A device driver is a software program that enables a specific hardware device to communicate with the operating system (OS) of a computer.

When a new hardware device is installed in a computer, the OS typically doesn't have the necessary information to communicate with the device. This is where device drivers come in - they provide the OS with the information it needs to communicate with the device, including instructions on how to use the device and how to access its functions.

Device drivers are specific to each type of hardware device and are usually developed by the manufacturer of the device. The driver software typically needs to be installed on the computer before the device can be used.

A partition is a smaller division or section of a hard disk that is created to allow for the organization and management of data on the disk.

When a hard disk is partitioned, it is divided into one or more sections, each of which functions as a separate volume with its own file system. This allows users to organize their data more effectively and to allocate space on the disk according to their needs.

For example, a user might create separate partitions for their operating system, programs, and data files. This can help to prevent data loss in the event of a system failure or virus attack, as well as make it easier to back up and restore data.

The CMOS setup utility is a software program that is built into the firmware of a computer's motherboard. It allows users to configure various settings related to the computer's hardware and system setup. The CMOS setup utility is typically accessed by pressing a specific key during the boot process of the computer, which may vary depending on the motherboard and BIOS version.

In many cases, the key used to access the CMOS setup utility is the Delete (Del) key. When the computer is starting up, users can press the Del key to enter the CMOS setup utility and configure settings such as the system clock, boot order, memory settings, and other hardware-related settings.

Formatting a hard drive is a process of deleting all the data on it. When a hard drive is formatted, all the files and data on the drive are erased and the file system is set up to prepare it for new data to be written to the drive.