Formatting SD card for Mac & PC?

Is there a way to format the 16GB SD card in my Tascam DR-1 digital recorder so it will mount on both my Mac (Lion) and PC (Windows 7) and -- and here's the key -- still be recognized by the DR-1 as a valid card?

When I format it FAT32 using my PC the DR-1 forces a format on boot.

MisterMe said:

What makes you believe that you can get away with reformatting the card in a file system other than the one used by Tascam?

Click to expand...

Ha. Good point. I guess my concern is more that it USED to mount on my Mac and it no longer does (in Lion). I plug it in and see it mount on the desktop for a second and then it disappears. Then I get a fleeting 'this disc was ejected improperly' error message, which also quickly disappears before I can read it. In Disk Utility, the drive does not show up. It mounts fine on my PC.