I'm considering buying an ExpressCard 34 USB 3 adapter for my 2010 MacBook Pro 17" so that I can benefit from USB 3.0 speeds when used with my Samsung S2 1 TB USB 3.0 superspeed drive.
However, such Mac OS X compatible ExpressCard 34 USB 3.0 cards are scarce:
Lacie make a ExpressCard 34 USB 3.0 but the Mac OS X driver they supply only supports their own USB 3.0 drives, not other brands of drives. Not really true USB 3.0 compatibility, rather proprietary. Sure, it uses the USB 3.0 physical interface, and runs at USB 3.0 speeds perhaps, but it is proprietary. USB 3.0 is a standard, a universal standard, hence the name. Lacie do point out that it's only for their drives on their literature online, but you have to look carefully, it's not a headline point.
CalDigit also make a ExpressCard 34 USB 3.0 which looks a little more promising than the Lacie because although "optimised" for their drive, they don't say it won't work for other drives, but nor do they say it will work at USB 3.0 speeds for other drives. http://www.caldigit.com/avdrive/Card_laptop.html
Are there any other brands of ExpressCard 34 USB 3.0 cards, but which can work with any brand of USB 3.0 hard drive in Mac OS X at (or at least a few Gbit/s) USB 3.0 speeds? Have you tried them? Or is there real benchmark data?
Have you tried the CalDigit card and does it run at (or at least a few Gbit/s) USB 3.0 speeds in Mac OS X with non-CalDigit brand drives?
Do these cards and drives also work at USB 3.0 speeds (or at least a few Gbit/s) when booted via Boot Camp into Windows?
Updated question to say "near to" USB 3.0 speeds as I'm informed ExpressCard does not support 5 Gb/s but 2.5 Gb/s. 2.5 Gb/s is far better than 480 Mbit/s of USB 2.0.