SSD vs HDD
The traditional spinning hard drive (HDD) is the basic nonvolatile storage on a computer. That is, it doesn’t “go away” like the data on the system memory when you turn the system off. Hard drives are essentially metal platters with a magnetic coating. That coating stores your data (music, documents, videos, application files). A read/write head on an arm accesses the data while the platters are spinning in a hard drive enclosure.