Define "Address" in data storage or data access

Define Address - What is "Address "
Address
A specific physical location where a unit of data is stored. To enable the system to return to the same area on a disc, each area is given a unique address consisting of three components: cylinder, head, and sector. Cylinder addressing is accomplished by assigning numbers to the disc’s surface concentric circles (cylinders). The cylinder number specifies the radial address component of the data area. Head addressing is accomplished by vertically numbering the disc surfaces, usually starting with the bottom-most disc data surface. Sector addressing is accomplished by numbering the data records (sectors) from an index that defines the reference angular position of the discs. Index records are then counted by reading their address marks. For example, the controller might send the binary equivalent of the decimal number 610150 to instruct the drive to access data at cylinder 610, sector 15, and head 0.