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Example research essay topic: Floppy Disks Hard Disk - 1,111 words

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Keyboard The keyboard is used to input data into a computer by pressing the keys on it, the data maybe input into a verity of different applications from word processors to program generators. A keyboard has 102 keys on it as standard; these keys allow the inputting of numerical data, textual data and commands (By using the F or function keys) into specially designed programs. The character keys are what are used to input textual data, this maybe into a word processor or Internet order form. The arrow keys are used to move selected items around, this can be useful in a word processor so that the user can put the cursor in the correct place before they start typing. The number pad is used for inputting numbers.

In the case of a cash till system this would be used to key in card numbers or percentages for discounts. The function keys are used to make the execution of commands simpler. By assigning a certain key a property so that when it is pressed it brings up a menu it is possible to operate the whole system from these keys alone. The ESC or escape key is used to abort an instruction, this means if a user of a system accesses the wrong menu by hitting this key they will be able to leave this menu returning to the previous one.

Some keyboards have extras on them like www, back, forward, stop, refresh and volume keys. The manufacturer adds these additional keys to make everyday tasks simpler like surfing the web or adjusting the master volume. Display The display of a computer system is essential for the user to be able to see the output from the system. The monitor gives a visual representation for the user of the task they are performing in real time. If a program requires inputs visual messages can be displayed on the screen that the user can read and respond to. Without a display it is almost impossible for a human to use a computer for any good use.

Displays come on many different forms these all have their own benefits and drawbacks. The most common type of display is that of a desktop monitor. A desktop monitor will normally come as standard with all systems, the quality of the monitor is what makes the monitors different. The screen size can be as small as 8 inches up to and exceeding 32 inches, typically systems will have a monitor of around 17 inches. Refresh rate is also another major quality point; the simple rule is that the higher the refresh rate the better the image quality and less chance of health risks occurring like eye strain or migraines. A new variation of the standard CTR monitor is the LCD display, this is just the same as the CRT but it does not have much depth to it.

In other words its a lot lighter and takes up less space. Projectors are another way to display the output from a computer system, this is especially useful when presenting data to many people at once, such as at a meeting or conference. Projectors are very expensive so are not a standard display device. A CRT monitor a projector Mouse The mouse is used to move a floating cursor around on the screen of the computer system. This cursor can have various different uses including: Selecting Dragging Bringing up submenus And scrolling A mouse will have 2 buttons or more on them, these all have different uses.

The first mouse button will be used to selecting objects on screen (single click on icon) or executing a command such as start a program (double clicking on the icon). The second button on the mouse is used for bring up drop down menus that gives the user a list of commands that are associated with the item. Some mice have a third button that can be used in some programs for added ease of use. The scroll wheel is used to move pages displayed on the screen up and down without having to let go of the mouse or click on anything.

Disk drives Disks drives are used to store data on that the user requires to access at a later time, there are two types of storage, fixed and removable. Floppy This type of storage is always removable. Floppy disks are used in special drives that only have reading and writing hardware in them, the actual disk that the information is stored on is that of a removable disk. Floppy disks range in storage capacity starting as low as (now redundant) 400 kb on old 5 inch floppies, up to multiple gigabytes that the newer JAZ disks offer. All computer systems currently come with a removable disk drive, the standard is a 3 inch floppy disk drive of some sort. The 3 inch floppy disk has a storage capacity of 1. 44 Mb, this is a fairly small amount of storage in todays standards and is slowly being phased out by the newer ZIP disk format that is now becoming standard in most off the shelf machines.

Hard Hard disks are non-removable storage this means that the disk is permanently stored internally inside the machine. The capacity of a hard disk dive is much greater then that of a floppy disk. The capacity of a hard disk can range from as low as 50 mb up to around 120 gigabytes. The speed at which a hard disk drive runs at is far greater then that of a floppy disk. A hard disk will be able to write huge amounts of data in a short period of time compared to that of what a slow floppy disk can save in the same time span. The hard disk drive will be where the operating system and all the programs run under the OS will be stored.

Hard disk drives can be classed as permanent storage as they do not lose the information they house when the power supply is switched off. CD-ROM A CD-ROM is a drive that uses compact disks to save massive amounts of data like operating system or program installation files. A CD-ROM is a read only device, but this does not cause any problems as the reason for the drive is mainly for installing new software to the machine. Current CD-ROMs are running at around 52 X, this means that the spindle rotation speed is 52 times faster then that of the first CD-ROMs on the market. This high data transferee rate allows the execution of programs directly from the CD with out having to install an...


Free research essays on topics related to: hard disk, word processor, disk drives, storage capacity, floppy disks

Research essay sample on Floppy Disks Hard Disk

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