Safely remove a USB key

[stalagtite]

Hello,
I have a VU+ SOLO VTI, How can I safely remove a USB Key?

 

[Eragon]

VTI

Hi, this community is about the Black Hole image.
There is a section for other images:
http://www.vuplus-community.net/board/forums/vu-other-unofficial-images.11/
but for VTi info is better to ask on their own board.