define hard disk.....
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Answer:
A hard disk drive (HDD) is a non-volatile computer storage device containing magnetic disks or platters rotating at high speeds. It is a secondary storage device used to store data permanently, random access memory (RAM) being the primary memory device. Non-volatile means data is retained when the computer is turned off.
A hard disk drive is also known as a hard drive.
⭐It is one of the most useful and popular storage devices.
⭐A hard disk pack consists of a number of rigid circular metallic plates coated with iron oxide.
⭐ These circular plates are mounted on the common spindle and this pack is rotated at a high speed.
⭐The disc surface contains circular parts called tracks. Each track is further divided into sectors and form clusters when combined.
⭐The data is recorded on the disks through the read write head, which resembles a record player.
⭐ The information that comes from the CPU is recorded digitally on the disk surface through the read write head.
⭐Also , the information is retrieved digitally from the disk through the read write head to the computer system for further processing.
⭐Generally , the storage capacity of the hard disk is 500 GB or more.