The purpose of storage devices is to store data and software for later use
The purpose of storage devices is to hold data even when the computer is
turned off so the data can be used whenever needed/to have nonvolatile/permanent/backup copies of data/keep archives
Stored data may be loaded back into the CPU for further processing or sent
to an output device
The device writes data to the medium and reads it from the medium
The CPU is able to write data to the hard disk/tape in the form of formatted
files
The CPU is also able to read data and software from the hard disk/tape in
readiness for processing to take place
There is no distinction between software and data as far as the storage
device is concerned – both are a form of digital data
Optical devices such as CD, DVD and Blu-Ray drives all make use of a
laser to burn dark pits onto the medium
Each dark pit is a binary digit e.g. 1 whilst the absence of a pit is the
opposite binary bit e.g. 0 if the pit is a 1
Small areas of a tape/disk are magnetised to represent 1 or 0
Hard disks and magnetic tape have surfaces coated with a magnetically
sensitive material such as iron oxide
Solid state drives make use of electrical charge to store the data
Reading data involves retrieving data from the surface and transferring it
into the computer’s memory for use.
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