According to the log file, os-prober never scans the mounted partitions at all. One possibulity would be due to symlinks. os-prober looks in /dev/discs for partitoons, and then for each partitoon, if it is listed in /proc/mounts, scans it as a mounted partiton. If devfs offers another path to the partition, or if somehow what is in /proc/mounts does not match the /dev/disks entry, then it would not run the mounted tests. This may explain why I did not reproduce this bug when mounting a partition by hand; if I used the right devfs path. -- see shy jo
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