backingstorage

Backing storage:

Basic knowledge:

1KB (kilobyte) = 1024 Bytes 1MB (megabyte) = 1024 KB 1GB (gigabyte) = 1024 MB 1TB (terabyte) = 1024 GB

Data is stored in a hard disk, which is disk/s of magnetic plates that can be read and written. The amount of data which can be stored is calculated as below: Number of readable sides * Number of cylinders * Sectors per track * Bytes per sector

CDs These are discs that can hold around 700MB of information. They are made of plastic, about 1.2mm thick. They are very inexpensive but very easy to break/scratch which can harm the data that it holds. Most CDs can read and write, but very old ones might not be able to. There is a laser beam reader to read these CDs inside your computer or your CD, DVD read (or maybe write as well) that can read (maybe write) the information on the disc.

DVDs Most DVDs are single layered and can hold around 4.7GB of information. But if two sided it can hold around 18GB of information.

R - read only data, only can record once RW - read and write, rewritten about 1000 times RAM - can be rewritten over 100000 times HD - more space for an high-definition video and movies Blu-ray - Can store up to 50GB of information, natural HD movies/videos would be able to be placed on them.

Backup -Back up files every so often so you don't lose all at once if computer crashes -Back up especially if there is important work so you wouldn't lose all your work -Keep back-up up to date

RAM random-access memory, thee allow you to store temporarily information, if you switch off your computer the information would be lost

ROM read-only memory, information that would not be lost even after computer shutdown, usually start up data.

Software licensing
 * Creative Commons
 * A software you distribute to others to let them try it out.
 * Like a demo again
 * has to follow a rule if the creator sets one.
 * Shareware
 * licensed software that is initially distributed freely in the manner of public domain software.
 * Like a demo in a game
 * Limited time and limited functions
 * If want to carry on using the product users must pay license fee.
 * Improved version of this software when user is paying to use it.
 * Licensed software
 * sold, purchasers have the right to use the software after buying the software.
 * The right to use the software on one or more standalone computers
 * The right to distribute the software over a network for use on a specific number of network stations
 * A site license, giving the right to distribute and use the software on any computer on a particular site.
 * Open source software
 * a software that the source code is available for anyone to modify and reuse.
 * Generally free software and distribution is allowed.
 * Public domain software
 * Free software
 * available to everyone or specific group of users at 0 purchase cost.
 * Can place restrictions if they want, but generally they don't


 * ** General Purpose Software **  ||   ** Description **   ||   ** Example(s) **   ||
 * Database || Used to store and retrieve information || MS Access, FileMaker ||
 * Spreadsheet || Excel, where you place data in and it will process a function. || Excel ||
 * Word Processing || Somewhere for you to write on your computer || Microsoft Word ||
 * Desktop Publishing (DTP) || To help you edit images and words || Pages ||
 * Graphics Packages || Help you draw on the computer. || Photoshop ||
 * Computer-aided design (CAD) || Help you to create an object inside a computer you can delete, add without erasing or remaking || Google Sketchup ||
 * Communications || Allow you to connect to other people’s computer/share your work || Email, Browser ||
 * Presentation Graphics || Help you to present your idea. || Keynote ||
 * Web Design Packages || To create a webpage || Dream weaver ||