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Backing Storage (OPTICAL: stores data by means of lasers 'burning'…
Backing Storage
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MAGNETIC: uses magnetic fields to store the data, floppy disks/hard disk drives, magnetic tapes.
HARD DISK DRIVES: they are usually stored inside a computer. They use disks of metal which are magnetically charged. These are read by small head-like a record player which moves over the disks.
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MAGNETIC TAPES: they are the same as music tapes. To access a file you have to sequentially go through every file. They are cheap and are used for backups.
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Portability: Very portable, requires another drive
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Types of access
SEQUENTIAL ACCESS: to go from file A to file Z in a sequential access system, you must pass through all files in order. It is sometimes called serial access.
DIRECT/RANDOM ACCESS: refers to the ability to access data at random. In a random access system, you can jump to file Z.
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SOLID STATE: uses no moving parts at all, uses memory chips e.g. USB Drives, SSD Hard Drives.
USB FLASH DRIVES: USB (Universal Serial Bus) uses memory chips to store data. This means they are very robust.
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Portability: Very portable, requires another drive
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It is used to PERMANENTLY save information because information is lost in the RAM. There are 3 main types: Magnetic, Optical, Solid State.