the 17-inch PowerBook used the same screen as that used on the 17-inch flat-panel iMac, but with a thinner backlight. Later in 2003, the 15-inch PowerBooks were redesigned and featured the same aluminum body style as their smaller and larger siblings, and with the same feature set as the 17-inch model (including the backlit keyboard). This basic design would carry through the transition to the Intel-based MacBook Pro, lasting until late 2008. In April 2004, the aluminum PowerBooks were upgraded. The SuperDrive was upgraded to 4× burning speed for DVDs, the fastest processor available was upgraded to 1.5 GHz, and the graphics cards were replaced with newer models, offering up to 128 MB of video memory. A third built-in speaker was added to the 12-inch model for improved midrange sound. In addition, AirPort Extreme cards became standard for all PowerBooks instead of being offered as an add-on option. In January 2005, the specifications of the aluminum PowerBooks were revised once more to accompany a price decrease. Processor speeds were increased to a maximum of 1.67 GHz on the higher specification 15-inch and all 17-inch versions, while the lower specification 15-inch model and the 12-inch unit saw an increase in speed to 1.5 GHz. Optical audio output was added to the 17-inch version. Memory and hard drive defaults were increased to 512 MB and 5400 rpm, respectively, with a new storage maximum of 100 GB on the 17-inch model. Each model also received an enhanced trackpad with scrolling capabilities, a revised Bluetooth module supporting BT 2.0+EDR, and a new feature that parks the drive heads when sudden motion is detected by an internal sensor. Support for the 30-inch Apple Cinema display was also introduced in the new 17-inch model and was optional in the 15-inch model via a build-to-order upgrade to the computer's video hardware. The SuperDrive now included DVD+R capability. In October 2005, the two higher-end PowerBooks were upgraded once again, with higher-resolution displays (1440 × 960 pixels on the 15-inch model, and 1680 × 1050 pixels on the 17-inch model) and faster 533 MHz DDR2 (PC2-4200) memory. The SuperDrive became standard equipment and included support for dual-layer DVDs on the 15- and 17-inch models. The 17-inch model was updated with a 120 GB standard hard drive, as well as a 7200 rpm, 100 GB build-to-order option. These drives were also options on the 15-inch PowerBook. The 12-inch model with