Ok, first off in general you can start a new thread where you describe your entire problem, so people know what you're asking about.
Second, San Disk is a company, not a media card format. But from your description, I'm guessing you'er talking about the miniSD cards that go into some cell phones. My boyfriend has one of those, and he also has an adapter that is shaped like a normal SD card and the mini card goes inside it, so then it works in any normal SD card slot or card reader.
If you already have a card reader that should work, you can stick with that. I'm suspicious of any card reader that needs a driver installed on a mac, because every one I've ever seen just works, but if it really does need a driver the best thing to do is contact San Disk, explain about the minidisk issue, and ask them for a download. Or, you can find someone with a computer that has a CD tray and try to copy the contents of the minidisk onto a normal disk or a USB stick or something like that. I don't know if that will work-- some companies protect their software from copying like that, and some don't. In my experience it does work with some software (especially free software) but not with the kind that has copy protections like asking for a serial number when you install it.