HAL (Hardware Abstraction Layer)
HDA (Head Disk Assembly)
HEL (Hardware Emulation Layer)
HERS (hard error rates)
HFC (hybrid fiber/coax)
HFC (hydrofluorocarbon)
HLF (High-Level Formatting)
HMA (High Memory Area)
HP-GL/2 (Hewlett Packard Graphics Language)
HPA (high performance addressing)
HPFS (High Performance File System)
HRD (High-Resolution Diagnostic Diskette)
HST (high-speed protocol)
HUD (Heads Up Display)
HVD (High Voltage Differential) signaling
Hz (Hertz)