Ensure that the media is not being used.
Remember, media is “being used” if a shell or an application is accessing any of its files or directories. If you are not sure whether you have found all users of a CD (for example, a shell hidden behind a desktop tool might be accessing it), use the fuser command. See How to Determine If Removable Media Is Still in Use.
Eject the media.
# eject media |
For example, for a CD, you would do the following:
# eject cdrom |
For example, for a USB memory stick, you would do the following:
# eject rmdisk0 |
You can view the removable device name with the eject -l command.