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 drive. ArsTechnica found "moderate" performance improvements of the 64 GB[note 1] 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 SSD and 120 GB hard drive.
Don't rely on it being preserved. Many repairs require Apple to replace or reformat the hard disk, which will result in the loss of your data. Please make sure you back up your data on a regular basis to minimize your data loss. Apple and its AASPs are not responsible for any damage to or loss of any applications, data, or other information stored on your MacBook Air while performing service.
Nov 11 Screen sleep -> WoW dies I've noticed that when I go AFK long enough that the screen is put to sleep, upon waking up, WoW is unresponsive. It's not even possible to alt-tab out or force quit it. I have to try to keyboard restart the Mac and wait for WoW to fail to force quit. This never happened with true fullscreen, because that mode prevented the screen from sleeping.Azreluna4 Nov 11
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MacBook Air components are officially non-user-replaceable, though third-parties do sell upgrade kits for the SSDs. The flash memory and battery are enclosed within the casing, with RAM soldered onto the motherboard. The flash memory, difficult to access, has a 128 MB cache and a mSATA connection (updated to a proprietary PCIe interface) to the motherboard.