• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Storage devices in terms of computers.

Extracts from this document...

Introduction

There are two types of storage systems in terms of computers: > Primary storage: is the storage provided by memory in a computer > Secondary storage: storage provided by peripheral devices other than memory Primary storage: Memory - The amount of memory in a computer system determines the level of complexity of task that the system can handle. A single unit of memory is called a bit. A bit can store 0 or 1. Eight bits together are called a byte. Memory, and data storage capacity is usually measured in larger units. There are two classes of memory in a computer system: > Ram: (random access memory) > Rom: (read only memory) RAM is memory that can be both read and written to. It is used for storing data and programs while the computer is being used. Most RAM is volatile, i.e. it can only hold data while power is supplied to the computer. Once the power is turned off the contents of ram are lost. System settings such as date and time are stored in CMOS (complementary metal oxide semiconductor) RAM. CMOS RAM has a battery to keep the data. ...read more.

Middle

They consist of a single removable drive with the same diameter of a standard floppy disk (3.5inches) The zip disks looks like a standard floppy disk, however it is much faster. The typical storage amount of a zip drive is 250mb. Its transfer rate is around 1.7Mb per second. Hard Drives: The hard drive is the main storage device of a computer. Your applications, games and everything else are stored here. Hard drives are big, fast and are stored onto the computer. The speed at which your computer boots up and programs loads is totally related to the performance of your hard drive. They are more secure and reliable than floppy's. Hard disks hold more data and are faster than floppy disks. A hard disk, can store anywhere from 10 to more than 100 gigabytes, whereas most floppies have a maximum storage capacity of 1.4 megabytes. The hard disk is capable of holding large amounts of data and it has a very high data transfer rate. Floppy Disks: Floppy disks are an important type of storage device. They have a low storage capacity (1.44mb), which means they are only suitable for transferring small files between computers as well as providing a back up for word-processing documents. ...read more.

Conclusion

CD-RW is a type of CD disk that enables you to write onto it in multiple sessions. CD-RW drives are readable and write able. This means that the information written on them today can be overwritten with new information tomorrow. Also, they can be read by any CD-ROM drive. CD-RW drives are very important because they allow you to share large amounts of data with other people. With CD-RW drives and disks, you can treat the optical disk just like a floppy or hard disk, by writing data onto it multiple times. CD-RW disks can be rewritten as many as 1000 times. Magnetic Tape: In magnetic tape, data is recorded in frames across the tape, with one frame representing one byte. The frame forms tracks along the length of the tape. Magnetic tape is a serial medium, which means that if you want to find an individual record you have to access it by starting at the beginning of the tape and reading through every record until the required one is found. Magnetic tape is cheap and convenient for backing up data as back ups are rarely used. Also they are considerably cheap compared to the amount of data they are able to hold. An average 7GB can be bought for under �10.00. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Computer Science section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Computer Science essays

  1. Control Unit, Memory Unit, and Arithmetic Logic Unit. The CPU or Central Processing ...

    The more pixels there are, the better the picture will be, this is known as the screen resolution. These notes can be typed using a very low resolution, monochrome screen. If you consider the contents, there is no reason for any further sophistication to be necessary.

  2. Primary or Secondary Storage.

    Another disadvantage is the large capacity offered by this technology per chip. 2. SRAM- this memory is based on transistor technology and does not require refreshing. It consumes more power (thus generates more heat) than the dynamic type, and is significantly faster .It is often used in high speed computers or as cache memory.

  1. Explain the different techniques of gathering information to answer an IT Technical problem or ...

    * How do we gather information from the computer system itself which would help to clarify the problem? (What computer messages are there? E.g. The system does not recognise the hardware).

  2. WAN Devices

    G and B are the most common. * Requires a wireless router to project the signal to a computer or other electronic device. Satellite The internet and WWW. Worldwide - signal sent across many satellites. * Bandwidth of 34 Mbit/s * Ability to send large amounts of information across the world.

  1. Smart Card System

    A system provider receives money in advance from people and stores corresponding value onto their cards. During each of these three kinds of transactions, secured data representing value is exchanged for actual money or for goods and services. Card Types * Memory cards - The chip on this card consists

  2. CP3 - Proposed Solution to a Realistic Problem - Apartment Administration software

    However, it would take a lot longer to code a program in low-level language and experience and skill would be required. All the code is in one procedure and therefore maintainability would be extremely difficult. Low-level languages are also dependent on hardware so if one program works on one type

  1. This technical report will look at various different memory devices and how they are ...

    ROM is "built-in" computer memory which holds data that normally can only be read, not written to. It is used to store some of the operating system commands, and the instruction set of the computer. The data in ROM is not lost when the computer system is switched off, as

  2. Outline the process a PC follows once it has been switched on?

    The first device BIOS to be located is the video card, which has its very own built in BIOS, this in now executed to initialise the video card. Other BIOS's are now located and executed. The BIOS now displays the following: * The BIOS Manufacturer and version number.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work