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What file system does the Rio Carbon use? When attached as MSC device it shows up as FAT32. When the microdrive is pulled out and attached to a CF reader it does not show up as a volume under XP. Does the Carbon emulate FAT32 for the host computer?

The Carbon has a genuine FAT32 filesystem, but a non-standard partition table. When reading the bare microdrive, you see the non-standard partition table; when Carbon itself is attached as MSC, the software presents only a certain portion of the actual drive to Windows. So there is also a standard partition table, but it's not at the beginning of the microdrive where Windows looks for it.

Peter