USB WriteBlocker

USB WriteBlocker
Product Banner
Forensic in-line USB write-blocker
    • Convenient USB write blocking
    • Reliable evidence protection
    • Access to different USB devices

USB WriteBlocker

Lawyers, forensics investigators, and corporate IT staff who want to view and image USB mass storage devices, such as mobile phones and cameras, rely upon the CRU® WiebeTech® USB WriteBlocker™ to protect data.

The compact USB WriteBlocker connects to USB storage devices and protects their contents during an investigation. To use, simply connect the WriteBlocker to the suspect device.

The USB WriteBlocker connects to most USB storage devices: USB thumb drives, digital cameras, cell phones, or most anything with a USB connection.

Use the included Forensic Software Utility to display information about connected devices and enable you to save the information in common text formats.

Additional features:

  • Compact design
  • Plug-and-use operation
  • Free US-based customer support

Whether you're a corporate IT manager, forensic investigator, or lawyer, the USB WriteBlocker is a valuable part of your investigation toolkit. Find a reseller near you or buy online.

Part Numbers

USB WriteBlocker

Inline USB pass-through device; blocks writes to attached USB mass storage devices; bus-powered

Black; w/cable & lanyard
part #: 31300-0192-0000
Ships in: 1-2 Days


USB Power Cable for USBWB

Accessory for USB WriteBlocker; allows bus-powerable USB drives to be used with USBWB without AC adapter

part #: 30080-0100-0000
Call 1-360-816-1800 or email us for availability


Product name USB WriteBlocker
Host (I/O) Ports (1) USB 2.0: up to 480 Mbps
Drive Types Supported
  • USB Thumb Drives
  • USB drives via USB cable (if the device class is USB Mass Storage Device and it does not use proprietary firmware)
Maximum HDD size 2000 GB (1000 GB in a Terabyte)
Number of LEDs 1
Description of LEDs Power, drive access
Operating system compatibility Windows XP or later
Windows Server 2003 or later
Mac OS X
Most modern Linux distributions
Construction material(s) ABS
Bus power Yes
Dimensions 4.13" x 1.02" x 0.63" (105mm x 26mm x 16mm)
Weight 0.10 lbs. (0.05 kg)
Write Blocking Yes
Compliancy FCC, CE, RoHS, C-Tick
Warranty CRU provides a 2-year limited warranty for this product.
Technical Support Your investment in CRU products is backed up by our free technical support for the lifetime of the product. If you need to contact us for any reason, visit or call us at 1-800-260-9800 or +1-360-816-1800.

Product Images


Apr 13, 2011 - 727.97 KB
User Manual for USB WriteBlocker
A9-000-0013 Rev 1.2-FSU_user_manual.pdf
May 10, 2013 - 379.49 KB
User Manual for Forensic Software Utility
Aug 27, 2013 - 7.53 MB
Forensic Software Utility

(for 32-bit versions of Windows)
Aug 27, 2013 - 8.55 MB
Forensic Software Utility

(for 64-bit versions of Windows)
Dec 4, 2013 - 7.12 MB
Quick Start Guide for USB WriteBlocker
May 8, 2015 - 17.45 MB
Forensic Software Utility

(for 64-bit versions of Windows)
May 8, 2015 - 15.53 MB
Forensic Software Utility

(for 32-bit versions of Windows)
May 8, 2015 - 195.85 KB
Forensic Software Utility (command line for Linux)
May 8, 2015 - 13.58 MB
Forensic Software Utility (Mac OS X)

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