Answer
See explanation
Work Step by Step
In zoned-bit recording (ZBR), the disk is divided into concentric zones, with each zone containing a different number of sectors per track.
Outer tracks are longer, so they can hold more sectors than inner tracks.
The disk spins at a constant angular velocity, meaning the rotational speed is the same for all tracks.
Because more data passes under the read/write head per rotation on the outer tracks, the data transfer rate is higher for outer zones.
Conversely, inner tracks have fewer sectors, so less data passes under the head per rotation, resulting in a lower transfer rate.
In short: The data transfer rate varies across the disk because outer tracks are physically longer and contain more sectors, allowing more data to be read or written per rotation than inner tracks.
