I've posted a few times already about apparent issues with 10.2.4 and various types of flash memory cards. My experience with both CF and MMC/SD cards is that their "native" formatting in the cameras is not totally compatible with the latest instantiation of the OS X flash disk drivers. I didn't seem to have this severe a problem in earlier versions of Jaguar. I've run into this with my Canon S10 CF cards and Canon Elura2 MMC and SD cards on both my TiPB and my wife's PMG4. The only fix that I've found to work 85% of the time is to erase and format the flash card in a Windows PC (ouch...sorry), then use the camera to take some photos, then read the flash card on the Mac. Even with this process, the flash card doesn't always mount on the Mac without a reboot. YMMV and all that... Regards, Jim