Have you checked that your user belongs to the appropriate groups, like usb, cdrom, cdrw, plugdev ?
- [gentoo-amd64] Unable to mount USB and CD on Gnome Clemente Aguiar
- Re: [gentoo-amd64] Unable to mount USB and CD on Gnom... Clemente Aguiar
- Re: [gentoo-amd64] Unable to mount USB and CD on Gnom... Thanasis
- Re: [gentoo-amd64] Unable to mount USB and CD on Gnom... Drake Donahue
- Re: [gentoo-amd64] Unable to mount USB and CD on ... Blackdream W