Why do all-in-one machines need to focus on cooling the hard drive?

In many all-in-one computers, we can see that a fan has been specially added next to the hard drive to assist in heat dissipation. How can hard drives that are not given special attention in laptops enjoy such high standard treatment in all-in-one computers? The key point of the answer is that the hard drive is different. For laptops, they use 2.5-inch hard drives with power consumption typically only ranging from 2W to 3W. However, hard drives are often burdened with the accusation of baking wrist rests and affecting user experience. Relatively speaking, all-in-one computers have more space advantages than laptops, with sufficient space for installing hard drives. In addition, the 3.5-inch hard drive performance of desktop computers is much higher than that of laptops' 2.5-inch hard drives, and the price is also much cheaper. In this case, the vast majority of all-in-one computers use 3.5-inch hard drives, which can consume up to 10 watts of power. In the overall compact structure of all-in-one computers compared to traditional desktop computers, it is difficult to rely on free heat dissipation to maintain low temperature and stability. Therefore, the hard drive has become one of the key cooling components for all-in-one machines, and all-in-one machines have to add a cooling fan specifically for the hard drive.