Study notes on Technology Concepts for grade 11 and 12 level. These notes have been taken from various sources and are as per the examination guidelines. Each concept includes the definition and a description as well as the purpose and function of the concept and an explanation of how it works wher...
, Storage devices and media
1. Solid State Drive (SSD)
Definition / descption A storage device that has no moving parts making it silent more
robust than an HDD.
Operate much faster than traditional hard drives as they store
Purpose & function • quick access to stored program files & operating files
• store data, program files & operating system files
• improves general performance of computer & often used in
combo with hard drive
Explanation of how it works • uses microchips - no moving parts
• essential SSD components - host interface
(interface provided allow SSD communicate with driver)
• uses 'flash memory’ similar to RAM but non-volatile
(data not lost when power goes off)
• uses grid of electrical cells quickly send & receive data
Advantages / benefits • read/ write speed very fast = shorter boot time & better
performance than HHD
• less likely to get damaged - no moving parts
• silent - no moving parts ( becomes factor in data centre with
many hard drives
• flash memory to store data - not affected by magnetic
interface
• low power consumption
Disadvantages • more expensive than HHDs per GB of storage
( price gap becoming smaller in recent times)
• almost impossible data recovery from SSD
Limitations • wear out after using for long time - limited number of write
cycles
(data written to & erased from same place in flash
memory limited number of times)
• availability limited - may need to order in advance
Application in ICT envinment • found in smartphones, tablets, PCs
• standard for ultra-thin & high-performance laptop
computers) ultra-books
• preferable for workloads require high performance, quick
read / write speeds eg. Database applications
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