Sandisk Compact Flash problem

I have an older Canon Digital Elph S250 digital camera that uses compact flash media. The CF card can be read fine through a card reader on my desktop Windows XP computer. But when I try to read the card on my Mac using a CF USB reader, it tells me that the drive cannot be read by a Mac. The file system used appears to be FAT 16, which is an older DOS file system. Any ideas about this? Do more modern cameras with a different kind of flash card use a different file system that can be read on a Mac? I would like to be able to read the cards on either of my computers. I want to load the pictures on the desktop since I have automated backup there, but I sure prefer to use my Mac to look at and manipulate the photos. But I don't want to have to transfer from one computer to the other every time over my wireless network.

It shouldn't be, since I'm using a very high-quality power supply, an Antec TruePower 330.  I also can't imagine a USB card reader to use enough power to cause problems.  It really doesn't use any juice anyway until you put a memory card in it.
Also, if I plug it in after Windows has loaded it will recognize it right away every time.  I think if I plug it in while Windows is booting it will freeze the boot process until I unplug it again.
Here are my system specs:
MSI KT4 Ultra v1.0 (MS 6590) w/ v1.3 BIOS
Athlon XP 1600+
1 stick 512MB PC2700 (DDR333) Micron/Crucial memory
Antec TruePower 330W
Nvidia Geforce4 Ti 4200 128MB AGP 8x
Western Digital 20GB 7200RPM
Lite-On 32x CD-RW
Intel Pro 100 NIC
Soundblaster Live! Value
Microsoft Optical USB mouse
Sandisk CompactFlash card reader

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