FOR DISPOSAL OF COMPUTERS
Sleep and Hibernation Modes
For most of the day computer systems usually aren't used and don't do anything, lying idle. Therefore, sleep and hibernation modes have been created so that when the computer system hasn't been used for a while it will effectively shut down the computer system.
Real, physical servers are so powerful they will complete one action in nanoseconds and won't do anything until data is requested again. Therefore they spend most of their time doing nothing, this is very inefficient and it wastes energy and money. To solve this companies are now using 'Virtual Servers'. These are servers that are 'images' of a complete server and they run as a software program on the physical server. Many virtual servers can run on one physical machine, so the loading is much higher. Many data centres now operate with virtual servers.