Xerox WorkCentre PE120-120i-6420 - Manual (Page 3)

Certificate of Volatility
3
Example: If the SUN is turned on without this means of checking for the authorized
configuration, the system will not boot and therefore the data cannot be processed per the
standard Practice Procedure (SPP).
ROM memory device content is required and essential for operation and normal function of the
device. Loss would render the device inoperable.
.
6.
Method of access: How is it accessed? Is non-volatile memory location theoretically
accessible with any system code, not just via the operating system or low level booting
firmware?
Marking Engine non-volatile memory is used for storing Multifunction Device application
settings and is accessible by application level code. There is no user access to the memory
devices, except as provided programmatically to control device behaviors.
Remember: Modifying internal programming to access is not the same thing as unknowingly
accessing from an accidental keyboard stroke.
7.
Warranty: Does chip removal or EEPROM erasure void the warranty?
Yes, memory removal or erasure will void the warranty. Disk removal of the internal disk drive
will void the warranty.
8.
Size: How much memory is contained? Number of bytes, etc.
See section 1, “Type of Memory”
9.
Spacing: Is the memory fully utilized or does it have available memory space for additional
information to be placed?
The non-volatile memory devices are sized to contain the necessary amount of data required for
system operation. Usually there are some unused memory addresses where additional
information could be theoretically stored. Without access to the software developers’ memory
maps, determining the location of this unused memory would require reverse engineering the
software.
10.
Can this non-volatile memory be addressed to ensure that only authorized information is
resident? If yes, how?
At boot-up, the system computes a checksum for each non-volatile memory device. (Note:
The computed checksum is compared against a value stored in the device itself. This is
sufficient to detect hardware failures, but not necessarily intentional corruption.)