The UX21 from Asus, the first "Ultrabook" is a clone of the MacBook Air in terms of appearance, but at some hardware solutions. Indeed, the SSD of the machine is close enough to the format used by Apple Asus chose to use a "bar" instead of a standard such as the MSAT. Currently, there are SSDs in traditional formats, legacy hard drives, but the market tends to gradually adapt the format to the technology.
If the 2.5 inch and 1.8 inches are practical, they were designed for hard drives and are not really suited to hard drives. One solution - standard - is the MSAT, which combines a physical format known (the card Mini Card) with a SATA interface but there are others. Apple - and now Asus - uses SSD "Bar": the connector is similar to that of MSAT but the PCB is much longer, thereby integrating more chips without increasing the price.
In MSAT, the proliferation of channels (and chips) requires models in BGA, significantly more expensive. Asus has chosen A-DATA that offers the XM11. This SSD "Bar" uses a controller already known, the famous home SandForce SF2281, and it interfaces with SATA 6 Gbit / s, a guarantee of performance.
The company does not give practical performance, but it should run around 450 Mb / s data compressible and around 200 MB / s with incompressible data. Apple is interfaced with an SSD SATA 3 Gbit / s is used, with - according to arrivals - a controller or a controller Toshiba Samsung. Hopefully the MSAT, more standard, is used in the next generation of ultraportables, both from Asus (which is likely) that Apple (which is less). 
If the 2.5 inch and 1.8 inches are practical, they were designed for hard drives and are not really suited to hard drives. One solution - standard - is the MSAT, which combines a physical format known (the card Mini Card) with a SATA interface but there are others. Apple - and now Asus - uses SSD "Bar": the connector is similar to that of MSAT but the PCB is much longer, thereby integrating more chips without increasing the price.
In MSAT, the proliferation of channels (and chips) requires models in BGA, significantly more expensive. Asus has chosen A-DATA that offers the XM11. This SSD "Bar" uses a controller already known, the famous home SandForce SF2281, and it interfaces with SATA 6 Gbit / s, a guarantee of performance.
The company does not give practical performance, but it should run around 450 Mb / s data compressible and around 200 MB / s with incompressible data. Apple is interfaced with an SSD SATA 3 Gbit / s is used, with - according to arrivals - a controller or a controller Toshiba Samsung. Hopefully the MSAT, more standard, is used in the next generation of ultraportables, both from Asus (which is likely) that Apple (which is less).
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