1.2 Memory & Storage - Secondary storage, Slides of Computer science

Download 1.2 Memory & Storage - Secondary storage and more Slides Computer science in PDF only on Docsity! 1 1.1: System architecture The CPU 1.2 Memory & storage Se ondary storage • Understand the purpose of secondary storage • Explain the different considerations needed when deciding on suitable secondary storage devices Secondary storage 1.2: Memory & storage Secondary storage / memory • What is secondary storage? • What is the purpose of secondary storage? MAIN MEMORY SECONDARY STORAGE CENTRAL PROCESSING UNIT (CPU) INPUT DEVICES OUTPUT DEVICES Secondary storage 1.2: Memory & storage External & Internal storage? • What is it? • What is the difference? Secondary storage 1.2: Memory & storage Internal storage • Hard disk is the most common type • Needed to hold the operating system and applications software • Faster access than external storage Secondary storage 1.2: Memory & storage External storage • Stand alone device that is separate to the computer • Portable • Can be used to back up internal data Examples: Portable hard disks, magnetic tape, memory stick/flash drive, memory cards, DVD’s, CD’s An introduction to ROM & RAM 1.2: Memory Types of hard disk drive • Internal Hard Disk • Inside a PC as secondary storage • Portable Hard Disk • Supplementary storage for a PC or portable storage where high capacity is required An introduction to ROM & RAM 1.2: Memory Solid State Drives • No moving parts • More reliable so less susceptible to shock and damage • Lighter than HDD (used for laptops, tablets) • Faster access times, data can be accessed instantaneously • Lower power consumption • Run cooler than HDDs An introduction to ROM & RAM 1.2: Memory • Compare and contrast the difference between a HDD (Hard disk drive) and SSD (Solid State Drive) • Think about capacity/reliability/portability/speed Task 3: