Immediate Image Overwrite; Immediate Image Overwrite Algorithm - Xerox 6279 User Manual

Immediate Image Overwrite

At most installations, users are able to recall the last copy or scan job and all the
associated settings. The recalled image(s) then can be printed without rescanning the
originals. This is the case when the Image Recall function (discussed above) is enabled.
Security concerns in some work environments might require that the image recall feature
be disabled so that sensitive materials are eliminated from the Accxes controller hard
drive.
NOTE
Immediate Image Overwrite cannot be enabled if either Job Reprint or
Administrator-Managed Queue features are enabled.
Once the Immediate Image Overwrite (IIO) feature is enabled, images that are scanned
in are immediately deleted from the Accxes hard drive. In addition, the administrator
can go a step further to enable On Demand Image Overwrite (ODIO), which restarts the
system and completely eliminates from the hard drive files that are already scanned in
and files that are scanned in the future.
1. Select Machine Info from the Services menu screen.
The Machine Information screen displays.
2. Select the Administration tab.
3. Select General Administration.
4. Select the Enable / Disable Immediate Image Overwrite.
The Set Immediate Image Overwrite Mode screen displays.
5. Select Enabled or Disabled.
See Online Help in Web Printer Management Tool for more details about using the
Immediate Image Overwrite feature.

Immediate Image Overwrite 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:
• 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")).
• 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)).
• 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")).
• 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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Xerox 6279 Wide Format Solution
Copy/Scan User Guide
System Administration
5-13