A-Fixed-Head disk, B-Movable-Head disk, 1- One head per track and al head are mounted on rigid arm that extends across all tracks. 2- Only one head and head is mounted on the arm, such that it can position the track.

• A. A – 1, B – 2
• B. A – 2, B – 1
• C. A – 1, B – 1
• D. A – 2, B – 2