Abstract: In a portable and secure data storage device 100, access may be gained to a user memory by scanning at least two different fingerprints with a fingerprint scanner 12. In an enrolment mode of the data storage device, at least two different administrator fingerprints from at least one administrator are scanned and enrolled. In a further enrolment mode of the data storage device, at least two different user fingerprints from at least one user are scanned and enrolled. In a normal operation mode of the data storage device, at least two different fingerprints are scanned and verified against the enrolled administrator fingerprints and the enrolled user fingerprints, and access is gained to the data storage device for storing user data and/or retrieving user data if the verification of each of the different fingerprints is successful.