Options when a disk does not unmount "Eject Failed" appears when
attempting to unmount a drive. There can be a variety of causes
for this behavior. A clue about the origin is in the error
message that appears. If the wording is: "The disk could not be
unmounted. Make sure that all applications and files are closed
on this disk." The cause is likely an open program, a file
transfer, or an additional user on the machine using the disk.
If the wording "Resource Busy" is added to the error, close all
open programs, and try again. If the message continues to
appear, reboot the computer. There is usually a crashed program
that can not be closed, or a cabling/power supply problem.
Determining the origin can be done by using the Terminal program
(located in Applications --> Utilities.) Type the command: Where
the command says "drive", put the name of the LaCie drive that
will not eject. In the example below, the drive is called
"LaCie". The listing underneath the word "COMMAND" shows the
program occupying the drive.