In this video from ITFreeTraining, I will have a look at storage devices. Storage devices are what hold our customers’ data. Our customers rely on this storage to help keep their data safe. Loss of data may result in lost productivity, or the work may never be able to be recovered; thus, it is important to keep it safe.
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Hierarchy of storage
Before I start having a look at storage devices, I will first have a look at the hierarchy of storage. Understanding this will give you an idea of what you are trying to achieve with each of the different storage types.
To start with, I will look at primary storage. Primary storage is used to run software and store data that the computer needs to access quickly. There is a small amount found in the CPU in the form of registers and cache. Registers are small amounts of data that are used by the CPU for calculations. Cache is a fast second copy of some of the computer’s memory, used to improve performance.
This memory may be fast; however, when the power is switched off, the data is lost. Thus, this storage is often referred to as volatile.
The next storage I will look at is secondary storage. Secondary storage is in the form of your hard disk drives, optical drives, and flash drives. Essentially this is storage that is easily accessible by the computer. Even if the storage is not always online, such as a CD-ROM or flash drive, it is still easily accessible very quickly.
The advantage of this storage is that it keeps its data when the power is switched off. Also, price wise, this storage costs less than primary storage does. So, essentially, you can have more of it compared with primary storage. The disadvantage is this storage is slower than primary storage.
Since secondary storage is slow compared with primary storage, it is difficult to work with directly and so will generally be swapped in and out of the computer’s memory as required.
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References
“The Official CompTIA A+ Core Study Guide (Exam 220-1001)” Chapter 6 Paragraph 84-91
“CompTIA A+ Certification exam guide. Tenth edition” Page 289
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“Picture: Blu-ray disc” [ Ссылка ]
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Credits
Trainer: Austin Mason [ Ссылка ]
Voice Talent: HP Lewis [ Ссылка ]
Quality Assurance: Brett Batson [ Ссылка ]
