Computer electronics tend to be small and thin that may reach high temperatures sometimes. According to the computer specifications, it highly relies upon the flexible PCBs for better operation.
The hard drive components should be flexible enough to sustain the maximum speed for data writing and other tasks that are comparatively small and thin.
Longer operating time makes the hard drives turn to hot which also requires having another board with the ability to withstand high temperatures.
In the hard drives, these are often credited by enabling a long-lasting solution.
Not only in the computer the flexible PCBs are also working great for other consumer electronics like televisions, gaming systems, printers, and microwaves.