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Bits. Groups of bits are organized into sectors or blocks, which are further grouped into clusters, which are further grouped into tracks.
80
No, backup is most certainly not that. Formatting is the process fo dividing the disk into tracks and Sectors.
Sectors / Cylinders
Floppy disk has tracks and sectors.
Formatting
A low-level format is the process that marks the location of tracks and sectors on a disk. A disk cannot be partitioned or formatted until a low-level format is completed.
A disk cluster is a location on a disk's surface that stores data. Most disks are divided into platters/cylinders, tracks, and sectors, and sectors are grouped into clusters when formatted with a file system.
Hard disk formatting means preparing new space for data storage. This is by creating tracks and sectors in the disk.
formatting
formatting
That would be called low-level formatting.