Ans: D
The storage hierarchy is a ranking of storage devices based on several factors: access speed, capacity, cost per bit, and volatility.
- registers - fastest access, highest cost/bit, low capacity, volatile
- main memory - slower access than registers (faster than disks), lower cost/bit than registers (higher than disks), higher capacity than registers (lower than disks), volatile
- electronic disks - a.k.a. flash memory. slower access than main memory (faster than hard drives), lower cost/bit than main memory (higher than hard drives), higher capacity than main memory (lower than hard drives), nonvolatile
- magnetic disks - slower access than flash memory (faster than tapes), lower cost/bit than flash memory (higher than tapes), higher capacity than flash memory (lower than tapes), nonvolatile
ref: http://faculty.otterbein.edu/psanderson/COMP3400/notes/lecture01.html
In general, it's faster and easier to write data to magnetic storage media as compared to on optical media .
ref: https://www.techwalla.com/articles/difference-between-optical-magnetic-storage_