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Print Controller Design Guide for Information Security:
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7. Data Erase/Overwrite
Overview
• A wide variety of data is stored in MFP/LP memory both permanently and temporarily. The HDD stores
data such as image data, email destinations, and Address Book data containing various types of user
information. In addition, the NVRAM stores data such as User Tools settings, while the FCU stores FAX
reception image data. Data stored on the magnetic media of the MFP/LP is normally “erased” by
overwriting it with a fixed value (normally, this is performed once).
• However, in the case of a print/copy job, for example, although the MFP/LP completely erases the page
location data (the storage location information necessary to access image data on the HDD), the image
data itself remains in the temporary storage stored area of the HDD. The Data Erase/Overwrite feature,
provided to the field as optional software stored on an SD card, renders this image data indecipherable.
Even in the unlikely event that the HDD were removed from the MFP/LP, a third party would not be able
to reconstruct the original data.
• In rare cases, performing the overwrite just once may not be enough to completely alter the magnetic
pattern of the data to an indecipherable level, leaving the possibility of partial reconstruction of the
original data. Because of this, the optional Data Erase/Overwrite feature employs the following
methods, which ensure that data reconstruction is not possible.
The DoD method, developed and required by the U.S. Department of Defense
The NSA method, developed by the U.S. National Security Agency
The Ricoh randomized value method, a Ricoh-original method which overwrites data using
randomly-generated values
Note: The DoD and NSA methods automatically perform three passes, using a different pattern
each time (the number of passes is unchangeable). The Ricoh randomized value method
performs three passes by default, using a different set of randomly-generated numbers each
time; however the number of passes can be set from 1-9. Comparing the DoD method, NSA
method and Ricoh randomized value method (set at three or more passes), no single method
is any safer than the other two. Under these conditions, all three methods render the data
equally indiscernible. Regardless of which method is selected, the more passes are made,
the more indiscernible the original data becomes (although performing more passes requires
more time).
• Before the Data Erase/Overwrite option can be run on the MFP/LP, a service technician must perform
the setup procedure. If the SD card is removed from the slot at any time after installation, the option will
cease to function and an error message will be displayed on the operation panel, however the machine
will continue functioning normally. Also, it is not possible to remotely verify whether or not the option is
installed or actually running.
• To execute the overwrite the operator can choose from two options: “Auto Erase Memory” and “Erase
All Memory” (detailed descriptions below).
- Version 1.00 1
- Page 2 of 92 2
- TABLE OF CONTENTS 3
- 1. Overview 4
- Applicable Products 4
- Note: 5
- 2-1 Hardware Configuration 6
- Page 7 of 92 7
- 2-2 Software Configuration 8
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- 3. Data Security 11
- Page 12 of 92 12
- 4. Firmware Update 13
- (from a client PC) 15
- (performed by the end user) 16
- Page 17 of 92 17
- (input from operation panel) 18
- Authentication information 18
- Page 20 of 92 20
- Page 21 of 92 21
- 6. Administrator Settings 22
- 7. Data Erase/Overwrite 23
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- 8. Data Protection 25
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- 10. Job/Access Logs 29
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- 13. Printer 40
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- 15. FAX (MFP Models Only) 53
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- 16. NetFile (GWWS) 59
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- 18. Web Applications 70
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- 20. Optional Features 75
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- API for development of 85
- SDK application 85
- SDK Application 85
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