 Asus released the Eee PC subnotebook on October 16, 2007, with 2, 4 or 8 gigabytes of flash memory.On January 31, 2008, Apple released the MacBook Air, a thin laptop with an optional 64 GB SSD.The Apple Store cost was $999 more for this option, as compared with that of an 80 GB 4200 RPM hard disk drive.