Solid-state drives are so speedy these days that that even a SATA interface might not have the bandwidth to cope. It's a good thing that Samsung has started mass-producing the first PCI Express-based SSDs for Ultrabooks, then. The new XP941 series uses PCIe's wider data path to read at nearly 1.4GB/s -- that's 2.5 times faster than the quickest SATA SSDs, and nimble enough to move 500GB in six minutes. It also ships in a tinier M.2 format that makes past card-based SSDs look gargantuan, even when there's up to 512GB of storage. Samsung hasn't named laptop makers receiving the XP941, although it doesn't take strong deductive skills to spot one of the (probable) first customers. When Apple is shipping a new 13-inch MacBook Air that just happens to use a very similar PCIe SSD from Samsung, there's likely more than coincidence at work.