|Do you have a problem with your hard drive currently?|
You haven't provided any specs.
If you have a laptop then your habits may be more detrimental to the hard drive due to heat. Running those operations certainly places additional stresses on a mechanical hard drive. SSD hard drives have a finite number of read/ write cycles due to the nature of the device. The number is large but it does exist.
It is not necessary to run scandisk or defrag that often. The percentage of free space on your drive factors into whether you need to defrag. Use the analyze function before defragging. Defrag won't run if the free space is less than 15%.