LLF is an abbreviation for Low Level Format. It is the dividing of the disk's tracks into a specific number of sectors. Each sector's data area is filled with a dummy byte value or test pattern of values. For floppy disks, the number of sectors recorded on each track depends on the type of disk and drive. For hard disks, the number of sectors per track depends on the drive and controller interface. Modern hard drives are low level formatted at the factory after assembly. A low level format is also called a physical format.
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