What does HDD stand for?

CMB Commercial, Fort Myers, FL - Manufacturer code for watercraft hull identification number (USCG)

Halogenated Dibenzodioxin - Organic chemistry

Hard Disk Drive - Computer science

Head-Down Display - Aviation

Headsdown Display

Heating Degree Days - Agriculture

Heavy-Duty Detergent

Heavy-Duty Diesel - Vehicle

Heavy Duty Distribution - A publication

Henrion & Dassy - NCIC firearms make code (NCIC)

High Definition Display (SAUS)

High-Density Data (KSC)

High-Density Disk - Computer science (ITCA)

High-Dosage Depth - Medicine (DMAA)

Higher Dental Diploma - British

Homopolar Disk Dynamo

Hoop De Doo Revue - Disney (DIS)

Horizontal Directional Drill - Off-Highway equipment

Housing Development Directorate (SAUS)

Human Disorientation Device

Hyderabad - Pakistan - Airport symbol (OAG)

Hydrogen Donor Diluents - Petroleum chemistry