CRU 31050-1976-0000 USB cable

Write-Blocking Cable for Forensic Imaging

The CRU 31050-1976-0000 is a USB 3.1 write blocker designed for investigators and technicians who must acquire data from storage media without altering the source. It enforces read-only access at the hardware level across three connected devices simultaneously. This tool suits digital-forensics labs, incident-response teams and IT security auditors who need assured evidence integrity during acquisition.

Hardware Write Protection with Bus Power

The unit implements a physical write-blocking circuit that prevents any host write commands from reaching attached drives, while a status LED confirms the active protection state. It draws power from the host USB connection, eliminating the need for an external adapter and reducing cable clutter at the workstation. A standard US plug is included for configurations where supplemental power is preferred.

USB 3.1 Gen 1 Throughput Ceiling

The interface operates at USB 3.1 Gen 1 speeds, capping sustained transfer rates at the bus maximum rather than the drive’s native performance. Mechanical hard drives and older solid-state media will typically saturate the link, while newer high-speed SSDs will be bottlenecked by the 5 Gbit/s ceiling. The blocker also supports USB 3.0 and 2.0 devices, though each falls back to its respective lower bandwidth limit.