Data types * text * still and moving images * numbers * sound Input devices Keyboards · Most common type of keyboards is the qwerty keyboard · Another type of keyboard is a concept keyboard. They can be specially designed so that people with restricted vision can use them to interact with a computer. Most commonly programmed to perform common commands with one key. Point and click devices · Include mouse‚ tracker balls‚ touch sensitive pad‚ joystick‚
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the physical components of your computer such as the system unit‚ mouse‚ keyboard‚ monitor etc. The software is the instructions that makes the computer work. Software is held either on your computers hard disk‚ CD-ROM‚ DVD or on a diskette (floppy disk) and is loaded (i.e. copied) from the disk into the computers RAM (Random Access Memory)‚ as and when required. Types of Computers Mini and Mainframe Computers Very powerful‚ used by large organisations such an banks to control the entire business
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Lenovo User Guide Read the safety notices and important tips in the included manuals before using your computer. Notes • Before using the product‚ be sure to read Lenovo Safety and General Information Guide first. • Some instructions in this guide may assume that you are using Windows® 7 or Windows® 8.1. If you are using other Windows operating systems‚ some operations may be slightly different. If you are using other operating systems‚ some operations may not apply to you. • The
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Buyout Hard disk drives make up the largest sector of the information storage industry in 1999. The hard disk drive market can be classified into three separate categories‚ desktop‚ enterprise‚ and mobile. The mobile and desktop markets are expected to converge in the long run. While the desktop market represents approximately 58% of the $25 billion total hard disk drive market‚ enterprise margins were nearly double the margins in the desktop sector (10-15%). Since 1997‚ the number of disk drive units
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Question 1 ------------------------------------------------- When selecting a printer‚ what should you consider? ------------------------------------------------- Answer | | resolution (dots per inch) | | | speed | | | initial cost and cost of operation | | | all of the above | 1 points Question 2 ------------------------------------------------- System software refers to ------------------------------------------------- Answer | | application programs | |
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store instructions or data for a possible processing and its storage is temporally.it holds a list of instructions of an information that is currently working.it can be accessed randomly‚ it means that it does not have to look in the storage device (hard disk) from the start to find a piece of interest [23]. When we switch off the computer any storage within the RAM‚ will be erased that is why we say the storage is temporally. RAM is the main memory because we can quickly access any files in the
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the operational characteristics of most drives are similar. The basic components of a typical HDD are as follows (see Figure 9.9): ■ Disk platters ■ Read/write heads ■ Head actuator mechanism ■ Spindle motor (inside platter hub) Chapter 9 ■ Logic board (controller or Printed Circuit Board) ■ Cables and connectors ■ Configuration items (such as jumpers or switches) Hard Disk Platters (Disks) An HDD has one or more platters‚ or disks. Hard disks for PC systems have been available in several
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part of the operation system. The BIOS makes sure the components that all components are working properly it tests them all in the boot up and make sure it is properly connected. IDE Controller: An IDE controller is an interface what allows the hard drive to communicate with the motherboard; it is also a parallel device. SATA controller: A SATA controller is a more modern version the IDE controller accept it is a serial device. Power supply: A power supply is the power of the computer for example
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operating systems‚ and notably much easier to perform. Using Vista’s installation routine is a major benefit‚ especially for a server OS. Administrators can partition the system’s hard drives during setup. More importantly‚ they can install the necessary AHCI or RAID storage drivers from a CD/DVD or even a USB thumb drive. Thus‚ error-prone floppies can finally be sent to the garbage bin. Windows Server 2008 can also be installed as a Server Core installation‚ which is a cut-down version of Windows
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Video 1.06 Storage Devices Hard Drives Hard drives are comprised of platters Read/Write heads for each platter Read and write on top and bottom of platter Never exposed to magnets Data loss may occur 137 GB Limit Hard Drive size limited to 137GB Not a physical limit Limited by address the system can support 28 bit communications limited to 268‚435‚555 addresses equates to 137 GB Flash BIOS to upgrade hard drive interfaces PATA‚ SATA‚ SCSI‚ USB‚ and FireWire most common is the
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