M065/M066 Correspondence White Paper Ver. 3.0
Page 39 of 58
9. Data Overwrite Security (DOS) function
This function can overwrite print data that is stored on internal hard drive by writing over the latent
image with random sequences of 1’s and 0’s.
This enables to access or reconstruct residential data virtually impossible.
NOTES:
1. Excluding counter for charge, information of engine setting
2. Optional DOS Unit is required.
3. This item must be installed by technician.
9-1 Product Positioning
The DOS solution was designed to meet mainly government, military and super major accounts’
requirement for document security while using printers.
The DOS solution was designed to help sell more LPs by adding a security solution for classified
documents handling applications.
9-2 Overwrite method
Customers can select from three type of overwrite methods provided:
NSA Standard: Random data => Random data => Null data (total 3 times)
The random data is written over the temporary data twice, and then the null data is written over once.
DoD (Department of Defense of USA) Standard
Random Data Overwrite
NOTE:
DOS Unit adopted NSA and DoD method because these are the most commonly used
methods in PC.)
9-3 Overwrite timing
Overwriting starts automatically when print job is completed.
Printer takes priority over the Data Overwrite function. If printer job comes while overwriting the
previous job data, the overwriting process will be automatically interrupted
until the job is completed.
