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©2005 Digital Intelligence, Inc.
Summary of Switch Settings
Switch 1
: Not Used
Switch 2
: OFF = Unit reports errors if writes are attempted
ON = Unit suppresses errors if writes are attempted (no-error)
Switch 3
: Only functions if Switch 1 = OFF, i.e., read-only
OFF = Unit reports Write-Protect (WP) status in code page
ON = Unit suppresses Write-Protect (WP) status in code page
Switch 4:
Reserved
Important Considerations
Removal of Drives. DO NOT
disconnect the USB Device from the UltraBlock
while the unit is powered on.
Do Not Use USB Cable Extenders.
When operating the UltraBlock device via
the USB interface it is important to understand that the USB communication
specification does NOT permit cable extenders such as those used to bring the
USB connector to the front of the computer. A number of name-brand
computer, motherboard, and case manufacturers have adopted the practice of
bringing the USB connector to the front of the computer by using a cable
extender even though this practice is not compliant with the official USB
specification. Unfortunately, these front-panel connections are usually not as
reliable as the direct-to-the-circuit-board USB connectors typically found on the
motherboard or hub. If you have trouble using a front-panel USB connection,
try using the rear USB connectors instead. Also, data integrity issues may be
more apparent when using the higher bit rates of USB 2.0 communication via
these remote connections. In the event that you wish to use a “remote” USB
connector, you should only use the highest quality USB 2.0 cables and validate
the integrity of the resulting configuration to your satisfaction.
Disk Cache.
When using an operating system that caches disk writes
(Windows 95/98/ME for example), it may appear information has been written to
the drive (via Windows Explorer for example); when in actuality the information
has only been stored in the disk cache. A subsequent reboot of the system will
clear the disk cache and show that no changes/modifications were made to the
write protected drive. Pressing “CTRL-C” in MS-DOS will cause the disk cache
to be reset and show this fact as well. Most forensic imaging software uses
direct disk access to read directly from the disk itself, the contents of the
operating system disk cache will not affect the ability to image the disk. (This
includes the “_Restore” directory created by Windows ME).
Summary of Contents for UltraBlock USB
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