Overwriting the Data on the Hard Disk
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Overwriting the Data on the Hard Disk
To use this function, the optional DataOverwriteSecurity unit must be installed.
You can overwrite data on the hard disk.
Note
❒ Depending on the hard disk capacity and the method of erasing the data, this
action may take a few hours. The machine cannot be used during this time.
❖
❖❖
❖ Auto Erase Memory Setting
To erase selected data on the hard disk, specify [Auto Erase Memory Setting].
❖
❖❖
❖ Erase All Memory
To erase all the data on the hard disk, using [Erase All Memory].
❖
❖❖
❖ Methods of Erasing the Data
You can select the method of erasing the data from the following:
The default is “NSA”.
*1
National Security Agency
*2
Department of Defense
Reference
For details, see the manual supplied with the DataOverwriteSecurity unit.
“Auto Erase Memory Setting”
This can be specified by the machine administrator.
A document scanned in Copier, Scanner modes, or data sent from a printer driv-
er for printing is stored temporarily on the hard disk of your machine.
Even after the job is completed, it remains in the hard disk as temporary data.
Auto Erase Memory erases the temporary data on the hard disk by writing over
it.
Overwriting starts automatically once the job is completed.
Copier and Printer functions takes priority over the Auto Erase Memory func-
tion. If a copy or print job is in progress, overwriting will begin only after that
job is completed.
NSA
*1
Overwrites the data on the hard disk twice
with random numbers and once with zeros.
DoD
*2
Overwrites the data with a number, its com-
plement, and random numbers, and then
checks the result.
Random Numbers Overwrites the data with random numbers
the specified number of times.
You can specify between 1 and 9 as the
number of times the data is overwritten with
random numbers. The default is 3 times.
MarC25_EN_SecRef_F_FM.book Page 23 Monday, August 2, 2004 6:14 PM
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