20-10-2012, 12:38 PM
LAPTOP
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DEFINATION:
A laptop, also called a notebook is a personal computer for mobile use. A laptop integrates most of the typical components of a desktop computer, including a display, a keyboard, a pointing device (a touchpad, also known as a track pad, and/or a pointing stick) and speakers into a single unit. A laptop is powered by mains electricity via an AC adapter, and can be used away from an outlet using a rechargeable battery.
Sub notebook
A subnotebook or ultraportable, is a laptop designed and marketed with an emphasis on portability (small size, low weight and often longer battery life) that retains performance close to that of a standard notebook. Subnotebooks are usually smaller and lighter than standard laptops, weighing between 0.8 and 2 kg (2 to 5 pounds); the battery life can exceed 10 hours when a large battery or an additional battery pack is installed.
Net book
With primary focus given to web browsing and e-mailing, net books are intended to "rely heavily on the Internet for remote access to web-based applications
Rugged laptop
A rugged (or ruggedized) laptop is designed to reliably operate in harsh usage conditions such as strong vibrations, extreme temperatures, and wet or dusty environments. Rugged laptops are usually designed from scratch, rather than adapted from regular consumer laptop models
Tablet laptop
Tablet laptops have the advantage to offer the keyboard and pointing device (usually a track pad) of older notebooks, for users who do not use the touch screen display as the primary method of input.
Advantages
Portability is usually the first feature mentioned in any comparison of laptops versus desktop PCs.
Productivity: Using a laptop in places where a desktop PC can not be used, and at times that would otherwise be wasted.
Size: Laptops are smaller than desktop PCs. This is beneficial when space is at a premium, for example in small apartments and student dorms. When not in use, a laptop can be closed and put away.
Battery: a charged laptop can continue to be used in case of a power outage and is not affected by short power interruptions and blackouts. A desktop PC needs a UPS to handle short interruptions, blackouts and spikes; achieving on-battery time of more than 20–30 minutes for a desktop PC requires a large and expensive UPS
All-in-One: designed to be portable, laptops have everything integrated in to the chassis. For desktops (excluding all-in-ones) this is divided into the desktop, keyboard, mouse, display, and optional peripherals such as speakers.
Durability
Equipment wear : Due to their portability, laptops are subject to more wear and physical damage than desktopsA liquid spill onto the keyboard, a rather minor mishap with a desktop system, can damage the internals of a laptop and result in a costly repair. One study found that a laptop is three times more likely to break during the first year of use than a desktop.
Parts replacement : Original external components are expensive, and usually proprietary and non-interchangeableOther inexpensive but fragile parts often cannot be purchased separate from larger more expensive components. The repair costs of a failed motherboard or LCD panel often exceed the value of a used laptop.
Heat cooling : Laptops rely on extremely compact cooling systems involving a fan and heat sink that can fail due to eventual clogging by accumulated airborne dust and debris. Most laptops do not have any sort of removable dust collection filter over the air intake for these cooling systems, resulting in a system that gradually runs hotter and louder as the years pass.
Battery life : is limited because the capacity drops with time, necessitating an eventual replacement after a few years. A laptop battery in new condition typically stores enough energy to run the laptop for three to five hours, depending on the computer usage, configuration and power management settings. The battery is often easily replaceable, and one may replace it on purpose with a higher capacity model to achieve better battery life.