I can't remember where I read it but what I do remember is that SanDisk and Microsoft spent some time and effort to make it such that Macs could not use this device.
Other device makers are doing similar things. My newer Canon camera is usb but does not appear on the desktop when plugged into the usb port. Instead it boots up a Canon program that allows you to download images but also prompts you to print using a Canon printer. I can format the sd card in a generic windows format but the camera does not like it. If I fiddle with it long enough it will work and then appear on the desktop but it makes me mad. It seems that many device makers are going in this direction.
Enough of my rant, check out this link to see if it helps. I use Ipods so I can't vouch for the quality of the program but it's worth a shot.
http://www.ridesforall.com/archit/sansaitunes/index.html