INTRODUCTION OF HARD DISK

Hard Disk is the primary computer storage medium, which is made of one or more aluminum or glass platters, coated with a ferromagnetic material. Although the terms "hard disk" and "hard drive" are used synonymously; technically, the disk spins inside the drive.

All computers used to have an internal hard disk for storage; however, today, storage can be solid state. External hard disks can be plugged into USB or a eSATA port for more storage.Hard disks are "fixed disks," which means the platters reside permanently in the drive. In the past, removable cartridges for backup and transport contained the platters.

Hard disks are not the computer's main memory. Disks store programs and data until deliberately deleted by the user, but memory (RAM) is a temporary workspace.