,111
117,600
2.8.2 Track position tolerance
GB 2949--82
Continued Table 2
B head track radius
120,686
120,431
119 ,920
119,409
119,164
118,899
118,643
118, 132
117,366
Track number
A head track radius
116,577
116,322
115,300
114,022
B head track radius
116,090
115,834
115,579
115,324
111,813
113,792
At 23°C, the deviation of the measured position of the recorded track centerline from the nominal position should be within 0.025mm. At other temperatures (within the range specified in GB2309-80), the nominal position of the center line of the track can be calculated using the linear expansion coefficient of 24×10-/℃.
2.a.3 Recording deflection angle
At the moment of writing or reading, the angle between the magnetization reversal and the head access line specified in Figure 2 is 4°54°±30°. 2.4 Marking
The following markings are used for testing.
2.4.1 Track marking
The track marking is represented by a three-digit decimal number (000~202). Each recording surface is numbered sequentially from the outermost track to the inside. 2.4.2 Recording surface marking
As shown in Figure 1, the ten recording surfaces are numbered sequentially starting from the lower surface of the top recording disk with a two-digit decimal number (00~09).
2.4.3 Cylinder address
All tracks with the same track mark number in the disk group form a cylinder. The cylinder address is the track mark number. 2.4.4 Track address
A track address is represented by a five-digit decimal number, of which the three high-order digits determine the cylinder address and the remaining one digit determines the record address (the record surface address is the record surface mark number). 2.5 Index
The index is the point that determines the start and end of the track. At the moment when the leading edge of the index notch X of the index disk is detected, the index is located directly below the read gap of the magnetic head (A head and B head, see Figure 3) on the corresponding access line. At this time, the angle between the access radial center line and the radius passing through the leading edge of the index notch X (see Figure 3) should be: = 69°0'54\
2.8 Test area
2.6.1 Header area
Radial center line
GB2949—82
B Head talk/write
Access line
A Head read/write
Access line
Disk center
Figure 3 Track index
Index notch
For testing, the header area is defined as the area starting no later than 100μs after indexing and ending no earlier than 700μs after indexing when the disk assembly rotation speed is 2400rpm.
2.6.2 Data area
For the purpose of testing, the data area is defined as: when the disk group speed is 2400rpm, it starts no later than 700μs after the prime and continues to the area between the next cables.
3 Test conditions and equipment
3.1 General conditions
3.1.1 Speed
During any test, the disk group speed should be 2400±24rpm, and the rotation direction should be counterclockwise (looking down). 3,1.2 Temperature
The temperature of the air entering the disk group should be 27±1℃. 8.1.3 Relative humidity
The relative humidity of the air entering the disk group should be 40%~60%. 3.1.4 Acclimation time
Before testing, the disk group should be acclimated to the same environment as the test equipment for 24 hours. 8.2 Standard reference surface
The standard reference surface is used as the reference for calibrating all secondary standards. The standard reference surface is stored in a designated institution. 3.2.1 Characteristics of the standard reference surface
The standard reference surface is characterized by the area indicated by the notch. And the area is defined as the period from 50us to 275μs after the notch edge. When reading the mountain using the test head (see 3.3), the reference surface should give the following average output voltage (the definition of 1f and 2f frequencies is shown in 3.4.2): Track 2001f7.5mV,
Track 200:2f
Track 0001f11.9mV.
These voltage values are the peak-to-peak values measured after tunnel erasure recording. 3.2.2 Secondary standard reference surface
GB 2949-82
The output voltage of the secondary standard reference surface is related to the output voltage of the standard reference surface, and the relationship is expressed by the correction coefficient CD. The correction coefficient C is:
standard reference plane output voltage
secondary standard reference plane output voltage
The correction coefficient Cn of the qualified secondary standard reference plane should meet 0.901 Header area
Radial center line
GB2949—82
B Header write/read
Access line
A Header read/write
Access line
Disk center
Figure 3 Track index
Index gap
For testing, the header area is defined as: when the disk group speed is 2400rpm, it starts no later than 100μs after the index and ends no earlier than 700μs after the next index.
2.6.2 Data area
For testing, the data area is defined as: when the disk group speed is 2400rpm, it starts no later than 700μs after the index and continues to the next index.
3 Test conditions and equipment
3.1 General conditions
3.1.1 Rotation speed
During any test, the disk group rotation speed shall be 2400±24rpm, and the rotation direction shall be counterclockwise (looking down). 3,1.2 Temperature
The temperature of the air entering the disk group shall be 27±1℃. 8.1.3 Relative humidity
The relative humidity of the air entering the disk group shall be 40%～60%. 3.1.4 Adaptation time
Before testing, the disk group shall be adapted to the same environment as the test equipment for 24 hours. 8.2 Standard reference surface
The standard reference surface is used as the reference for calibrating all secondary standards. The standard reference surface is kept in the designated institution. 3.2.1 Characteristics of the standard reference surface
The standard reference surface is characterized by the area indicated by the notch. And the area is specified as the period from 50us to 275μs after the edge of the notch. When the test head (see 3.3) is used to read the mountain, the reference surface should give the following average output voltage (see 3.4.2 for the provisions of 1f and 2f frequencies): track 2001f7.5mV,
track 200:2f
track 0001f11.9mV.
These voltage values are the peak-to-peak values measured after tunnel erasure recording. 3.2.2 Secondary standard reference surface
GB 2949-82
The output voltage of the secondary standard reference surface is related to the output voltage of the standard reference surface, and the relationship is expressed by the correction coefficient CD. The correction coefficient C is:
Standard reference surface output voltage
Secondary standard reference surface output voltage
The correction coefficient Cn of a qualified secondary standard reference surface should meet 0.901 Header area
Radial center line
GB2949—82
B Header write/read
Access line
A Header read/write
Access line
Disk center
Figure 3 Track index
Index gap
For testing, the header area is defined as: when the disk group speed is 2400rpm, it starts no later than 100μs after the index and ends no earlier than 700μs after the next index.
2.6.2 Data area
For testing, the data area is defined as: when the disk group speed is 2400rpm, it starts no later than 700μs after the index and continues to the next index.
3 Test conditions and equipment
3.1 General conditions
3.1.1 Rotation speed
During any test, the disk group rotation speed shall be 2400±24rpm, and the rotation direction shall be counterclockwise (looking down). 3,1.2 Temperature
The temperature of the air entering the disk group shall be 27±1℃. 8.1.3 Relative humidity
The relative humidity of the air entering the disk group shall be 40%～60%. 3.1.4 Adaptation time
Before testing, the disk group shall be adapted to the same environment as the test equipment for 24 hours. 8.2 Standard reference surface
The standard reference surface is used as the reference for calibrating all secondary standards. The standard reference surface is kept in the designated institution. 3.2.1 Characteristics of the standard reference surface
The standard reference surface is characterized by the area indicated by the notch. And the area is specified as the period from 50us to 275μs after the edge of the notch. When the test head (see 3.3) is used to read the mountain, the reference surface should give the following average output voltage (see 3.4.2 for the provisions of 1f and 2f frequencies): track 2001f7.5mV,
track 200:2f
track 0001f11.9mV.
These voltage values are the peak-to-peak values measured after tunnel erasure recording. 3.2.2 Secondary standard reference surface
GB 2949-82
The output voltage of the secondary standard reference surface is related to the output voltage of the standard reference surface, and the relationship is expressed by the correction coefficient CD. The correction coefficient C is:
Standard reference surface output voltage
Secondary standard reference surface output voltage
The correction coefficient Cn of a qualified secondary standard reference surface should meet 0.90
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