3
Methods of Overwriting
You can select a method of overwrit-
ing from the following:
Note
❒ Default: NSA
❖
❖❖
❖ NSA
*1
Temporary data is overwritten
twice with random numbers and
once with zeros.
❖
❖❖
❖ DoD
*2
Temporary data is overwritten
with a fixed value, the fixed val-
ue’s complement, and random
numbers. It is then verified.
❖
❖❖
❖ Random Numbers
Temporary data is overwritten
multiple times with random num-
bers. The number of overwrites
can be selected from 1 to 9. The de-
fault is 3 times.
*1
National Security Agency, U.S.A.
*2
Department of Defense, U.S.A.
Using Auto Erase Memory
A
AA
A
Press the {
{{
{User Tools / Counter}
}}
} key.
B
BB
B
Press [System Settings].
C
CC
C
Press [Administrator Tools].
D
DD
D
Press [T
TT
T Next].
E
EE
E
Press [Auto Erase Memory Setting].
F
FF
F
Press [On].
G
GG
G
Select the method of overwriting.
When you select “Random
Numbers”
A Press [Change].
B Enter the number of times that
you want to overwrite using
the number keys, and then
press [#].
H
HH
H
Press [OK].
Auto Erase Memory is set.
Important
❒ When Auto Erase Memory is set
to On, temporary data that re-
mained on the hard disk when
Auto Erase Memory was Off
might not be overwritten.
ZGVS010E
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