Backing+Storage+and+Memory


 * ===Hard Disk ===

(Magnetic storage)
|| Hard disks are measured in Gigabytes. A typical hard disk size will be around 120 Gb - 1 Terabyte. || The hard disk is the main storage device in your computer. It is a bit like a filing cabinet: all of your data files and applications software are stored on it. || Relatively cheap – now in video cameras || Contains moving parts Data can be lost when your computer hard disk crashes – always shut down properly! Could break down ||
 * ===Solid State hard Drive ===

(Silicon Storage)
|| Up to 160GB || The future of hard drives Basically the same as a Flash memory stick – in place of your normal magnetic hard drive || Reduced risk of damaging due to no moving parts. Better battery life due to no moving parts || Expensive compared to Magnetic (traditional hard drive) <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Wears out eventually ||
 * ===<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Floppy Disk ===

<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">(Magnetic Storage)
|| <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Only 1.44mb <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">(300 pages of text) || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">A floppy disk is a disk storage medium composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic carrier lined with fabric that removes dust particles. || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">1) They allow to copy files from one computer to another <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">2) They are quite cheap || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">1) They have a limited capacity <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">2) They are relatively slow <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">3) They are less reliable than hard disks so proper care should be taken to prevent loss of data ||
 * ===<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Zip Drive ===

<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">(Magnetic)
|| <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">100mb || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Zip drive is a medium capacity removable disk storage system that was introduced by lomega in late 1994. || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">1) Higher storage capacity than floppy disks || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">2) Zip disks are relatively cheaper than the floppy disk ||
 * ===<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Magnetic tape backup === || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">100gb || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">A device that could store large amount of data. Made of a thin magnetize coating on a long. Narrow strip of plastic || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">It is very cheap to buy and has a large amount of space to save || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Need a special equipment to save and read ||
 * ===<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">CD-ROM ===

<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">(optical storage)
|| <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">700mb || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">A optical device that are read by laster it stores and read data by laser || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">It can be only written once || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Very easy to snap and break ||
 * ===<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">CD-RW ===

<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">(optical storage)
|| <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">700mb || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">A optical device that are read by laser it stores and read data by laser || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Can be written over and over again. Can be edited. || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">More expensive compare to CD-ROM ||
 * ===<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">DVD ===

<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">(optical storage)
|| <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">4.7BGB || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">A optical device that are read by laster. It stores and read data by laser || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Larger storage capacity than CDs || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">They do not work in CD drives, so you need to buy a new DVD device ||
 * ===<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Flash Memory Stick ===

<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">(Silicon storage)
|| <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Up to 64GB || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Memory stick is a removable flash memory card format, launched by Sony in October 1998, and is also used in general to describe the whole family of Memory sticks. || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Easily allows one to transport documents from one computer to another, small and is easy to carry around with you. || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">If one wants a memory stick that hold a very big amount of data such as if you are thinking to use it for a lot of large document, then they can be quite expensive to buy. ||
 * ===<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Memory Cards ===

<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">(silicon Storage)
|| <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Up to 32 GB || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">A memory card or flash card is an electronic flash memory data storage device used for storing digital information. || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">Image transfer is faster from camera to computer using a memory card reader. || <span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">They are relatively more expensive than the flash memory sticks. ||

__**Data**__

Photo 3MB Song 5MB Film 700MB

Data is in formation that has no meaning. If someone walks up to you and gives you a piece of paper with '120987 written on it, the number could mean absolutely anything. It could be their birthday, or how much money you owe them. Data only becomes in format ion when you know the context of the data.

1) Computers are machines that process data. They're stupid - they don't understand the data they process.

2) If you get a computer to process data that's incorrect, the results will be meaningless. E.g. If you program a computer to work out the total cost of buying fifty pizzas at £2.99 each, but you type in £29.9 by mistake, you'll get the wrong answer. This is called Garbage In, Garbage Out (GIGO).

3) Some people call this 'computer error'. They're wrong - it's human error. Computers hardly ever make mistakes. They just do what they're programmed to do.

4) Computers use a binary code (i.e. they use only 2 digits) to represent data. Usually a circuit that's switched on represents the digit 1, and one that's switched off represents the digit 0.