What is logical block addressing (LBA)? - Definition from WhatIs.com


logical block addressing (LBA)

Part of the Computing fundamentals glossary:

Logical block addressing is a technique that allows a computer to address a hard disk larger than 528 megabytes. A logical block address is a 28-bit value that maps to a specific cylinder-head-sector address on the disk. 28 bits allows sufficient variation to specify addresses on a hard disk up to 8.4 gigabytes in data storage capacity. Logical block addressing is one of the defining features of Enhanced IDE (EIDE), a hard disk interface to the computer bus or data paths.

This was last updated in April 2005
Posted by: Margaret Rouse

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