OCR Cambridge Technicals Level 3 IT: Unit 2 (Global Information) Revision Notes

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  • Created by: Looronh
  • Created on: 10-03-17 11:58

Unit 2 Revision Notes

Holders of Information

Examples are individual citizens, businesses, educational institutes, governments, charities, and health care services.

Storage Medias

USB- Device that includes flash memory with an integrated USB interface.

  • Removable and rewritable.
  • Smaller than optical disks (CD’s and DVD’s)
  • Lasts at least ten years.
  • Used for data backups and transfer of computer files.
  • Small, faster, more capacity, and more durable due to no moving parts.
  • USB’s with USB 2.0 support can store more data and transfer faster than much larger optical disc drives like CD-RW and DVD-RW drives. They can be read by many handheld devices such as smartphones and tablets but an SD card is better suited for this.
  •  Flash drive consists of small printed circuit with is protected and insulated electrically by the plastic, metal or rubberised case.

Hard drives

  • Used for storing and retrieving digital information using rigid rapidly rotating disks coated with magnetic material. These are paired with magnetic heads arranged on a moving arm which reads and writes data to the disks surface.
  • Data is accessed in a random manner meaning individual blocks of data can be stored or retrieved in any order.
  • It has a non-volatile memory so it retains the stored data even when powered off.
  • Its capacity is measured in TB’s or GB’s. However, some capacity is unavailable to the user because it’s used by the file and operating system of the computer.
  • Data retrieval time depends on where the data is stored.

Cloud storage

  • Digital data that is stored in logical pools in multiple servers.

Advantages

  • Companies only need to pay for the storage they actually use.
  • Organisations can choose between off-premises and on-premises cloud storage options.
  • Storage availability and data protection is paramount to cloud storage companies, so depending on the application, the additional technology, effort and cost to add availability and protection can be eliminated.
  • Storage maintenance tasks, such as purchasing additional storage capacity, are offloaded to the responsibility of a service provider.
  • Cloud storage provides users with immediate access to a broad range of resources and applications hosted in the infrastructure of another organization via a web service interface.
  • Cloud storage can be used as natural disaster proof backup, as normally there are 2 or 3 different backup servers located in different places around the globe.

Network Storage

  • This is a storage serves connected to a computer network providing data access to a large group of clients.
  • Removes the responsibility of file serving from other servers on the network.
  • Use network file sharing protocols to allow clients access.
  • It has faster data access, easier administration and simpler configuration than general purpose servers.

Solid State Drives

  • These have no moving parts and all data is retrieved at the same rate no matter where it is stored.
  • They don’t rely on magnetic properties.
  • Store data by controlling the movement of electrons with NAND chips.
  • Data is stored as O’s and 1’s in millions of tiny transistors within the chip.
  • Has a non-volatile memory that is…

Comments

Looronh

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Incomplete - Will be updated soon.

rherbert

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Great, thanks! Looking forward to the complete version.

Looronh

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amaadc

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Do you think you could make one for the cambridge technical level 3 IT unit 1 fundamentals of IT? Also, could you make one for the cambridge technical level 3 business, the business environment?

danielnk

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I agree with amaadc

Looronh

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I was too busy to create any other resources as I was revising for my exams and my revision was on paper not electronically produced like these notes. Sorry! I will be making revision guides for unit 1: Fundamentals of IT, unit 3: Cyber Security and the AQA AS Level Graphic Products exam over the summer for anyone who is doing those subjects next year or any retakes :)

KingDigweed

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maybe you could come round mine but idk ;)

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parents are still home I'm free at 11:22

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ya ya ya Newcastle

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yes kid hahahh u seen the game ahha          

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hi

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Human Comedy < 20188

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haah

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