Most of the system disk slimming operations are to delete things that are not used at all, such as sample music. The only thing that may cause problems is to transfer virtual memory, but this can be restored at any time.

As for the damage to the hard disk, let's just say that every reading and writing will cause damage to the hard disk, but this damage is very limited. As long as it is not violent vibration or high temperature and humidity, the life of the hardware can be guaranteed.