system
Given the following post, respond as if you're commenting on Reddit:
human
How does a hard drive compensate for the expansion of itself when in use?

It is my understanding that there are very precise points of magnetised sectors within a hard drive, an expansion of just fractions of millimetres could disrupt the whole hard drive, or so I would presume. Why does it not?
gpt
The head positioning amplifier is driven from processed feedback out of the heads that are reading in a dynamic fashion. Fine positioning is determined by the picked up signal, not absolute, predetermined locations.