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What is an Operating System?
An operating system is programming which acts as an interface between the user of a computer and the computer hardware. The purpose of the operating system is to provide an environment in which the user may run software applications. The operating system enables the user to have the capability of using the computer's resources such as the CPU, memory, storage devices and printers.

The first hard drive
The first hard drive was created in 1956. It was called the IBM 305 RAMAC (Random Access Method of Accounting and Control), and was the first magnetic hard disk for data storage. It was designed for what is today called the 'main frame' class of large computers and required 50 24-inch disks to store 5 MB of data, a large amount of data in those days. The cost to lease this device at that time was approximately $35,000 a year.