A CDE Definition
(Cylinder Head Sector) An earlier method of addressing a hard disk by referencing all three physical elements of the drive. It was superseded by logical block addressing (see LBA).
(Logical Block Addressing) The way storage drives are accessed by a single sector number rather than by the earlier cylinder, head and sector (CHS) method. LBA was introduced in the early 1990s to support ATA/IDE drives as they reached 500MB, and Enhanced BIOSs in the PC translated CHS addressing into LBA. Subsequent ATA specifications raised support to 8.4GB, 128GB and 128PB (petabytes), the latter capacity we hope never to reach on our home PC in many lifetimes. See IDE and BIOS.
An Example of LBA Counts
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