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‚
Premium Hard disk drive Computer Computer software
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
Premium Hard disk drive Leveraged buyout Stock market
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
Premium Computer Personal computer Hard disk drive
access time is required for accessing information from any storage location Suitable for direct processing applications such as on-line ticket booking systems‚ on-line banking systems Magnetic‚ optical‚ and magneto-optical disks are typical examples of such a storage device Best example to differentiate b/w sequential and direct access is the audio cassette and compact
Premium Floppy disk Computer data storage Hard disk drive
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
Premium Operating system Hard disk drive Computer data storage
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 | |
Premium Computer Personal computer Computer data storage
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
Premium Hard disk drive Floppy disk
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
Premium Serial ATA Hard disk drive Floppy disk
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
Premium Computer Computer data storage Personal computer
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
Premium Hard disk drive Memory card Floppy disk