Figure 2.8 The Windows XP Task Manager

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 Manage the storage and retrieval of information and
 Provide a common, easy to navigate system for viewing and accessing storage devices and the information stored on them. Well take a closer look at file system management in Unit 6 Unit Summary Computerized devices need an operating system to control the actual functioning of the device. Whether the device is a personal computer, mobile phone, or computerized aircraft controls, an operating system must provide someway for the user to interface with the device. Modern operating systems use a graphical user interface approach to simplify access to applications and hardware resources. Operating systems act as one layer in the functioning of a device. Other layers include the hardware, applications and the user. It is possible to install more than one operating system on a computer, which creates multiple sets of layers (however, only one of these sets of identical layers can operate at any given time. It is also possible to use virtualization to simulate the use of two different operating systems at the same time. Regardless of which operating system is being used, there are similar tasks that the operating system must perform. The primary tasks performed by the operating system include the management of CPU scheduling and tracking processes, memory management, management of
Input/Output systems and file system management. Key Terms Applications BIOS Blackberry OS Bootstrap loader
Client-server model Command Line Interface Command Line Interpreter Cooperative multitasking Device drivers DOS Early Kernel Initialization EXT FAT 16 FAT 32 File system Full Kernel Initialization Graphical User Interface
HFS+ Kernel mode Layers Linux Master Boot Record (MBR) Max OS X Mode Multitasking
Multithreading
NTFS Operating system Palm OS Partition
PDA Preemptive multitasking Process Process state Process Table Protected mode pSOS
QNX Real mode Special purpose operating system
Symbian System call System software UNIX User mode Virtual computer Virtualization Voltage good line
VxWorks Windows Mobile

Operating System Fundamentals
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