MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -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-2: -A hard disc drive (HDD) is a non-volatile computer storage device that consists of rotating magnetic discs or platters. It is a secondary storage device used to store data permanently.

Detailed explanation-3: -Secondary storage (also called external memory or auxiliary storage) is a storage medium that holds data or information until it is deleted or overwritten if the computer has no power. That is, it stores data permanently for future use, for example, hard disk, floppy disk.

Detailed explanation-4: -CD-ROM, DVD-ROM, and BD-ROM refer to read-only optical storage disks. The data written on them is permanent and cannot be removed or overwritten.

Detailed explanation-5: -Hard disks can store up to 2TB (terabytes) of data, and are considered ‘fixed’ (permanent) drives as they cannot be removed from the computer unlike other storage devices.