It depends on how you define fragile, glass is fragile, rubber is not easily broken but easily deformed. To say that it is fragile, it is not at all, the key is to see how you want to destroy it. Generally speaking, the synthetic materials of mechanical hard disks are aluminum alloy and stainless steel. In the more than ten years I have been in contact with and helping people repair computers, I have never seen the platters of mechanical hard disks cracked or deformed. The hard disk is mainly composed of a disk body, a control circuit board, and interface components. The disk body is a sealed cavity. The internal structure of the hard disk usually refers to the internal structure of the disk body; the control circuit board mainly includes the hard disk BIOS, hard disk cache (ie, CACHE), and the main control chip. There is a vent hole on the surface of the hard disk, its function is to keep the internal pressure of the hard disk consistent with the external atmospheric pressure. When the disc body is sealed, the vent hole communicates with the disc body through a high-efficiency filter to ensure that the disc body is clean and dust-free. In fact, the most common cause of hard disk failure is that the head touches the rotating disk shaft, rather than the disk being broken or deformed. It is based on the internal structure that we are talking about, if the hard disk vibrates greatly when it is working, the drive will be impacted when the disk is maintained at a speed of 5400 or 7200 rpm, and the head may physically hit the disk. It’s like the 747 broadcast landing on the tarmac, but without the landing gear. At this time, when you check the disc, even if it is not shattered, it will be particularly prone to scratches on the disc due to the aluminum material, and the disc head and disc may be damaged, and may cause permanent damage to the head. Even if the head here is not damaged, the scraped particles need to be filtered out by the internal air filter, otherwise these particles are likely to enter other heads and disks and cause greater damage. Continue to run such a hard disk, it is easy to cause irreversible loss of data. Another common failure mode is that the motor inside the disk cannot operate normally. For example, if the lubricating oil becomes hard or the oil is not regularly lubricated, it will increase the friction between the head and the disk and eventually make our motor unable to operate. In addition, Xiaoming wants to emphasize one point: Mechanical hard disks are not well resistant to shock and vibration. Any mechanical hard disk is recommended to be used or read and written in a non-vibrating state. After all, when the hard disk is running, the internal speed is very high and it is very fragile. The hard disk basically has no effect, so bumps and bumps in the car will not damage the hard disk, but if the frequency is too much or too much force, it may cause the hard disk to be damaged (simply shaking the hard disk by hand, theoretically not impossible). Here, by the way, a mouthful of solid state drives. The physical composition of SSD is basically flash memory + main control + cache + PCB + interface. There are no mechanical parts, and data reading and writing are all electronic signals. There is no bottleneck factor such as motor speed, and it can withstand more than traditional disk drives. Shock and vibration, so in terms of reliability and fragility, SSD is much better than mechanical hard drives. It is for this reason that many of today’s computers are basically solid-state and solid-state.