How come? Have you tried it with Hamster file manager, or just with the default one? mount point should, of course, remain, but the content?

Anyway, it would be interesting to check what *exactly* happens, when magnet is removed. Even if it unmount something, I guess it's only for /dev/mmcblk1p1, as other partitions are, definitely, untouched. Filesystem used may be important, too.

Also, I don't believe that it actually wait 'till content is properly unmounted, if, for example, device can't be unmounted due to operation in progress. I guess that, at most, it just throw umount -f and remove power after pre-defined (very short) time, no matter of results. I wouldn't count on sync before, too.

/Estel