View Single Post
Posts: 1,048 | Thanked: 1,127 times | Joined on Jan 2010 @ Amsterdam
#2
Often when something like that happens, it's because there is I/O activity on the partition you are trying to unmount. Make sure nothing is running and check with listing the open files.

Code:
sudo lsof | grep <write_partition_here>
If anything is open, kill it and try again.
Good luck!
 

The Following User Says Thank You to anthonie For This Useful Post: