Methods of Overwriting
You can select a method of overwriting from the following:
• NSA
Temporary data is overwritten twice with random numbers and once with zeros.
• DoD
Temporary data is overwritten with a fixed value, the fixed value's complement, and random numbers.
When completed, the overwriting is then verified.
• Random Numbers
Temporary data is overwritten multiple times with random numbers. The number of overwrites can be
selected from 1 to 9.
• The default method for overwriting is "Random Numbers", and the default number of overwrites is 3.
•
NSA stands for "National Security Agency", U.S.A.
• DoD stands for "Department of Defense", U.S.A.
Using Auto Erase Memory
This can be specified by the machine administrator.
For details about logging in and logging out with administrator authentication, see "Logging in Using
Administrator Authentication" and "Logging out Using Administrator Authentication".
• When Auto Erase Memory is set to [On], temporary data that remained on the hard disk when Auto
Erase Memory was set to [Off] might not be overwritten.
•
If the main power switch is turned off before Auto Erase Memory is completed, overwriting will stop
and data will be left on the hard disk.
• Do not stop the overwrite mid-process. Doing so will damage the hard disk.
• Should the main power switch be turned off before Auto Erase Memory is completed, overwriting will
continue once the main power switch is turned back on.
• If an error occurs before overwriting is completed, turn off the main power. Turn it on, and then repeat
from step 1.
1. Press the [User Tools/Counter] key.
2. Press [System Settings].
3. Press [Administrator Tools].
Press [
Next] repeatedly until [Auto Erase Memory Setting] appears.
Deleting Data on the Hard Disk
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