According to a review released today:
''Macworld'''s Ramon Loyola:
[quote]''The $799 model comes with a 128GB drive, but if that isn’t enough, Apple offers upgrades all the way up to 2TB if you’re willing to pay. The SSDs are PCI-e cards and Apple doesn’t consider them user-upgradeable. So, if you prefer to house your storage inside the computer instead of attaching an external drive, you might consider shelling out more money for an upgrade.''[/quote]