| Abbreviation | Definition |
|---|---|
| HCT | High-speed CMOS (Complementary Metal Oxide Semiconductor) TTL (Transistor-Transnstor Logic) |
| HD | Hard Disk |
| HD | high definition |
| HD | High Density |
| HDA | Head Disk Assembly |
| HDAD | High Definition Audio Device |
| HDAD | Hybrid Digital Audio Disc |
| HDAV | High Definition Audio Visual |
| HDC | Handle-to-Device Context |
| HDC | Hard Drive Controller |
| HDC | High Definition CODEC (CODer-DECoder) |
| HDCD | High Definition Compact Digital |
| HDCD | High Density Compatible Digital |
| HDD | High Density Disk |
| HDD | Hub Direct Display |
| HD-DVD | High Definition Digital Versatile Disk |
| HDI | Hard Drive Indicator |
| HDL | Hardware Descriptive Language |
| HDL | Hardware Distributors Ltd |
| HDM | Hardware Device Module |