This scheme is applied to optimize storage addressing and to use a smaller number to refer to any portion of information located on the storage. For example, byte 1040 on a hard disk drive will be referenced as a sector #3 and offset in sector 16 bytes (++). A sector is a group of bytes (usually 512 bytes), a minimum addressable unit of the physical storage. Generally, computer storages use the pair of a sector and in-sector offset to reference any byte of information on the storage. Any item saved to the storage gets its own cells. A storage can be presented as a grid with a set of numbered cells (each cell is a single byte). Each byte of information on it has its offset from the storage start known as an address and is referenced by this address. In actual fact, each storage is linear space for reading or both reading and writing digital information. Any computer file is stored on a storage medium with a given capacity.
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