Ronald Leroux spotted the following statement from Imation on Apple's Discussion Boards regarding compatibility of their SuperDisk drive with Mac OS X:
The drive will work in OS X only if your drive's model is SD-USB-U2, SD-USB-U3, SD-USB-M2, or SD-USB-M3. If you have one of these models installed you do not need to install any drivers for the drive because OS X has native support. If you did an upgrade to OS X you have to make sure you remove the drivers before the drive will work. If the model of your drive is SD-USB-M, the drive will not work in OS X. Currently we are looking to the solution for this problem.