What hard drive types are there?

Hard drive, memory and processor – these are the three most important components of a computer. The hard drive serves as the main memory: Data is stored here for the long term so that it can be accessed again at a later point in time. One of the main requirements for a computer’s main memory is therefore its capacity, which can be up to two TB, that is 2,000 GB. There’s room for hundreds of movies, music files and more on such a large hard drive.

A storage consists of one or more aluminum discs. These can be magnetized in places by means of an electric charge. When data is written to the hard drive, the read/write head moves to the next free space on the platter and writes the data by applying an electrical charge to the aluminum disc. If the processor requests data to be read, the reading head moves to the appropriate position and determines the bit sequence: Zeros have a negative charge; Ones are positively charged. The speed at which the aluminum disks spin affects the read and write speeds of a hard drive; this in turn is decisive for the speed of the entire computer. Standard is SATA storage with up to 7,200 revolutions per minute. More powerful SAS hard drives can spin up to 15,000 revolutions per minute, but are mainly used in high-performance computers and servers.

There are different sizes of hard drives. Standard for notebooks are main memories in 2.5″ format. Desktop computers mainly use 3.5″ hard drives. The following applies: the higher the storage density, the more expensive the hard disk. A small memory with 500 GB capacity is more expensive than a large one with the same memory.

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