User's Manual

HP Designjet T Series — Service Manual 3-69
Service Utilities
10. Disk Wipe DoD 5220.22OM
The purpose of this Service Utility is to securely erase data on the Hard Disk
according to the directive DoD 5220.22-M.
The printer's hard disk is used as a temporary storage area for print jobs.
The
Secure Disk Wipe utility can erase your information from the hard disk
to prevent unauthorized access.
Secure Disk Wipe provides three different levels of security:
 Unsecure Mode: all pointers to the information are erased. The
information itself is NOT erased, and remains on the hard disk until the
disk space it occupies is needed for new print jobs. The new print
information overwrites the old information. While the information remains
on the disk, it is difficult for most people to access, but may be accessed
using software designed for that purpose. This is the normal method in
which files are erased on most computer systems; it is the fastest method
but the LEAST secure. This is the default security level when using Secure
Disk Erase.
 1 Pass Mode: all pointers to the information are erased, and the
information itself is immediately overwritten with a fixed character
pattern. This method is slower than Non-Secure Fast Erase, but more
secure. It may still be possible to access fragments of the erased
information by using special tools to detect residual magnetic traces.
 5 Pass Mode: all pointers to the information are erased, and the
information itself is repetitively overwritten using an algorithm designed to
eliminate any residual traces. This is the slowest method, but the most
secure. Secure Sanitizing Erase meets the US Department of Defense
5220-22.m requirements for clearing and sanitization of disk media.
Perform the Disk Wipe DoD 5220.22OM utility as follows:
1 In the Service Utilities submenu, scroll to "Disk Wipe DoD 5330.22-M" and
pre
ss OK.
2 In the Disk Wipe DoD 5330.22-M submenu, scroll to "Sanity Level" and
press Enter