An addressable unit on a compact disc. Each logical block, as described in ISO 9660, is assigned an identifier, referred to as the Logical Block Number (LBN). LBNs are assigned in sequence starting from block number 0. Logical Block Numbers are used to locate data stored on a disc.

a block numbered and tracked by its relative position on the disk

An allocation unit of Volume space under ISO-9660, defaulting to 2048 bytes.

(1) An abstract location on a storage device, defined by software and independent of the physical characteristics of the device

groupings of organized data defined by system software for efficient transference between peripheral devices