LBA – Logical Block Address – used in a hard disk drive (HDD) addressing scheme to identify blocks on the drive and so read data from or write data to them. The disk with its platters is treated as a single logical drive with sectors (blocks) having a unique number in a linear sequence starting from zero. The HDD controller translates logical block addresses into specific sectors on specific tracks (cylinders) on specific platter surfaces (heads).

Logical Block Addressing is an abstraction of Cylinder/Head/Sector addressing.