Disk Performance
To read or write, the disk head must be positioned at the desired track and at the beginning of the desired sector.
The access time to data can be broken down into 2 parts:
- Seek time: Time it takes to position the head at the desired track
- Rotational delay or rotational latency: Time its takes for the beginning of the sector to reach the head
seek time + rotation delay = access time time required for transfer of data = transfer time