The first generation MacBook Pro appeared externally similar to the PowerBook G4, but used the Intel Core processors instead of PowerPC G4 chips. The 15-inch model was released in January 2006, a 17-inch model in April, both of which received several updates and Core 2 Duo processors later in the year.
The second model, known as the "unibody" model, has a more tapered design and a casing made from a single block of aluminum. It debuted in October 2008 as the 15-inch MacBook Pro and the 13-inch aluminum unibody MacBook. The following January brought the design to the 17-inch model, along with the built-in battery that joined the rest of the MacBook Pro line in June, including the 13-inch model which Apple absorbed into the MacBook Pro line. Subsequent updates brought upgraded Intel Core i5 and i7 processors and introduced Intel's Thunderbolt technology.
Apple released the third generation of MacBook Pro in June 2012 as a 15-inch screen size only. At the same time, slightly updated versions of the previous 13- and 15-inch unibody models were announced that will sell in parallel, although Apple has delisted and possibly discontinued the 17-inch variant. While dimensionally smaller than its predecessor, the similarly styled third generation model still retains a unibody form factor. Specification-wise, the most substantial differences in the next-generation MacBook Pro are the fitment of a significantly higher resolution Retina display, the elimination of the optical drive, and replacement of hard disk drives with solid-state drives.
The original 15-inch MacBook Pro was announced on January 10, 2006, by Steve Jobs at the Macworld Conference & Expo. The 17-inch model was unveiled on April 24, 2006. The first design was largely a carryover from the PowerBook G4, but used Intel Core CPUs instead of PowerPC G4 chips. The 15-inch Macbook Pro weighed the same as the 15-inch aluminum PowerBook G4, but was 0.1 inches (0.25 cm) deeper, 0.4 inches (1.0 cm) wider, and 0.1 inches (0.25 cm) thinner. Other changes from the PowerBook include a built-in iSight webcam the inclusion of MagSafe, a magnetic power connector designed to detach easily when pulled to prevent the entire laptop from being pulled off a surface. Both features were later brought over to the MacBook. In order to fit into the slimmer MacBook Pro, the optical drive was half the speed of the one in the PowerBook G4 and could not write to dual layer DVDs.
Both the original 15- and 17-inch model MacBook Pros come with ExpressCard/34 slots, which replace the PC Card slots found in the PowerBook G4. All pre-unibody 15-inch models have two USB 2.0 ports and one FireWire 400 port, while the 17-inch models have three USB 2.0 ports as well as one FireWire 400 port. When first introduced, the MacBook Pro did not come with FireWire 800 or S-Video ports, although FireWire 800 was added in the next 15-inch model revision and was present in every version of the 17-inch design. S-Video capability can be attained through the use of a DVI to S-Video adapter. External displays with up to a 2,560 × 1,600 pixel resolution are supported through a dual-link DVI port. All models include a built-in Gigabit Ethernet port, Bluetooth 2.0, and 802.11a/b/g. Later models include support for the draft 2.0 specification of 802.11n and Bluetooth 2.1.
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