The MacBook Air family is a line of ultraportable Macintosh notebook computers created by Apple Inc.. The first-generation MacBook Air was a 13.3"-only model, previously promoted as the World's Thinnest Notebook, introduced at the Macworld Conference & Expo on January 15, 2008. It featured a custom Intel Merom CPU and Intel GMA graphics. In late 2008, the CPU was updated to a faster, non-custom Penryn CPU and integrated Nvidia GeForce graphics while the hard drive capacity was increased and the micro-DVI video port was replaced by the Mini DisplayPort. A mid-2009 refresh, introduced alongside the MacBook Pro family, featured a slightly higher-capacity battery, and a faster Penryn CPU. On October 20, 2010, Apple released a redesigned 13.3" model, with improved enclosure, screen resolution, battery, and flash storage instead of a hard drive. In addition, a new 11.6" model was introduced, offering reduced cost, weight, battery life, and performance relative to the 13.3" model, but better performance than typical netbooks of the time. On July 20, 2011, Apple released an updated model in the same form factor as the prior model. The new model was powered by new Sandy Bridge dual-core Intel Core i5 and i7 processors, had a backlit keyboard, Thunderbolt instead of Mini DisplayPort and Bluetooth was upgraded to v4.0. Maximum flash storage and memory options were almost identical. The MacBook Air is designed for thinness; it is also lighter than most competing models. The computer features a glossy LED backlit display and a full-size keyboard, as well as a large trackpad that responds to iPad-related Multi-Touch gestures such as pinching, swiping, and rotating. With the release of Mac OS X Snow Leopard, the Air's multi-touch trackpad also supports handwriting recognition of Chinese characters. On the 11-inch MacBook Air, the left side of the computer has a MagSafe power connector, a USB port, a headphone jack, and a microphone. The right side of the computer has a USB port and a Mini DisplayPort, now replaced by a Thunderbolt port in the 2011 version. On top of the screen bezel there is an iSight, which is now dubbed the FaceTime camera. The MacBook Air was the first subcompact laptop offered by Apple since the full-featured 12" PowerBook G4 was discontinued in 2006. It was also Apple's first computer with an optional solid-state storage drive. ArsTechnica found "moderate" performance improvements of the 64 GB solid-state drive of the first generation Air over the standard 80 GB hard drive in tests. On October 14, 2008, new models were announced with improved capacities of 128 GB (solid-state) and 120 GB (hard drive). For the late 2010 MacBook Air, only flash storage is available, in 64 or 128 GB capacities on the 11" model, and 128 or 256 GB on the 13". The CPU in the first-generation MacBook Air was a custom engineered Intel Core 2 Duo Merom that was 40 percent of the size of the standard chip package. For models of late-2008,The CPU was replaced with a low-voltage Core 2 Duo Penryn chip with 6 MB of cache, running on a 1066 MHz bus. The MacBook Air has no user-replaceable parts. The flash memory and battery are enclosed within the casing, with RAM soldered onto the logic board. The flash memory, engineered to be difficult to access, has a 128MB cache and a mSATA connection to the logic board. The battery can be replaced using normal screwdrivers, though it is unclear whether this process would void the computer's warranty. As part of the out-of-warranty service, Apple offers to replace the battery for a fee.