These are devices which store data in an external hardware such as a hard drive or USB.
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File compression
This is a way to reduce the size of files, it is called compressing. Compressing is commonly used on images,sound and video files, this is because of the size of them. An example of this is a TIFF file which uses up much less space than a JPEG.
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Advantages of file compression.
The main advantage of compressing a file is the fact that it reduces in size, this means that it uses up less space on hard drives. Another advantage of this is that it is quicker to upload as the amount uploaded is reduced. There are many more.
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Disadvantages of file compression.
Compressing files have a low amount of disadvantages but the main ones have to be the reduction in quality (resolution) of the compressed files. As well as the fact that it is hard to view the information in compressed files.
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Types of storage.
There are two types of storage, internal and external. Examples of internal storage are BIOS chips and ROM. These are used when the computer starts up, without these the operating system cannot be loaded. External storage devices are USBs.
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Magnetic Storage.
Hard drives and floppy disks use magnetic storage, this is through storing data on magnetised surfaces.
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Hard disks.
Most storage on computers are stored on hard drives, this is a device which is made up of a rotating disk or metal disks that are covered with magnetic coating. These can be external or internal, they are the main part in a RAID setup.
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Floppy discs.
These used to be a popular method of storing data, although because they can only store 1.44MB of data it means it is no longer practical. They are easily damaged and not very reliable which is another reason for them no longer being used as often.
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DAT tapes.
These are tapes which are small in size but can hold a lot of data. They are often used to back up servers because they can easily be taken to other locations. Although they are quite slow to write to and are very slow to retrieve data.
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Optical storage.
These use optical technology to etch data onto a plastic coated metal disc. These can hold around 4.7GB of data. CD-ROMs are read only, this means they cannot be editted. CD-Rs, these can have data written on them once. CD-RW, They can be written on.
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Flash memory.
These are small in size and are portable. It uses solid state technology so they are more reliable (since they do not have moving parts).
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Online storage.
The increased upload and download speed in recent years have made this more practical. This way of storage are things such as the cloud and any online storage media, this can be used anywhere as long as you have an internet signal.
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Other cards in this set
Card 2
Front
This is a way to reduce the size of files, it is called compressing. Compressing is commonly used on images,sound and video files, this is because of the size of them. An example of this is a TIFF file which uses up much less space than a JPEG.
Back
File compression
Card 3
Front
The main advantage of compressing a file is the fact that it reduces in size, this means that it uses up less space on hard drives. Another advantage of this is that it is quicker to upload as the amount uploaded is reduced. There are many more.
Back
Card 4
Front
Compressing files have a low amount of disadvantages but the main ones have to be the reduction in quality (resolution) of the compressed files. As well as the fact that it is hard to view the information in compressed files.
Back
Card 5
Front
There are two types of storage, internal and external. Examples of internal storage are BIOS chips and ROM. These are used when the computer starts up, without these the operating system cannot be loaded. External storage devices are USBs.
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