Mac os x disconnect usb device
Any external volume connected to your Mac shows up on your desktop. Right-click the volume and choose Eject "volume name.
Mount & Unmount Drives from the Command Line in Mac OS X
You can drag the desktop icon for an external volume and drop it on the trash can in the Dock. The trash can turns into a giant eject button when you start dragging the volume across the desktop to show that you aren't trashing its contents but merely ejecting the volume from your Mac.
An external volume connected to your Mac also shows up on the Finder sidebar under the Devices header.
If you are already using Finder and want to eject an external volume, just click the little eject button next to the volume listed on the sidebar. With the volume selected, you can also use the keyboard shortcut Command-E to eject it.
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I need this device to be used in a Ubuntu Virtual Machine so I need to be able to "disconnect" this device from the host mac os and open in the VM.
5 ways to eject an external drive from a Mac - CNET
I was something very much simple and stupid. You just need to add the device at the list of devices in the VM settings and you're good to go. Sorry for this late reply, btw.
Thanks a bunch. You should be able to unmount a device on OSX with the umount command: Preston Preston 2, 1 12 Thanks for your reply, but how can I unmount a device that is not listed? I don't understand what you mean by "not listed".