If you do a lot of work on your computer where you are required to write and delete data, then use a fast HDD for most tasks and SSDs for the most important ones. Read: Hybrid Drive vs SSD vs HDD.

GCSE Edexcel Computers - Edexcel Common types of secondary storage The CPU is the part of a computer system that runs programs and processes data. CPUs use the fetch-decode-execute cycle to do this.