The string "archivefhdsone460 5mp4 upd" appears to be a specific filename or search tag often associated with media archives or file-sharing platforms like Internet Archive.

References

I plugged the drive into my isolated sandbox machine—a rig I keep offline, specifically for potentially malicious hardware. The drive mounted slowly, the folder structure a mess of corrupted bytes and fragmented trees. But that one file sat there, 4.2 gigabytes of data, waiting.

fhd: Likely stands for Full High Definition (1080p resolution).