Hi

Something is using the mmc card, for some background reading have a look here to help understand, http://www.umiacs.umd.edu/~jusub/uni...s/19270039.htm

Using a Linux PC I sometimes get this error and it would mean I have a file manager accessing the card, or in a xterm the directory I am in, is the mounted filesystem I want to umount. Simply changing to another directory would mean I can umount.

In the xterm you could type and then try umount.

Or if this doesn't work, have a go at posting the same problem to the Maemo mailing list,
https://maemo.org/mailman/listinfo/maemo-users

Cheers
Rich