Excerpt: After wading through pages of instructions on formatting for use with my MacBook Air, I was unable to format the drive. I finally went to Apple Support, found concise instructions and succeeded in formatting the drive.
Excerpt: For a RAID device that operates via Thunderbolt interface, I expected this little device to transfer data faster than a standard, single 7200 RPM hard drive connected over USB 3.0. But, it's really no faster, even at RAID 0. About 159MB/sec read and write.
Excerpt: this passport drive does not come up as an icon when it is loaded.it doesn't let you know when it is in the process of backing up the computer information and does not let you know when it is done.
Okay for now - keeping my fingers crossed that it won't die on me.
K. Kekuewa, Amazon
30 July 2014
Summary: Early review, as I've only been using this for about a month. Nice speed with TB. It wasn't clear in any of the descriptions or other reviews, but you'll need to use the operating system for RAID 0 or RAID 1.