Best Practice for Using a USB Flash Drive

Note - USB-C interfaces should be treated as controlled external access points and only used where operationally necessary. Access via USB-C should be aligned with your organizational policies governing external device connectivity. Connections should not be left permanently connected unless explicitly required and risk-assessed. Extender cables should be shielded and not exceed 1.5 m (4.92 ft) in length. Where USB-C ports are exposed, for example, panel-mounted, they should be physically protected and implemented with appropriate environmental (IP) ratings.

The following are general hints and tips to help you ensure the security of your USB Flash Drives and the data on them, consider the following best practices:

  • Control issuing and/or authorizing of USB Flash Drives - The use of USB devices within operational technology (OT) or critical systems should be strictly controlled, with data transfers performed via designated and secured intermediary systems where possible.

  • Report any loss, theft, or suspicious behavior - Any loss, theft, or suspicious behavior must be reported immediately in line with incident response procedures.

  • Scan for Malware - All USB flash drives should be scanned for malware before and after use, and autorun features disabled.

  • Be Cautious in Public - Avoid using your USB flash Drive on public computers or shared workstations to reduce the risk of malware or unauthorized access.

  • Regular Backups - Always maintain backup copies of the data stored on your USB flash Drive to ensure data safety.

  • Invest in a Security Lock - Where possible, use USB flash drives that provide built-in hardware encryption or other security features to add an extra layer of protection if the drive is lost or stolen.

  • Use Encryption Software - Depending on your operating system, consider using appropriate encryption method, for example, BitLocker for Windows or FileVault for macOS to encrypt your USB Flash Drive.

  • Use a Keychain or Lanyard - Attach your USB Flash Drive to a keychain or lanyard to help prevent it from being misplaced.

By following these practices, you can significantly improve the security of your USB Flash Drive and protect your valuable information from theft, corruption, malware, and physical damage.

See Cybersecurity Considerations for details.

Last update - April 2026