In terms of physical protection, the M.2 SSD cover can prevent dust, dirt and other sundries from entering the M.2 slot, thus reducing the risk of SSD damage. In addition, it can also prevent electrostatic discharge caused by accidental collision or touch, and protect the circuits and connectors of the solid-state hard disk.
In terms of heat dissipation, some M.2 SSD covers are designed with cooling fins or cooling holes, which can help to dissipate heat and reduce the temperature of SSD. This is especially important for solid-state hard disks that are used with high load for a long time, because high temperature may affect their performance and life.
Generally speaking, the cover plate of M.2 SSD plays a certain role in protection and heat dissipation. However, whether you need to use a cover depends on your specific situation and needs. If your computer environment is relatively clean and the temperature of SSD is within the normal range, it may not be necessary to use the cover. But if you are worried about the safety or temperature of the SSD, using the cover is a good choice.