/mnt/flash: device is busy
Any idea why I might be getting this error?
Did you leave a shell open where the current directory is under /mnt/flash?
99% of the time I see a message like that it's because I have a shell still cd'd into the directory in question. Make sure you don't have the directory open (either in a shell or in a browser like nautilus) and try again.
"lsof /mnt/flash" may also help to identify the process responsible.