Updated: 10/07/2019 by Computer Hope

Eject may refer to any of the following:

CD-ROM eject button

1. In reference to removable disk drives, eject means to disengage the medium (removable disk) so it can be removed. For instance, with a CD-ROM drive, ejecting the disk will open the tray. Or, if the CD-ROM drive uses slot insertion, ejecting will mechanically reposition the CD so it sticks out of the slot.

The picture is a close-up example of what the eject button looks like on the front of a CD-ROM drive. It is usually represented by a small triangle with a line under it and is located on the right side of the drive.


Many software programs allow users to eject a CD without having to push the eject button.

Eject USB thumb drive in Windows

2. With USB drives, eject is an operating system feature that lets the operating system known the drive is about to be disconnected. The operating system will complete any read or write operations on the drive, and unmount it from the computer.

If you do not eject a USB drive before disconnecting it, there is a chance that data on the drive will be corrupted, because the operating system was not expecting it to be disconnected. For this reason, it's best to always eject your USB drive before physically disconnecting it from your USB port.

3. With Linux and Unix, eject is a command to eject removable media using the command line. See our eject command page for further information about this command.

CD terms, Hardware terms, Unmount