Operating System Concepts

The course will introduce with different aspects of Operating System.

This section will try to give basic operations of an operating system.

Solid-state disks have several variants but in general are faster than magnetic disks and are nonvolatile. One type of solid-state disk stores data in a large DRAM array during normal operation but also contains a hidden magnetic hard disk backup power.

Idea of operating System

First Operating System

Solid-state disks have several variants but in general are faster than magnetic disks and are nonvolatile. One type of solid-state disk stores data in a large DRAM array during normal operation but also contains a hidden magnetichard disk and a battery for backup power. If external power is interrupted, thissolid-state disk’s controller copies the data from RAM to the magnetic disk.When external power is restored, the controller copies the data back into RAM.Another form of solid-state disk is flash memory, which is popular in camerasand personal digital assistants (PDAs), in robots, and increasingly for storageon general-purpose computers. Flash memory is slower than DRAM but needsno power to retain its contents. Another form of nonvolatile storage is NVRAM,which is DRAM with battery backup power. This memory can be as fast asDRAM and (as long as the battery lasts) is nonvolatile.

What was the first operating system?