Xerox 850DX - Phaser Color Solid Ink Printer Release Note - Page 14

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8 Release Notes

The following information supplements the 10.X customer user guides.

8.1.1.1

OVERVIEW

The Disk Image Overwrite feature has two operations: Immediate and On Demand. The

immediate operation overwrites image data on the hard drive immediately after it is no longer

needed (i.e. When the page has printed). The On Demand operation cleans the entire disk.

Both On Demand Image Overwrite and Immediate Image overwrite feature are configured by the

system administrator, assuming that the system administrator password is set to a non-zero

value.

8.1.1.2

ALGORITHM

The overwrite algorithm for both IIO and ODIO conforms to the U.S. Department of Defense

Directive 5200.28-M (Section 7, Part 2, paragraph 7-202), and is common to all

WorkCentre/WorkCentre Pros and AccXES controllers.

The algorithm for the Image Overwrite feature is:

Step 1: Pattern #1 is written to the sectors containing temporary files (IIO) or to the entire

spooling area of the disk (ODIO). (hex value 0x35 (ASCII "5")).

Step 2: Pattern #2 is written to the sectors containing temporary files (IIO) or to the entire

spooling area of the disk (ODIO). (hex value 0xCA (ASCII compliment of 5)).

Step 3: Pattern #3 is written to the sectors containing temporary files (IIO) or to the entire

spooling area of the disk (ODIO). (hex value 0x97 (ASCII "ú")).

Step 4: 10% of the overwritten area is sampled to ensure Pattern #3 was properly written. The

10% sampling is accomplished by sampling a random 10% of the overwritten area.

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