: Indicates the digital video container format used for this specific copy of the file.
: This is the production code (also known as a "JAV code"). "NHDT" is the label, and "511" is the specific release number in that series.
: Users often search for this specific string to find high-quality versions of the production.
While the "NHTD" acronym commonly refers to the Medicaid Waiver Program in professional medical contexts, the specific format of your query (Label-Code-Format@Uploader) is almost exclusively used for cataloging Japanese Adult Video content.