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 SuperDrive remained unchanged in this respect, although each new PowerBook boasted a longer battery life. (*)