Control Data 3170 Installation Handbook page 207

Computer systems, msos version 5
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8.
Enter the starting addresses into the upper and lower portions of the address
register.
9.
If there is no usable data in the sectors where new headers are to be written,
both the HEADER and DATA switches should be set to the WR.ITE position.
If there is useful data in the sectors and only headers are to be written, the
HEADER switch must be set to the WRITE position and the DATA switch to
the READ- position.
NOTE
Do not use the REPEAT mode switch when
writing headers.
The REPEAT switch must
be OFF.
10.
Press the SEEK ADRS. switch.
11.
The seek address operation ends when the address of the last sector of the
selected storage area has been written or an abnormal condition is displayed
in the status register.
Reset HEADER and DATA switches to READ.
III-2-2
60410800 A

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