An apparatus and method for securely accessing and storing private data files and programs on a personal computing device with network access is provided. A portable data storage unit or authentication unit conjoins to a personal computing device and initiates a software program that delivers hidden authentication information to part of the network. The network then presents secure data files to the user, and enables data and program storage and access by the user. Administrator(s) may program multiple, separately-identifiable portable data storage units to permit different levels of access. When the portable data storage unit or authentication unit is no longer conjoined to the personal computing device, access and presentation of the data are terminated. The portable data storage unit may comprise a pivoting computer port-conjoining member, allowing its housing to run parallel to and lock with the personal computing device housing with a spring-loaded button and ribs along the member.