Computer Science - 0478 CIE

Data Storage

Gbogbo ọrọ náà

A computer needs two very different kinds of memory: a fast workspace it uses right now, and a roomy cupboard where everything is kept when the power is off. Choose the wrong kind and your work vanishes when you switch off, or the machine grinds to a halt waiting for data. Knowing how each type of storage works lets you explain why a phone, a laptop and a games console make the storage choices they do.

In this lesson you will separate primary from secondary storage, learn how magnetic, optical and solid-state devices actually hold their bits, see how virtual memory rescues a computer when the RAM fills up, and weigh up the real advantages and disadvantages of storing your data in the cloud instead of on the device in front of you.

Ebumnobi

1 Understand what is meant by primary storage
2 Understand what is meant by secondary storage
3 Describe the operation of magnetic, optical and solid-state (flash memory) storage and give examples of each
4 Describe what is meant by virtual memory, how it is created and used and why it is necessary
5 Understand what is meant by cloud storage
6 Explain the advantages and disadvantages of storing data on the cloud in comparison to storing it locally

Akọmọ Ojú-ẹkọ

Every device you use has to balance speed, cost and how much it can hold. Fast storage is expensive and small; cheap storage is large but slow. Understanding the trade-offs explains why your computer has a small amount of very fast memory working with the processor and a much larger, slower store for your files, and why losing power loses your unsaved work.

Ọ dị na ngwa Green Bridge

Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.

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Ọ dị na Android, Windows, macOS, na Linux

Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Data Storage. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

Which statement about RAM is correct? A. it is non-volatile B. it stores the bootstrap permanently C. it is volatile and loses data when power is off D. the CPU cannot access it directly Answer: C
Which storage type uses pits and lands read by a laser? A. magnetic B. optical C. solid-state D. virtual Answer: B
A solid-state drive is preferred in a laptop mainly because it: A. has spinning platters B. has no moving parts C. needs an internet connection D. is a type of ROM Answer: B
Virtual memory is created using part of the: A. ROM B. CPU registers C. hard drive D. cache only Answer: C
One disadvantage of cloud storage is that it: A. cannot be shared B. needs an internet connection to access files C. is always slower than RAM D. is volatile Answer: B