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A laptop computer that weighs less than four pounds. In order to reduce weight, subnotebooks, also called "Ultrabooks" or "ultralights," often eliminate built-in CD/DVD drives. However, if optical discs are required when traveling, an external drive in the travel bag generally adds more weight than a built-in drive.

The Mini Laptop/Netbook
In the 2007 time frame, subnotebooks called "mini laptops" and "netbooks" made their debut, the latter term coined by Intel for machines that use its Atom processor. Weighing up to three pounds, mini laptops/netbooks have screens from 8 to 10" (see netbook). For features of portable computers, see laptop. See ultrathin laptop, notebook and Ultrabook.

The Trend Setter
In 1998, Sony popularized the subnotebook class with its VAIO (pronounced "vy-o") 505G at three pounds and less than an inch thick. To reduce traveling weight, floppy and CD-ROM drives were external, and a docking station was included. (Image courtesy of Sony Corporation.)

Laptop and Netbook
The Acer netbook on the right sports an 8.9" screen compared to 15" on its big brother to the left. Netbooks sacrifice keyboard and screen size for portability.
References in periodicals archive ?
Later, the portal will also be accessible from palmtop computers, television sets and mobile phones.
Eventually," declared cofounder and president Keith Blei, "a Power Dot sensor could be incorporated into palmtop computers, PDAs, internet appliances, and Web-enabled cell-phones, eliminating the need for a separate tranceiver and lowering the cost of the Power Dot itself.
PROBLEM SOLVER: Etails offers a portable project management system for palmtop computers.
Services will include news and information alerts, online shopping, banking and brokerage services and they will be available to all of Rogers' wireless subscribers across Canada over wireless devices, such as digital PCS phones, two-way pagers and wirelessly-enabled palmtop computers.
Vodafone AirTouch Plc and Casio Computer Co Ltd have signed a worldwide agreement to work together to develop mobile multimedia palmtop computers that incorporate wireless Internet content.
Applications addressing palmtop computers with audiocommunications capabilities, telephones with an RJ-45 connector and cellular IP phones can also be created.
Accessing the Internet from palmtop computers via the mobile is already possible in the United States.
This item includes notebook and palmtop computers, such as the Palm Pilot.
With that in mind, Psion's new palmtop computers feature a multitasking platform that will allow the handheld products to communicate with products such as fax machines, printers, PCs, digital cellular phones and other palmtops