I can not unmount a device, it says the device is busy, what can I try?

Updated -

When attempting to unmount a device, an error is returned stating the device is unable to be unmounted and returns the message that the device is busy.

# unmount /mnt/cdrom
unmount: /mnt/cdrom device is busy

This is usually because a process is still using a resource on the mounted device.

Red Hat Enterprise Linux ships with an utility named lsof

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