COMPUTER FUNDAMENTALS

Detailed explanation-1: -Either magnetic or optical storage media are used for most storage systems. The hard disk is an example of secondary storage and magnetic media, which is used for storing data and programs in bulk. Hence, Option 4 is correct.

Detailed explanation-2: -Optical storage differs from other data storage techniques that make use of other technologies such as magnetism, such as floppy disks and hard disks, or semiconductors, such as flash memory. Optical storage in the form of discs grants the ability to record onto a compact disc in real time.

Detailed explanation-3: -hard disk, also called hard disk drive or hard drive, magnetic storage medium for a computer. Hard disks are flat circular plates made of aluminum or glass and coated with a magnetic material. Hard disks for personal computers can store terabytes (trillions of bytes) of information.

Detailed explanation-4: -Hard disks are nonvolatile storage devices that are used to store and retrieve data quickly. Nonvolatile storage is physical media that retains data without electrical power. This means that no data is lost when the computer is powered off, making hard disks suitable for permanent storage of information.

Detailed explanation-5: -Yes hard disk is a permanent storage device.