Eject Disk Without Restarting Mac OS X
Usually, we use the following methods to eject a disk on Mac OS X.
Trash it
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Drag and drop the disk icon to “Trash” on Dock.
F12 key

This is simplest. Press and hold the “F12″ key on your keyboard. It is a Mac OS X keyboard shortcut to eject disk.
Note: You may need to press down “fn” (function) key as well.
However, if the disk is stuck then the above methods may not work, you may need to try the following less known tricks to eject stuck disk on Mac OS X.
Disk Utility

Disk Utility is very useful disk monitoring application that comes with Mac OS X. It can be found in “Utilities” folder under “Applications”.

To eject disk, click on the disk which is listed on left sidebar, then click the “Eject” icon on toolbar to eject the disk.
Terminal

Mac OS X core is based on UNIX, therefore, you also get the powerful command line based Terminal in “Utilities” folder. Here is the command to eject a disk from Mac drive:
drutil tray eject

The disk will be ejected after you pressed “enter” key.
My two cents
Yes, there are other methods to eject Mac OS X disk but they required to restart Mac (e.g. hold down mouse button at startup), which is not good if you are still running some other applications.
Do you still have other tricks to eject disk without restarting Mac OS X? Share with us!
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June 27th, 2006 at 6:58 pm
Disks will only usually be ‘unejectable’ in OS X if they are in use by other Applications. Simply ‘Force Quit’ (on the Apple menu) all applications that are using the disk, and then the disk should be ejectable.
August 9th, 2006 at 3:28 am
Help! I have new Mac Intel iMac. When I insert a disk its icon does not appear on desktop.
Any suggestions?
Thanks!
Jeff
August 16th, 2006 at 2:26 am
@Jeff: maybe the disk can’t be read by OS X.