An option that I’ve seen is just making a small partition on your Mac (about 20-32 GB) and install Leopard, which if you use disk utility it doesn’t need to format the whole drive. Then when ever you need to use the adaptor you just switch to it, dump the files to your Snow Leopard Partition or External drive and switch back.
I haven’t tried this for my self but heard it works great. And make sure you back up before attempting it.
Cheers.