logical block
logical block number 逻辑块号
Logical Block
The smallest addressable space on a disk. Each logical block is identified by a unique Logical Block Number (LBN), assigned in order starting from 0 at the beginning of the disk. Under the ISO 9660 standard, all data on a CD is addressed in terms of Logical Block Numbers. At present, CD recording is supported at one Logical Block per logical sector.