I just stumbled on this product from the Taiwanese company ACARD, the ARS-2212. Apparently available widely in the US and in Europe, this product is now also available in Japan.

Our ARS-2212 is a slim 2.5” HDD enclosure which stores two HDDs (side by side). It backups your computer hassle free ensuring you always have ALL your data, and stores it in a compact size (163×16x163mm).

ARS-2212 Mirror Smart Mini is the Digital Treasure Stor. which could protect important data by data redundancy.It adopts 2.5″ SATA hard disk drive that is the first slim style Mirror device in the world. User will find it is user-friendly and easy to use through the USB interface. It could plug and play immediately loads ARS-2212 Mirror Smart Mini in the computer without rebooting. It is suitable for general consumer such as personal, student or office worker who is at home or in office or on the run. In particular, ARS-2212 is the best storage solution for Notebook users, so we call it “Notebook Mate”.

The user can store important data into this external RAID1-protected storage.Once a single hard disk drive is crushed, the redundant feature of Mirror will keep the full set of data intact in the other disk. ARS-2212 Mirror Smart Mini support major 2.5” SATA HDD’s in the market. Because of the high compatibility and reliability, ARS-2212 is highly reliable in data backup and greatly smooth in operation. ARS-2212 Mirror Smart Mini is designed so simple and brightness. It could match any style of Notebook in the market. ARS-2212 Mirror Smart Mini with the shape of simplicity design, let you not only become public focus, but also be the storage master with charming style.