You are watching: What kind of data can be lost when a computer is turned off
If the normal tough drive make papers on overwriting setting when they obtain deleted what happens through RAM once I shutdown my computer system does they just disappear to the air? Or what?
It is because that the same factor that once you eliminate power from an LCD display screen that it will certainly go black. The exact same as a light bulb and millions that other electric devices. Because in order come do work-related such as giving light or motion or save on computer data they need a consistent flow that electricity.
Once that flow is interrupted then the process that does the work will stop and also the state that was being kept by the electric existing will stop as well.
The state the a bit of ram requires consistent application of electric energy to retain state, otherwise the state is lost. The tools are said to it is in "volatile". This is a feature of fast switching electronic devices.
But you speak that hard drives carry out not loosened data when power is removed. Tough drives, SSDs and also the prefer require power to change the state the bits of data. Left without power the data will not change. This is because of the means the data is stored.
In difficult drives the work is excellent by forcing the magnetic field in an material to flip direction, in much the same way as you have the right to magnetise a needle by rubbing it v one finish of a magnet. The needle will have a magnetic field that is aligned depending upon which end of the magnet girlfriend used. You have the right to remagnetise a needle using the various other side the a magnet and it will certainly flip the direction of the magnetic field. This change in magnetic field is, for every intents and purposes, permanent until work is excellent to change it.
This adjust in magnetic field is a adjust to the basic material and is a attribute of how we store data ~ above "non-volatile" media like hard disks. SSDs occupational differently. By trapping electrons in one area that circuitry they store bits of data but it still requires job-related to do a physical adjust to the value of the data.
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The difference between the two is the one method of save data provides power come hold the data, the other provides power come force a physical change in a material.
But this two methods have various benefits. Making use of power to hold data in volatile devices enables those gadgets to be changed much more quickly, up to millions or billions of time a second, if non-volatile gadgets are far slower due to the physical nature the the transforms that happen.