IBM 7074 General Information Manual page 20

Area Cylinder
A
0- 49
B 50 - 99
C 100 - 149
D
150 - 199
E 200 - 249
Cylinder Areas
0 - - - 9 10--1920-24
1
25--34
1
3 5 - - 44
1
45-49
1
I Sect 1 1 Sect 2 1 Sect 3 Sect 4 Sect 5 Sect 6
Sections within aCyl inder Area
Figure 12. Access Motion Areas and Sections
0-
0-
§o-
0-
0-
0- ~ ~~ 0-
M 0-
0
o __
'I
, ,
I
,
,
8
~~8 ~ 0
0
0 ~
0
0 0 ___
0000-0399
0400-0799
0800-0999
1000-1199
1200-1599
1600-1999
2000-2399
2400-2799
2800-2999
3000-3199
3200-3599
3600-3999
III
III
4000-4399
Q)
-6
"'tJ 4400-4799
«
4800-4999
~
u
5000-5199
c
5200-5599
.=
g/
5600-5999
6000-6399
6400-6799
6800-6999
7000-7199
7200-7599
7600-7999
8000-8399
8400-8799
8800-8999
9000-9199
9200-9599
9600-9999
(In Milliseconds)
TO Track Address
0-
0- 0- 0- 0-
0- 0- ~~~~ 0-
~ 0- 0- 0- 0-
0-
~
~
~~M~
0-
N M "<t
,. ,.'? '? '?
,
,
I
, , , ,
8 888 8 0 0
~8°8
0
0 0 ~8N 0
"<too
N ~~ -0
N NNMM It') It')
It')
NOTE: • = 50 milliseconds
~
"" 120 milliseconds
1;1
= 180 milliseconds
Figure 13. 1301 Disk Storage Access Time
0-
~
-0
I
0
8
-0
0- 0-0- 0- ~ 0- 0- 0-0- 0- 0-
0- 0-0- 0- ~ ~~~~ 0-
" 0-_
It')
~ 0-
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-0" "
00 00 000- 0- 0-
, , I
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, I
, ,
0 0 0 0 0 0 0 0 8 8 8
~~8~ 0 8 ~~
N ~ -0
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00 00 000- 0-
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Operations 19