Guaranteed? I'm running Mandrake 9.1 and my USB card reader is working. You can take that for whatever it is worth.
I have a Sandisk ImageMate SDDR 91
The installation and recongition was easy. I am still working on permissions, but that is because I am stupid, not because of any hardware problems.
And, to qoute Genesee from a different
thread :
I found linuxcompatible to be helpful.