Transferring sensitive data is one of the critical points in modern document management, especially when it involves physical devices such as USB drives or external hard drives. The simplicity and convenience of USB data transfer make these devices ideal for temporary storage and for carrying data, but they also pose a significant risk when used without proper security precautions. Companies that use document management platforms should therefore take particular care with data transfers to ensure the integrity and confidentiality of information.
This article sets out good practices and key precautions for transferring data via USB drives and external hard drives, with a focus on protecting sensitive data. The practices presented are aligned with information security and data protection standards and regulations, such as the GDPR (General Data Protection Regulation). Data management and cybersecurity are closely linked, and any failure to protect data during transfer can lead to serious privacy breaches and damage to a company’s reputation.
This article is aimed at companies and professionals who work with document management platforms, with particular emphasis on sectors where data security is a priority. Below, we present practical and technical measures to ensure secure data transfer with these devices, minimising the risk of attacks and data breaches.
Risks of transferring data with USB drives and external hard drives
Transferring data via USB drives or external hard drives carries risks in two main categories: physical security and cybersecurity.
Physical security
The theft or loss of an external storage device, such as a USB drive, can expose sensitive data. Because they are small and easy to carry, these devices are easily lost in public places and are easy targets for theft, exposing confidential data to malicious third parties. A lack of proper control over who has physical access to the device is therefore a weak point.
Cybersecurity
Another concern lies in cyber risks, such as malware and ransomware attacks. External storage devices may contain malware, which can then spread to company systems during data transfer. In addition, if the data stored on the device is not properly encrypted, anyone with access to the device can read and modify it.
Best practices for secure USB data transfer and external drives
To mitigate the risks associated with external storage devices, companies should implement a set of good practices that ensure data security and integrity.
Data encryption
Encryption is the first line of defence when transferring sensitive data. For this reason, the company should encrypt all data stored on a USB drive or external hard drive with strong encryption standards, such as AES-256. This ensures that, even if the device is lost or stolen, the data it contains remains unreadable to unauthorised people. Encryption guarantees confidentiality and is consequently an essential measure for complying with data protection regulations.
Two-factor authentication (2FA)
Whenever possible, the company should implement an extra layer of authentication. Some modern devices allow additional authentication mechanisms to be set up to access stored information, such as strong passwords, biometric authentication or temporary security codes, which makes unauthorised access more difficult.
Using anti-malware software
Before connecting any external storage device to a company computer, the user should scan it with up-to-date antivirus or anti-malware software. In this way, they can check whether the device contains viruses or malicious programs. This step is important because these devices often move between multiple environments, which increases the risk of malware infection.
Controlling physical access to USB drives and external hard drives
Limiting who can physically access external storage devices is one way to minimise risk. The company should therefore implement a strict control policy on who is authorised to use USB drives and external hard drives. Ideally, the company should only provide approved devices, to ensure they meet security requirements.
Auditing and monitoring usage
Document management platforms should include mechanisms to monitor and audit the use of external storage devices. Recording the date, time, user and nature of the data transferred makes it possible to identify potential security breaches and trace suspicious behaviour.
Data retention and deletion policies
Once the data has been transferred, the company should ensure that it is properly deleted from the external storage device to prevent any unauthorised access in the future. Using secure data deletion methods, such as file shredding software, is recommended practice.
Compliance with information security standards
Following information security standards is fundamental to protecting data during transfer. Compliance with the GDPR, for example, is mandatory for organisations that process personal data of people in the European Union, within its territorial scope. Compliance includes ensuring the protection of personal data throughout its life cycle, from collection to final storage.
Policies for using external storage devices
Companies should adopt clear policies governing the use of external storage devices, setting out which data can be transferred, who can do so and under what conditions. Moreover, they should update these policies regularly as cybersecurity threats evolve.
Employee training
Ongoing employee training is essential to ensure that everyone understands the risks of using external storage devices and knows how to apply the necessary security measures. This includes regular training on data encryption, identifying potential threats and good digital security practices.
Compliance audits
Regular compliance audits help ensure that security practices are correctly implemented and maintained. Above all, these audits make it possible to identify areas for improvement and ensure the company remains compliant with data protection regulations.
Safer alternatives to USB drives
In many cases, the best way to reduce risk is to avoid using external devices altogether. Today, there are alternatives that make it possible to share documents with greater control:
- sharing through the document management platform itself, with user-level permissions;
- password-protected sharing links with an expiry date;
- file transfer services with encryption and access logs;
- shared folders in the corporate cloud, managed by the IT team.
As a result, the company always knows who has accessed each document and can revoke access at any time. By contrast, a lost USB drive is no longer under control.
Practical example: Site documentation on a lost USB drive
Imagine a technician who stores the training records and fitness-for-work certificates of 50 workers on a USB drive to show them during an audit at a client’s premises. On the way back, the drive is lost on public transport.
If the data is not encrypted, the company faces a possible personal data breach, including health data, and may have to notify the CNPD, the Portuguese data protection authority, within 72 hours. Conversely, had the drive been encrypted, or had the audit been carried out through controlled access to the platform, the risk would have been much lower. For this reason, many companies choose to block the use of USB drives and provide secure alternatives.
Frequently asked questions
Can the use of USB drives be blocked on company computers?
Yes. Device management tools make it possible to block external storage devices or authorise only approved, encrypted models.
Does the loss of a USB drive containing personal data have to be reported?
If the loss poses a risk to the rights of data subjects, the GDPR requires notification to the supervisory authority within 72 hours. Strong encryption significantly reduces that risk.
Conclusion: Using USB drives and external hard drives securely
Transferring sensitive data via USB drives and external hard drives requires a comprehensive approach to security. Good practices, such as data encryption, two-factor authentication and device monitoring, are essential to protect data against theft, loss and unauthorised access. In addition, compliance with data protection standards, such as the GDPR, is crucial to avoid legal penalties and maintain customer trust.
Companies that adopt these practices and continuously educate their employees about the risks and precautions involved are better prepared to handle the complexities of data transfer. By implementing a rigorous approach, companies can minimise risks and ensure that critical data remains protected at every stage of the transfer process.
Finally, adopting these measures not only ensures information security but also strengthens the organisation’s integrity and reputation in the market, which is especially important in sectors that handle confidential data every day.
Read also: The importance of encryption in data protection and Ransomware and backups: How to make sure recovery is really possible.
To learn about personal data protection rules, see the Portuguese Data Protection Authority (CNPD).