A hard disk is divided into tracks which are further subdivided into: A. clusters B. sectors C. vectors D. heads E. None of the above

The correct answer is: B. sectors

A hard disk is divided into tracks, which are further subdivided into sectors. A sector is the smallest unit of storage on a hard disk. It is typically 512 bytes in size.

The other options are incorrect.

• A cluster is a group of sectors. It is the smallest unit of allocation on a hard disk.
• A vector is a quantity that has both magnitude and direction. It is not used to describe the division of a hard disk.
• A head is a component of a hard disk that reads and writes data from the disk platters.
• None of the above is a valid option.