We currently have no solution for Mac OS X, although we would be happy to find a solution for PCIe based Mac desktops quickly. Because of the superior quality of Final Cut Pro and Mac OS X, we have had many video professionals wanting to use Sony/Sandisk's SxS ExpressCards with our PCIe to ExpressCard Drive.
With The Windows Xp, many end users have reported that after inserting a PCIe based ExpressCard into a PCIe to ExpressCard drive they can evoke the 'scan for new hardware' command in the 'device manager' resulting in the ExpressCard being recognized. These finding have been confirmed by Synchrotech (with the test system mentioned above). However, we also have reports of this not working with all systems.