Question from a new user. I plug in my memory stick and it recognise it with no problem. I view folder to make sure the contents is corrent. I right click device and select umount. System tells me that umount: /mnt/sda device is busy. Please check the disk is entered correctly. I unplug memory stick and try umount again but same error message persist. It can still see the folders. I then plug in another memory stick but the system still sees the initial device.