1.3 Input, Output & Storage
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What are some examples of input devices?
keyboard mouse webcam magnetic stripe reader (card reader) barcode reader
What are some examples of output devices?
speakers monitors printers headphones
What are 3 categories of storage?
optical magnetic flash/solid state
What is optical storage?
Storage that is read from and written to using lasers. Recessed areas called PITS scatter light to represent 0. Flat portions called LANDS reflect light to represent 1.
What are 3 types of optical storage?
CDs DVDs blu-ray discs
What does CD stand for and what do they typically store?
compact discs used for storing songs, images and text
What are the advantages of CDs?
small/thin/light - portable cheap
What are the disadvantages of CDs?
very low capacity easily damaged by scratches slow read/write speeds
What is the difference between DVDs and CDs?
DVDs have higher storage capacities so they are typically used for storing videos/movies.
What is the advantage of blu-ray?
Good for high resolution films as has up to 5 times the storage space of traditional DVDs.
What is magnetic storage?
Devices that represent binary information using 2 magnetic states: polarised and unpolarised (1 and 0). Polarised magnetic material contains aligned magnetic poles whereas unpolarised material has poles pointing in scattered directions.
What are 3 types of magnetic storage?
hard disk drives magnetic tape floppy disk
What are the advantages of HDDs?
high capacities cheap per gb
What are the disadvantages of HDDs?
slower read/write speeds than solid state storage less portable easily damaged because of moving parts
What are the advantages of magnetic tape?
high storage capacity durable cheap per gb
What are the disadvantages of magnetic tape?
slower access speeds only accessed sequentially heavy noisy sensitive to physical damage
What is magnetic tape used for?
audio files video files
What are the advantages of floppy disks?
very small portable cheap good for storing text documents
What are the disadvantages of floppy disks?
lack of durability low capacity
What are the 2 main flash storage devices?
solid state drives USB sticks
What are the advantages of USB sticks?
fast read/write reliable portable good price
What are the disadvantages of USB sticks?
easy to lose low capacity
What are the advantages of SSDs?
light and portable can have high capacities no moving parts - durable fast read/write speeds reliable
What is the main disadvantage of SSDs?
more expensive per gb than HDD