section a-a a-a

HDC Hard Disk Connector

HDC Hard Disk Controller

a chip in porridge

A-A-A conjugation structure

S-A(A-A) missile

A.A.A.

a hard case

a hard nut to crack

a hard row to hoe

a hard sphere unit

applications found on hard disk

assembly hard-disk (HDA)

ATA Hard Disk

ATA hard disk drive card

Backup and restore of floopy disk and hard disk

card-level hard disk

data recovery of hard disk

Diffraction by a hard-edge aperture