IBM 3741 Data Station Reference Manual page 141

The following chart provides approximate timing infor-
mation for search, copy, and initialization operations on the
3741. Timings are 'shown for the normal sector sequence
(1, 2, 3, .... 25, 26) and for the alternate sector sequence
(1,3,5, .... 25, 2,4, .... 24, 26). The timings provided in
the chart should serve as a useful guide when relative job
timing must be considered.
Appendix A. Timings
The timings are based on 80 character records. Timing can
be affected by such things as disk speed, length and location
of search masks, and the location of data sets on the disk.
OPERATION NUMBER OF NORMAL SECTOR AL TERNATE SECTOR -
RECORDS SEQUENCE
SEQUENCE
DISK 1 DISK2 DISK 1 DISK 2
Search end 1898 (assume
of data
EOD is 74001)
5 sec 5 sec 5 sec 5 sec
949 (assume
EOD is 37014) 3 sec 3 sec 3 sec 3 sec
400 (assume
EOD is 16001) 2 sec
2 sec 2 sec 2 sec
Search on
1898
30 sec 8 sec 30 sec 8 sec
sequential
949 15 sec 8 sec 15 sec 8 sec
content
400 8 sec 8 sec 7 sec 7 sec
Search on 1898 5 min
5 min
2 min 8 min
content 30 sec 30 sec 50 sec
949 2 min 2 min 1 min 4 min
45 sec 45 sec 30 sec
400 1 min 1 min
1 min
10 sec 10 sec 40 sec 45 sec
Disk 1 min 1 min
initializa-
-------
50 sec
------
50 sec
------
tion
Image copy
1898 plus
3 min 10 min
------
------
index track 30 sec
Data set 949 10 min 9 min
------
------
copy
Data set 400 4min 3min
30 sec
------
50 sec
------
copy
Timings 135