With Windows Vista, your system is ready when you are.

Windows Vista introduces a new power state called Sleep. The new Sleep state in Windows Vista combines the speed of Standby with the data protection features and low power consumption of Hibernate. Resuming use when your PC is in the Sleep state takes just 2-3 seconds. You can shut down and restart your computer less often by using the new Sleep state, a simple one-click on and off experience which not only reduces power consumption, but also helps protect your data.

Sleep works in a different way on Windows Vista-based desktops than it does on Windows Vista-based laptops. When you turn off a Windows Vista-based desktop, all the documents, applications, and data that are currently in use are saved in two places. First, they
are saved to the memory, or RAM, where they are quickly accessible (in Windows XP this was called Standby). Simultaneously, the information is saved to the computer's hard disk (in Windows XP this was called Hibernate). In Sleep, Windows Vista simultaneously
saves the current user information to both memory and the hard disk.

In Sleep, Windows Vista uses the data saved to memory to help you restart faster after extended periods of non-use. Simply move
the mouse or press any key on the keyboard and the computer starts up within seconds.

The Sleep state uses the data saved to your hard disk to protect it in case of power loss. When you resume the use of your desktop
after a power failure, Windows Vista will quickly restart from Sleep using the data saved to disk, with all of your data and applications intact.

On laptop PCs, you can enter the Sleep state by pressing the Power button or closing the laptop lid. Your data is saved to memory,
letting you restart faster. As battery power winds down, Windows Vista quickly transitions the data to disk to help keep the data safe. Windows Vista lets you resume use of your computer more quickly and reliably than previous versions of Windows.

Windows SuperFetch, a new technology in Windows Vista, allows applications and files to load much faster than on Windows XP-based computers. In previous versions of Windows, system responsiveness could be uneven. You may have experienced sluggish behavior
after booting your machine, after performing a fast user switch, or even after lunch. Although too many carbohydrates might slow
you down after lunch, your computer slows down for different reasons. When you're not actively using your computer, background tasks—including automatic backup and antivirus software scans—take this opportunity to run when they will least disturb you. These background tasks can take space in system memory that your applications were using. After you start to use your PC again, it can
take some time to reload your data into memory, slowing down performance.

SuperFetch understands which applications you use most, and preloads these applications into memory, so your system is more responsive. SuperFetch uses an intelligent prioritization scheme that understands which applications you use most often, and can even differentiate which applications you are likely to use at different times (for example, on the weekend versus during the week), so that
your computer is ready to do what you want it to do. Windows Vista can also prioritize your applications over background tasks, so that when you return to your machine after leaving it idle, it's still responsive.

Adding system memory (RAM) is often the best way to improve your PC's performance. More memory means applications can run
without needing to access the hard drive. However, upgrading memory is not always easy. You need to know what type of memory you need, purchase the memory, and open your computer to install the memory—which sometimes can invalidate your support agreement. Also, some machines have limited memory expansion capabilities, preventing you from adding RAM even if you are willing to do so.

Windows Vista introduces a new concept in adding memory to a system. Windows ReadyBoost lets users use a removable flash memory device, such as a USB thumb drive, to improve system performance without opening the box. Windows ReadyBoost can improve system performance because it can retrieve data kept on the flash memory more quickly than it can retrieve data kept on the hard disk, decreasing the time you need to wait for your PC to respond. Combined with SuperFetch technology, this can help drive impressive improvements in system responsiveness.

Windows ReadyBoost technology is reliable and provides protection of the data stored on your device. You can remove the memory
device at any time without any loss of data or negative impact to the system; however, if you remove the device, your performance returns to the level you experienced without the device. Additionally, data on the removable memory device is encrypted to help
prevent inappropriate access to data when the device is removed.

Windows ReadyDrive enables Windows Vista PCs equipped with a hybrid hard disk to boot up faster, resume from hibernate in less
time, preserve battery power, and improve hard disk reliability. Hybrid hard disks are a new type of hard disk, with integrated non-
volatile flash memory.

The hybrid disk is intended for mobile PCs running Windows Vista. Your data is written to the flash memory, which saves work for the mechanical hard disk—saving the battery power. The hybrid disk helps Windows Vista resume faster from Sleep because data can be restored from flash memory faster than from the mechanical hard disk. And since more data is written to the integrated flash memory than to the traditional hard disk, you have less risk of hardware problems with the hard disk when you're on the move. Windows Vista takes advantage of hybrid hard disk to save battery life, resume use faster from hibernation, and improve reliability.