B is a device to store and export data by using one or more rotating circular disk covered with magnetic materials. HDDs is a non-volatile memory, which means that the data stored in it will not be lost when the shutdown. the hard drive is a very important device in your computer because it is the place to store all of the information, the data of the person using the computer. Other devices such as RAM, mainboard ... can replace when damaged, but lost data due to hard drive failure are very hard to get it back.
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